www.archive-org-2014.com » NET » V » VACUUMTUBES

Choose link from "Titles, links and description words view":

Or switch to "Titles and links view".

    Archived pages: 72 . Archive date: 2014-10.

  • Title: Over 8000 different Vacuum Tubes!
    Descriptive info: .. Prices.. Help.. Order.. Wanted.. Contact.. Mission.. FAQ.. How Vacuum Tubes Work.. Home.. Price Lists.. Help Center.. Order Forms.. Shipping Policy.. Our Mission.. How Tubes Work.. For over 35 years, Radio Electric Supply has supplied the world with radio and vacuum tubes for every possible application.. We still offer the worlds greatest selection.. We provide service, prices, and integrity that are unmatched anywhere.. ©2003 - 2005.. All rights reserved.. Radio Electric Supply, Vacuum Tubes Div.. Welcome to the Vacuum Tubes division of Radio Electric Supply, home of the largest supply of New Old Stock vacuum tubes in the world.. We now have a working inventory of over 7,800.. different.. radio tubes, amplifier tubes, and industrial vacuum tubes.. in stock.. Looking for audio tubes??.. Click here to see our inventory of thousands of tubes.. Need 10,000 pcs or more of one tube? We have them in stock!!!.. Tubes as low as 35 cents each.. hundreds to choose from.. Check them out here.. Quantity Specials.. We have an inventory of.. over 12 million tubes in stock!.. No, that is not a misprint.. We actually have Twelve Million vacuum tubes in our inventory.. So you can stop wandering around the Internet! We are the only tube supplier you will ever need.. Even our competitors buy from us, especially those hard to find tubes.. We have them all,.. , and we have them at the best prices! Try us! Give us a call today at 1-800-326-4140 and find out for yourself why  ...   supply radio vacuum tubes for:.. Amateur Radio.. Industrial Equipment.. Amplifiers of all kinds.. Sound Equipment.. Transmitters.. Antique Radio.. Electronic Organs.. CB Radios.. Audiophile Applications.. Ham Radio and more!.. We also have a large supply of used vacuum tubes in stock.. We stock radio and vacuum tubes for every application from all major manufacturers including RCA, GE, Sylvania, Raytheon, Tungsol, and Amperex.. If you are looking for a hard to find vacuum tube, we can nearly guarantee that it is in our inventory and available today!.. As for.. pricing.. ? We offer the best pricing in the industry.. We buy and sell in quantities that allow us to offer the best deal AND the best service.. We stand behind every tube we ship.. We own and operate Radio Electric Supply.. We ship our tubes worldwide, and we promise total customer satisfaction.. You have our word on it.. That is our.. mission.. !.. List1.. List2.. List3.. List 4.. List5.. List6.. List7.. Roy and Dale Rogalski.. Radio Electric Supply.. Every tube is hand tested before it is shipped to the customer.. We guarantee every tube we sell for thirty days except for breakage, open filaments or operation outside manufacturer s specifications.. For over 35 years our customers throughout the world have looked to us for performance, support, and integrity.. At Radio Electric Supply, you can expect service, prompt delivery, and great customer support every day.. Web Design and Marketing by.. Black Coral.. -.. For questions, bug reports or problems contact the.. webmaster..

    Original link path: /
    Open archive

  • Title: Vacuum Tubes prices. Best prices every day!
    Descriptive info: For over 35 years, Radio Electric Supply has supplied the world with electron tubes for every application.. We still offer the worlds greatest selection, unparalleled service and integrity unmatched anywhere.. We Stock over 7,800 different radio and and vacuum tubes.. This is the largest stock anywhere in the world and is continually growing.. In order to meet our customers needs, we are currently buying over two million New Old Stock tubes every year.. Our prices are the lowest on the web and we are always looking for more great deals to pass on to our customers.. If the tube you need is  ...   Tubes 01A through 3Z4.. Tubes 4-65A through 6BZ8.. Tubes 6C through 6LY8.. Tubes 6M3 through 11Y9.. Tubes 12A through 29LE3.. Tubes 30 through 698.. Tubes 701A-WE to 5998A.. Tubes 6000 through 7199.. Tubes 7200 through 10105376.. Tubes A0897 through EZ9.. Tubes F123A through QV04-7.. Tubes R1-1005 through ZZ1040.. Ballasts.. Relays, Sockets and other misc items.. Every tube is double tested.. by hand.. prior to shipment.. We guarantee every vacuum tube we sell for thirty days.. This.. excludes.. breakage, open filaments or tube operation outside manufacturer s specifications.. *Vacuum Tube must be.. from a reputable tube reseller.. Web Design and Hosting by.. TicoSites.. com..

    Original link path: /prices.htm
    Open archive

  • Title: Vacuum Tubes needed? We have 5,000 in stock.
    Descriptive info: VacuumTubes.. Net.. A division of Radio Electric Supply.. Need Help?.. Here is Where you get it!.. Availability, price, Sales Policies.. Sales Dept.. sales@vacuumtubes.. Q.. uality control, tube testing procedures,, etc.. Service Dept.. service@vacuumtubes.. If you have tubes to sell and wish to discuss them with our buyer.. Tube Purchasing Group.. tubes.. @vacuumtubes.. Find out where and how your order was shipped or its status.. Shipping.. support@vacuumtubes.. Or you can always call us! 800-326-4140.. We guarantee every tube we sell for thirty days except for breakage, open filaments or operation outside manufacturer's specifications..

    Original link path: /helpcenter.htm
    Open archive
  •  

  • Title: Vacuum Tubes needed? 5,000 vaccuum tubes in stock.
    Descriptive info: Contact VacuumTubes.. Vacuum Tubes Division.. 20323 North Hwy 121.. PO Box 433.. La Crosse, FL 32658.. Toll Free Order Line.. 800-326-4140.. (US and Canada).. 386-462-4646 Orders or General Information.. 386-462-5656 FAX.. Sales Questions.. Service: Inquire about quality control, tube testing procedures, or our return policy.. Buy List: If you have tubes to sell and wish to discuss them with our buyer.. Shipping: Find out where and how your order was shipped.. Web Design by.. Black Coral Design.. For questions, bug reports or problems contact the..

    Original link path: /contact.htm
    Open archive

  • Title: We Buy Vacuum Tubes Every Day
    Descriptive info: Our Mission and Policies.. Welcome!.. Dale Roy Rogalski would like to thank you for stopping by our web site.. Our mission is to provide superior product at superior prices using superior policies for our superior customers.. Simple! We try to treat our customers as we would want to be treated.. We offer quality vacuum tubes from all quality manufacturers at great prices.. Each vacuum tube is checked for electrical integrity before shipping.. Look to the right and see how we do it.. We stock over 7,800.. vacuum tubes every day.. We have a working inventory of over 12 Million tubes on hand! That is NOT a misprint.. We actually STOCK Twelve Million Vacuum Tubes in our warehouse.. Whether you are looking for an amplifier tube  ...   than 24 hours.. If you have any questions about vacuum tube specifications or any other tube related question, feel free to.. E-mail.. one of our customer service representatives from the Help Center.. New stock is added daily, so return often if you do not see the tube you are looking for.. We will not be undersold.. We will meet or beat any price at any time from any reliable competitor.. Enjoy your visit, and thank you for doing business with Radio Electric Supply, Vacuum Tubes Div.. We will try to earn your business every day.. To order vacuum tubes, go directly to our.. Order Form.. Prefer to call? Toll Free 800-326-4140.. Yes, we also.. buy vacuum tubes.. every day! We are always buying for inventory..

    Original link path: /mission.htm
    Open archive

  • Title: Vacuum Tubes Frequently Asked Questions
    Descriptive info: Over TEN MILLION tubes.. Frequently Asked Questions:.. Here is where you get the answers about buying vacuum tubes, radio tubes, and learn about the terminology we use in this business.. We stock and sell more radio and vacuum tubes than any other company in the world.. See an answer we missed? Write us.. here.. Click the question to get the answer!.. Am I safe to buy an equivalent or substitute vacuum tube? Are they exactly the same?.. Is it OK to buy a 30 year old radio tube? Don t they lose their vacuum or anything?.. What is the difference between NOS and NIB? Aren t they the same thing?.. Will you ever run out of a radio or vacuum tube I need?.. What is the difference between a G tube and a GT? Can I use them interchangeably?.. Are prices going up as NOS tube supply gets smaller?.. Do I need to buy a socket and do you sell them?.. I found the same tube at one of your competitors.. I prefer to buy from you because I have used you before.. Will you match or beat their price?.. Are vacuum tubes made in China or Russia safe to buy?.. Doesn t everybody use transistors today?.. What are your hours? I don t see them anywhere on your website?.. Don t the companies today make the old model vacuum tubes?.. How do you test vacuum tubes?.. What tester do you use?.. Glass tubes are fragile right? How do you pack them so they don t break?.. I need a vacuum tube that is not listed on your website.. Can you help me locate it or a compatible substitute?.. Why do some tubes have two different types of numbers on them? For instance I have a 12AU7A that also has ECC82 printed on the tube.. Am I safe to buy an equivalent or substitute tube? Are they exactly the same?.. Normally equivalent vacuum tubes such as a 6J5 or 6J5GT or 6J5G are electronically the same.. They may have a different construction, i.. e.. metal versus glass, or a different glass shape.. They will perform the same.. Substitute vacuum tubes are not exactly the same electronically but will perform the same in most circuits.. We will not ship a substitute tube without first checking to see the application it is to be used in.. Is it OK to buy a 30 year old tube? Don t they lose their vacuum or anything?.. The beauty of a vacuum tube is that all the electronic components are sealed in a vacuum.. Unless something happens to the tube to cause it to lose it s vacuum, it will function as well today as when it was made decades ago.. Top.. The only real difference is the shape of the glass envelope.. Electronically they are the same and can be used interchangeably with no  ...   carry a wide variety of new and used sockets, and we are more than happy to point you in the right direction if there is a socket that we cannot supply.. Our philosophy is to have the lowest price of any of the major tube suppliers.. We will match prices with anyone who.. actually has that tube in stock at that price.. Because of the volatile nature of some tube prices it is common to find a price on someone s web page but they do not have that tube in stock, and may not have for some time.. Rest assured that when they get another one for sale it will be priced in line with the current market.. Are tubes made in China or Russia safe to buy?.. Yes, very much so.. Some excellent vacuum tubes are being made in China and Russia today.. We stock only those tubes we know to be reliable.. No.. Many applications perform better with vacuum tubes.. High end audio systems are exclusively vacuum tube based.. In many cases it is cheaper for a corporation to re-tube existing equipment than to purchase all new transistorized equipment.. You may place your order 24 hours a day by email or on this website.. If you prefer to to talk to us on the phone we can be reached M - F between 8:30 am and 4:30 pm Eastern time.. It is also possible to catch us in the evening if we are working late.. If we are here, we answer the phone.. When the majority of electronics went to transistors, the tube manufacturers found that is was no longer economically feasible to maintain expensive tube producing facilities.. We have a number of tube testers that check mutual conductance, shorts, gas, and grid leakage.. Normally a vacuum tube that passes these tests will function perfectly in your equipment.. Every tube is tested before it is shipped and we guarantee them for 30 days.. We have 14 different testers including a pair of Hickok 118B cardmatics that have been converted to a computerized database.. Although tubes are made of glass, they are remarkably resilient.. We pack every box with utmost care to insure that your tubes arrive to you intact.. No problem.. We are always willing to help locate tubes for a customer.. Chances are that we probably have it in stock anyway.. There are several different numbering systems for tubes and you may be searching under the wrong number.. Or it could be a tube that we have in stock, but have not yet inventoried for our list.. The ECC82 is the European numbering system and the 12AU7A is the US system.. There a quite a few tubes that have both numbers printed on them, but many will only have one or the other number.. They are the same tube, no matter what numbering system is used.. (Dale)..

    Original link path: /faq.htm
    Open archive

  • Title: How Vacuum Tubes Work
    Descriptive info: This Page is a courtesy of.. www.. vacuumtubes.. We carry over 7,800 different vacuum tubes, in Stock!.. 12 Million tubes on hand every day!.. Click here to order virtually any vacuum tube you might need.. by Eric Barbour.. [The Basics].. [Inside a Tube].. [Why are Tubes Still Used] -.. [Using Tubes].. The BASICS.. Back in 1904, British scientist John Ambrose Fleming first showed his device to convert an alternating current signal into direct current.. The Fleming diode was based on an effect that Thomas Edison had first discovered in 1880, and had not put to useful work at the time.. This diode essentially consisted of an incandescent light bulb with an extra electrode inside.. When the bulb's filament is heated white-hot, electrons are boiled off its surface and into the vacuum inside the bulb.. If the extra electrode (also called an plate or anode ) is made more positive than the hot filament, a direct current flows through the vacuum.. And since the extra electrode is cold and the filament is hot, this current can only flow from the filament to the electrode, not the other way.. So, AC signals can be converted into DC.. Fleming's diode was first used as a sensitive detector of the weak signals produced by the new wireless telegraph.. Later (and to this day), the diode vacuum tube was used to convert AC into DC in power supplies for electronic equipment.. Many other inventors tried to improve the Fleming diode, most without success.. The only one who succeeded was New York inventor Lee de Forest.. In 1907 he patented a bulb with the same contents as the Fleming diode, except for an added electrode.. This grid was a bent wire between the plate and filament.. de Forest discovered that if he applied the signal from the wireless-telegraph antenna to the grid instead of the filament, he could obtain a much more sensitive detector of the signal.. In fact, the grid was changing ( modulating ) the current flowing from the filament to the plate.. This device, the Audion, was the first successful electronic amplifier.. It was the genesis of today's huge electronics industry.. Between 1907 and the 1960s, a staggering array of different tube families was developed, most derived from de Forest's invention.. With a very few exceptions, most of the tube types in use today were developed in the 1950s or 1960s.. One obvious exception is the 300B triode, which was first introduced by Western Electric in 1935.. Svetlana's SV300B version, plus many other brands, continue to be very popular with audiophiles around the world.. Various tubes were developed for radio, television, RF power, radar, computers, and specialized applications.. The vast majority of these tubes have been replaced by semiconductors, leaving only a few types in regular manufacture and use.. Before we discuss these remaining applications, let's talk about the structure of modern tubes.. Back to Top.. INSIDE A TUBE.. All modern vacuum tubes are based on the concept of the Audion--a heated cathode boils off electrons into a vacuum; they pass through a grid (or many grids), which control the electron current; the electrons then strike the anode (plate) and are absorbed.. By designing the cathode, grid(s) and plate properly, the tube will make a small AC signal voltage into a larger AC voltage, thus amplifying it.. (By comparison, today's transistor makes use of electric fields in a crystal which has been specially processed--a much less obvious kind of amplifier, though much more important in today's world.. ).. Figure 3 (Inside a miniature tube) shows a typical modern vacuum tube.. It is a glass bulb with wires passing through its bottom, and connecting to the various electrodes inside.. Before the bulb is sealed, a powerful vacuum pump sucks all the air and gases out.. This requires special pumps which can make very hard vacuums.. To make a good tube, the pump must make a vacuum with no more than a millionth of the air pressure at sea level (one microTorr, in official technical jargon).. The harder the vacuum, the better the tube will work and the longer it will last.. Making an extremely hard vacuum in a tube is a lengthy process, so most modern tubes compromise at a level of vacuum that is adequate for the tube's application.. First, let's talk about the parts of the tube.. A.. Cathode.. Today, nearly all tubes use one of two different kinds of cathode to generate electrons.. 1) The thoriated filament: it is just a tungsten filament, much like that in a light bulb, except that a tiny amount of the rare metal THORIUM was added to the tungsten.. When the filament is heated white-hot (about 2400 degrees Celsius), the thorium moves to the outer surface of it and emits electrons.. The filament with thorium is a much better maker of electrons than the plain tungsten filament by itself.. Nearly all big power tubes used in radio transmitters use thoriated filaments, as do some glass tubes used in hi-fi amps.. The thoriated filament can last a VERY long time, and is very resistant to high voltages.. 2) The other kind of cathode is the oxide-coated cathode or filament.. This can be either just a filament coated with a mixture of barium and strontium oxides and other substances, or it can be an indirectly heated cathode, which is just a nickel tube with a coating of these same oxides on its outer surface and a heating filament inside.. The cathode (and oxide coating) is heated orange-hot, not as hot as the thoriated filament--about 1000 degrees Celsius.. These oxides are even better at making electrons than the thoriated filament.. Because the oxide cathode is so efficient, it is used in nearly all smaller glass tubes.. It can be damaged by very high voltages and bombardment by stray oxygen ions in the tube, however, so it is rarely used in really big power tubes.. 3) Lifetime of cathodes: The lifetime of a tube is determined by the lifetime of its cathode emission.. And the life of the of a cathode is dependent on the cathode temperature, the degree of vacuum in the tube, and purity of the materials in the cathode.. Tube life is sharply dependent on temperature, which means that it is dependent on filament or heater operating voltage.. Operate the heater/filament too hot, and the tube will give a shortened life.. Operate it too cool and life may be shortened (especially in thoriated filaments, which depend on replenishment of thorium by diffusion from within the filament wire).. A few researchers have observed that the lifetime of an oxide-cathode tube can be greatly increased by operating its heater at 20% below the rated voltage.. This USUALLY has very little effect on the cathode's electron emission, and might be worth experimenting with if the user wishes to increase the lifetime of a small-signal tube.. (Low heater voltage is NOT recommended for power tubes, as the tube may not give the rated power output.. ) Operating the heater at a very low voltage has been observed to linearize some tube types-- we have not been able to verify this, so it may be another worthy experiment for an OEM or sophisticated experimenter.. The average end-user is advised to use the rated heater or filament voltage--experimentation is not recommended unless the user is an experienced technician.. Oxide cathodes tend to give shorter lifetimes than thoriated filaments.. Purity of materials is a big issue in making long-lived oxide cathodes--some impurities, such as silicates in the nickel tube, will cause the cathode to lose emission prematurely and wear out.. Low-cost tubes of inferior quality often wear out faster than better-quality tubes of the same type, due to impure cathodes.. Small-signal tubes almost always use oxide cathodes.. Good-quality tubes of this type, if operated well within their ratings and at the correct heater voltage, can last 100,000 hours or more.. The world record for lifetime of a power tube is held by a large transmitting tetrode with a thoriated filament.. It was in service in a Los Angeles radio station's transmitter for 10 years, for a total of more than 80,000 hours.. When finally taken out of service, it was still functioning adequately.. (The station saved it as a spare.. ) By comparison, a typical oxide-cathode glass power tube, such as an EL34, will last about 1500-2000 hours; and a tube with an oxide-coated filament, such as an SV300B, will last about 4000-10,000 hours.. This is dependent on all the factors listed above, so different customers will observe different lifetimes.. B.. Plate (anode).. The plate, or anode, is the electrode that the output signal appears on.. Because the plate has to accept the electron flow, it can get hot.. Especially in power tubes.. So it is specially designed to cool itself off, either by radiating heat through the glass envelope (if it's a glass tube), or by forced-air or liquid cooling (in bigger metal-ceramic tubes).. Some tubes use a plate made of graphite, because it tolerates high temperatures and because it emits very few secondary electrons, which can overheat the tube's grid and cause failure.. See H--the getter below for more about the graphite plate.. C.. Control Grid.. In nearly all glass audio tubes, the control grid is a piece of plated wire, wound around two soft-metal posts.. In small tubes the plating is usually gold, and there are two posts made of soft copper.. Grids in big power tubes have to tolerate a lot of heat, so they are often made of tungsten or molybdenum wire welded into a basket form.. Some large power tubes use basket-shaped grids made of graphite (see D below).. Inside any modern amplifying tube, one of the things to avoid is called secondary emission.. This is caused by electrons striking a smooth metal surface.. If many secondary electrons come out of the grid, it will lose control of the electron stream, so that the current runs away , and the tube destroys itself.. So, the grid is often plated with a metal that is less prone to secondary emission, such as gold.. Special surface finishing is also used to help prevent secondary emission.. A tube with only one grid is a TRIODE.. The most widely used small triode, the 12AX7, is a dual triode which has become the standard small-signal amplifier in guitar amps.. Other small glass triodes used in audio equipment include the 6N1P, 6DJ8/6922, 12AT7, 12AU7, 6CG7, 12BH7, 6SN7 and 6SL7.. Many glass power triodes are currently on the market, most of them aimed at amateur radio or high-end audio use.. Typical examples are the Svetlana SV300B, SV811/572 series, and 572B.. Power triodes come in low-mu (low gain) and high-mu (high gain) versions.. Low-mu triodes like the SV300B have very low distortion and are used in high-end audio amplifiers, while high-mu triodes are used mostly in radio transmitters and big high-power audio amplifiers.. Large ceramic-metal power triodes are often used in radio transmitters and to generate radio energy for industrial heating applications.. Specialized triodes of many kinds are made for exotic applications, such as pulsed radars and high-energy physics work.. D.. Screen grid--the tetrode.. Adding another grid to a triode, between the control grid and the plate, makes it into a TETRODE.. This screen grid helps screen, or isolate, the control grid from the plate.. This is important is reducing the so-called Miller effect, which makes the capacitance between the grid and plate look much bigger than it really is.. The screen also causes an electron-accelerating effect, increasing the tube's gain dramatically.. The screen grid in a power tube carries some current, which causes it to heat up.. For this reason, screen grids are usually coated with graphite, to reduce secondary emission and help keep the control grid cool.. Many large radio and TV stations use giant metal-ceramic power tetrodes, which are capable of high efficiency when used as RF power amplifiers.. Power tetrodes are also sometimes used in amateur radio and industrial applications.. (Regular tetrodes are rarely used for audio applications because of an effect called tetrode kink , caused by that secondary emission.. Most of it is due to electrons bouncing off the plate, some from the screen.. ) This greatly increases distortion and can cause instability if not carefully dealt with in the design.. See section F, audio beam tetrodes , below.. ).. Large ceramic tetrodes are often called radial beam tetrodes or simply beam tetrodes , because their electron emission forms a disc-shaped beam.. The wires on their control and screen grids are aligned, a special trick which improves efficiency.. E.. Other grids--the pentode.. By adding a third grid to the tetrode, we get a PENTODE.. The third grid is called a suppressor grid and is inserted between the plate and the screen grid.. It has very few wire turns, since its only job is to collect the stray secondary-emission electrons that bounce off the plate, and thereby eliminate the tetrode kink.. It is usually operated at the same voltage as the cathode.. Tetrodes and pentodes tend to have higher distortion than triodes, unless special circuit designs are used (see ULTRALINEAR, below).. The EL34, EL84, SV83 and EF86 are true pentodes.. The EL34 is widely used in guitar and high-end amplifiers as the power output tube.. The smaller EL84 is seen in lower-cost guitar amps.. The SV83 is used in a few high-end and guitar amps, while the EF86 is used as a low-noise preamp in guitar amps and professional audio equipment.. One of the few large high-power pentodes is the 5CX1500B, often seen in radio transmitters.. There were tubes with more than three grids.. The pentagrid converter tube, which had five grids, was widely used as the front-end frequency converter in radio receivers.. Such tubes are no longer in production, having been fully replaced by semiconductors.. F.. Audio Beam Tetrode.. This is a special kind of beam tetrode, with a pair of beam plates to constrain the electron beam to a narrow ribbon on either side of the cathode.. Also, the control and screen grids have their wire turns aligned, much like the large ceramic tetrodes (above).. Unlike the ceramic  ...   I replaced the tubes, the old tubes ran at 35 mA, the new ones run at 38 mA.. I'm worried that I have to rebias the amp.. This is NOT worth worrying about.. Especially with guitar amps--they tend to run their tubes at idle conditions which are conservative.. Some high-end audio amps run their power tubes quite hard--in that case, rebiasing is necessary.. Many amps have no bias adjustments at all, and are designed so that you do not need to concern yourself with bias.. This includes most Mesa-Boogie guitar amps, most amps using EL84s, and many single-ended triode hi-fi amps.. See our.. Technical Bulletin #7.. for more information on biasing guitar amps.. We suggest that users consult with the equipment manufacturer, if possible.. When should I replace the tubes?.. Practically speaking, you should only replace tubes in an audio amplifier when you start to notice changes in the sound quality.. Usually the tone will become dull , and transients will seem to be blunted.. Also, the gain of the amplifier will decrease noticeably.. This is usually enough of a warning for tube replacement.. If the user has very stringent requirements for observing tube weakening, the best way to check tubes is with a proper mutual- conductance-style tube tester.. These are still available on the used market; though new ones have not been manufactured in many years.. One tester is being manufactured today, the Maxi-Matcher.. It is suitable for testing 6L6, EL34, 6550 and EL84 types.. If you cannot get your own tube tester, speak to a service technician for his recommendations.. See our cathode section 2A above for some idea of typical lifetimes for tubes.. Large ceramic power tubes are usually operated in equipment that has metering of the plate current or power output.. When the tube cannot reach the rated plate current or power output for the equipment, the tube is usually considered to be at the end of its normal life.. The operating manual should give a more complete procedure for estimating the health of the tube.. Blue Glow -- what causes it?.. Glass tubes have visible glow inside them.. Most audio types use oxide-coated cathodes, which glow a cheery warm orange color.. And thoriated-filament tubes, such as the SV811 and SV572 triodes, show both a white-hot glow from their filaments and (in some amplifiers) a slight orange glow from their plates.. All of these are normal effects.. Some newcomers to the tube-audio world have also noticed that some of their tubes emit a bluish-colored glow.. There are TWO causes for this glow in audio power tubes; one of them is normal and harmless, the other occurs only in a bad audio tube.. 1).. Most Svetlana glass power tubes show FLUORESCENCE GLOW.. This is a very deep blue color.. It can appear wherever the electrons from the cathode can strike a solid object.. It is caused by minor impurities, such as cobalt, in the object.. The fast-moving electrons strike the impurity molecules, excite them, and produce photons of light of a characteristic color.. This is usually observed on the interior of the plate, on the surface of the mica spacers, or on the inside of the glass envelope.. THIS GLOW IS HARMLESS.. It is normal and does not indicate a tube failure.. Enjoy it.. Many people feel it improves the appearance of the tube while in operation.. 2).. Occasionally a tube will develop a small leak.. When air gets into the tube, AND when the high plate voltage is applied, the air molecules can ionize.. The glow of ionized air is quite different from the fluorescence glow above--ionized air is a strong purple color, almost pink.. This color usually appears INSIDE the plate of the tube (though not always).. It does not cling to surfaces, like fluorescence, but appears in the spaces BETWEEN elements.. A tube showing this glow should be replaced right away, since the gas can cause the plate current to run away and (possibly) damage the amplifier.. PLEASE NOTE: some older hi-fi and guitar amplifiers, and a very few modern amplifiers, use special tubes that DEPEND on ionized gas for their normal operation.. -Some amps use mercury vapor rectifiers, such as types 83, 816, 866 or 872.. These tubes glow a strong blue-purple color in normal use.. They turn AC power into DC to run the other tubes.. -And occasionally, vintage and modern amplifiers use gas-discharge regulator tubes, such as types 0A2, 0B2, 0C2, 0A3, 0B3, 0C3 or 0D3.. These tubes rely on ionized gas to control a voltage tightly, and normally glow either blue-purple or pink when in normal operation.. If you are unsure if these special tubes are used in your amplifier, consult with an experienced technican before replacing them.. ALSO NOTE: these light sources cannot be seen in metal-ceramic tubes, because their parts are opaque.. As we said above, it is difficult to tell if a ceramic tube has become gassy.. Usually, in a large radio transmitter, a gassy tube will arc over internally.. (This does not damage the transmitter.. It has protective circuits.. ) The equipment operating manual should give more information on this.. What is Class A, B, AB, ultralinear, etc?.. 1.. Class A.. means that the power tube conducts the same amount of current all the time, whether idling or producing full power.. Class A is very inefficient with electricity but usually gives very low distortion.. There are single-ended class-A, or SE, amplifiers.. They use one or more tubes in parallel, which are all in phase with each other.. This is commonly used in smaller guitar amps and in exotic high-end amplifiers.. Many audiophiles prefer the SE amplifier, even though it has relatively high levels of even-order distortion.. Most 300B high-end amplifiers are SE.. Negative feedback, which can be used to decrease the distortion of an amplifier, is felt by some people to sound inferior.. Most SE amps have no feedback.. Push-pull class-A amplifiers also exist--they use two, four or more tubes (always in pairs) which are driven in opposite phase to each other.. This cancels out the even-order distortion and gives very clean sound.. An example of a class-A push-pull amplifier is the Vox AC-30 guitar amp.. Push-pull Class A operation usually involves low plate voltages and high plate currents, compared to Class AB operation below.. The high currents might tend to wear out the tube cathodes faster than in an AB amplifier.. There are two kinds of class-A operation, which can apply to single-ended or push-pull.. --.. Class A1.. means that the grid voltage is always more negative than the cathode voltage.. This gives the greatest possible linearity and is used with triodes such as the SV300B, and with audio beam tetrodes and pentodes.. Class A2.. means that the grid is driven MORE POSITIVE than the cathode for part or all of the waveform.. This means the grid will draw current from the cathode and heat up.. A2 is not often used with beam tetrodes, pentodes or triodes like the SV300B, especially in audio.. Usually a class-A2 amplifier will use tubes with special rugged grids, such as the SV811 and SV572 series of triodes.. Class A2 also requires a special driver circuit, that can supply power to the grid.. 2.. Class AB.. applies only to push-pull amplifiers.. It means that when one tube's grid is driven until its plate current cuts off (stops) completely, the other tube takes over and handles the power output.. This gives greater efficiency than Class A.. It also results in increased distortion, unless the amplifier is carefully designed and uses some negative feedback.. There are class-AB1 and class-AB2 amplifiers; the differences are the same as were explained above--the tube's grids are not (AB1) or are (AB2) driven positive.. 3.. Class B.. applies only to push-pull amplifiers in audio; it SOMETIMES applies to RF power amplifiers with one tube.. It is like Class AB, except that the tubes idle at or near zero current.. This gives even greater efficiency than Class A or AB.. If careful design is not undertaken, the result may be crossover distortion, which appears at the midpoint of the output waveform and has very bad-sounding effects in audio.. Most solid-state audio amplifiers use class B, because the transistors undergo less heat stress when idling.. 4.. Ultralinear.. operation was invented by David Hafler and Herbert Keroes in 1951.. It uses only beam tetrodes or pentodes, and special taps on the output transformer.. The taps connect to the screen grids of the tubes, causing the screens to be driven with part of the output signal.. This lowers distortion considerably.. It is usually seen only in hi-fi amplifiers that use power tubes such as the SV6L6GC, SV6550C, EL84 or EL34.. Why are different kinds of power supplies used in various tube amplifiers? Why do some use tube amplifiers? Why do some use tube rectifiers, while others use solid-state rectifiers, while still others have electronic regulation?.. Tube rectifiers are still used in power supplies of some guitar amps, because the current a tube rectifier can produce varies somewhat with the load.. It is quite different in response from a solid-state rectifier.. Many audiophiles also prefer this classic design for much the same reasons.. Also, inexpensive solid-state rectifiers can put hash into a power supply, because of their slow transient capability while charging and recharging a filter capacitor 50/60 times a second.. Special high-speed silicon rectifiers are available at high cost.. They are rarely used in products other than a few high-end amplifiers.. Tube rectifiers have faster transient response than most solid-state rectifiers, also making them useful in some high-end designs.. Regulated DC plate power can be very helpful in a push-pull Class AB amplifier.. Because the amp draws greatly different current when at idle and when delivering full power, a regulated supply sags less at full power, producing better transient response in the amplifier.. It is expensive to regulate the high voltages in a tube amplifier, so it is done only in expensive top-line models.. Class A amplifiers have less need for regulation since they draw nearly the same DC power at all times.. It is dependent on the circuit design.. The only way to see if you need an amplifier with a regulated supply is to listen to it and carefully compare it with similar amps with unregulated supplies.. Regulation is almost never used in guitar amps, since the DC power sag causes some signal compression, which is considered part of the desired sound effect inherent to a guitar amp.. What are the advantages of an OTL amplifier over a conventional one with an output transformer? Should I get an OTL? What about its reliability issues?.. OTL, or output-transformerless, amplifiers are special high-end products.. Because it is expensive and difficult to wind an output transformer for a tube amplifier to achieve the best possible performance, some designers have chosen to eliminate the transformer altogether.. Unfortunately, tubes have relatively high output impedances compared to transistors.. So, tubes with large cathodes and high peak emission capability are used---in many push-pull pairs.. A well-designed OTL is capable of the best audio performance available today.. OTLs usually require more maintenance and greater care in use than transformer-coupled amps.. In recent years, OTLs have gotten a bad reputation for unreliability.. This was only a problem with some low-cost manufacturers, who have since gone out of business.. A well-designed OTL can be just as reliable as a transformer-coupled amp.. There's all this talk about parallel feed , shunt feed , SRPP, mu followers , and the like.. Which should I use? What's the difference?.. Parallel feed and shunt feed are the same technique.. Basically, a choke is used to load the power tube (usually one, in SE mode), while the output transformer is coupled to the plate of the tube through a capacitor.. So, the plate current of the tube does not flow through the output transformer.. This can be a very expensive technique to implement, since the choke must be as carefully wound as the output transformer.. It does offer a possible performance improvement.. You should try to audition a parallel-feed high-end amp before buying it.. This technique is considered too expensive for use in guitar amps.. SRPP circuits and mu-follower circuits are special designs which use a lower tube (for gain), and an upper tube which serves as the plate load for the lower tube.. The upper tube also acts as both a cathode follower and as a constant-current source for the lower tube.. If properly designed, either circuit can offer improved performance over an ordinary resistor-loaded tube stage.. These circuits are used only in preamp stages and in the driver stages of power amps, usually SE types, in high-end audio.. If you want to build your own, see Technical Bulletin 27 for a good-quality mu-follower circuit that can be used as a line stage preamp or a power-amp driver.. If you want to learn more of the technical details behind vacuum-tube electronic design, we recommend the following.. books.. We recommend two recently-published books on circuit design, which the novice can derive much information from:.. THE BEGINNER'S GUIDE TO TUBE AUDIO DESIGN.. , by Bruce Rozenblit (ISBN 1-882580-13-3);.. and.. PRINCIPLES OF POWER.. , by Kevin O'Connor (ISBN 0-9698-6081-1).. Classic textbooks on tube audio design which were recently reprinted are:.. THE RADIO DESIGNER'S HANDBOOK.. , by Langford-Smith (ISBN 1-7506-3635-1);.. FUNDAMENTALS OF RADIO-VALVE TECHNIQUE.. , by J.. Deketh (ISBN 1-8825-8023-0); and.. PRINCIPLES OF ELECTRON TUBES.. by Herbert Reich (ISBN 1-882580-07-9).. These books are more advanced and are not recommended for the novice.. They are available from Old Colony Sound Lab, Antique Electronic Supply or other book dealers.. -A web site with much technical information about vacuum tubes is.. http://cernan.. ecn.. purdue.. edu/~busenitz/vac.. -If you want to learn more about tube materials and processes, the American Institute of Physics currently publishes two classic books that are chock-full of advanced information:.. HANDBOOK OF MATERIALS AND TECHNIQUES FOR VACUUM DEVICES.. , by Walter Kohl (ISBN 1-56396-387-6); and.. HANDBOOK OF ELECTRON TUBE AND VACUUM TECHNIQUES.. , by Fred Rosebury (ISBN 1-56396-121-0).. All of the books are available from large book dealers and from some of our audio-tube Stocking Distributors.. © Svetlana..

    Original link path: /How_Vacuum_Tubes_Work.htm
    Open archive

  • Title: Audio tubes page
    Descriptive info: Audio Vacuum Tube List.. Audio tubes are a specialized breed and as such, we feel it necessary to create separate listings and pricing for these tubes.. Within these pages you will find not only vintage but modern production tubes aimed at the audio market.. All these tubes undergo more stringent testing and are hand picked for quality.. Since vintage production tubes are of limited quantity, there are times when we may be out of stock for a certain type.. But we are always purchasing new inventory.. So, if you don't see what you are  ...   5AR4.. 5U4.. 5V4.. 5Y3.. 6AS7.. 6B4G.. 6BM8.. 6BQ5.. 6CA4.. 6CA7.. 6CW5.. 6CG7.. 6DJ8.. 6F8G.. 6L6.. 6SL7.. 6SN7.. 6SU7.. 6V4.. 6V6.. 6X5.. 7DJ8.. 8BQ5.. 12AT7.. 12AU7.. 12AX7.. 12AY7.. 12AZ7.. 12SL7.. 12SN7.. 12SX7.. 12X4.. 45.. 50.. 71.. 5687.. 5691.. 5692.. 5751.. 5814.. 5881.. 5963.. 5965.. 5998.. 6087.. 6189.. 6201.. 6267.. 6350.. 6550.. 6919.. 6922.. 7025.. 7027.. 7119.. 7308.. 7316.. 7318.. 7408.. 7591A.. 7868.. 8417.. ECC32.. ECC33.. ECC35.. ECC81.. ECC82.. ECC83.. EL34.. EL84.. EZ80.. EF86.. GZ30.. GZ32.. GZ34.. GZ37.. KT66.. KT76.. KT77.. KT88.. KT90.. Back to.. all price lists.. Contact us.. Site by W.. D.. B.. 2010..

    Original link path: /RES%20Audio%20pages/audiopage.html
    Open archive

  • Title: Quantity Specials
    Descriptive info: Radio Electric Supply.. Quantity specials.. Back to home page.. Huge savings.. We are overstocked on these and are willing to let them go CHEAP.. You've never seen prices this low before.. Over 400 different tubes are available.. Hurry as these will go fast.. Once they are gone, there are no more.. Click on the links below to see  ...   get them for $0.. 75 each.. Order 100 or more of the same tube and they are only $0.. 50 each.. Order 500 or more of the same tube and they drop to $0.. 35 each.. 46 NEW TUBES ADDED ON MAY 7TH.. 1A3 thru 4HA5.. 4HA7 thru 6FM8.. 6FV6 thru 10DX8.. 10EB8 thru 20AQ3.. 22BH3 thru 50DC4..

    Original link path: /Quantity%20Specials/Quantity%20specials.htm
    Open archive

  • Title: Vacuum Tube Prices 0A1 thru 3Z4  Back to Price Lists
    Descriptive info: Vacuum Tube Prices 0A1 thru 3Z4.. Back to Price Lists.. SKU.. Tubes.. Price.. 01A.. 00.. 01B.. 01C.. 0A2.. 0A2, 150C4.. 0A2WA.. SEE 6626.. 0A3.. 0A3, VR75.. 5.. 0A3A.. 0A3W.. Call/Email.. 0A4G.. 0A4G, PL1267.. 17.. 0A5.. 7.. 0B2.. 0B2, 108C1.. 0B3.. 0B3, VR90.. 0B3A.. 0C2.. 0C3.. 0C3, VR105, 38205.. 0C3A.. 0C3W.. 0D3.. 0D3, VR150.. 0D3A.. 0D3W.. 0E3.. 0E3, 85A1.. 0G3.. 0G3, 85A2, STV85/10.. 0M7.. 0Y4.. 0Z4.. 0Z4, 1003.. 1-4DG.. 0Z4G.. 1A3.. 1A3, DA90.. 1A4.. 1A4P.. 1A4T.. 1A5G.. 12.. 1A5GT.. 1A6.. 1A7G.. 15.. 1A7GT.. 1AB5.. 1AB6.. 1AB6, DK96.. 10.. 1AC5.. 1AC6.. 1AC6, DK92.. 13.. 1AD2.. 1AD2, 1BY2.. 1AD4.. 1AD5.. 1AE4.. 1AF4.. 1AF4, 1AJ4, DF96.. 1AF5.. 1AG4.. 1AG5.. 1AH4.. 1AH5.. 1AH5, DAF96.. 1AJ4.. SEE 1AF4.. 1AJ5.. 1AK4.. 6.. 1AK5.. 1AM4.. 1AN5.. 1AN5, DF97.. 1AP5-P11.. 1AQ5.. 1AQ5, 1R5SF.. 8.. 1AS5.. 1AU2.. 1AU3.. SEE 1N2A.. 1AX2.. 1AY2.. 1B3GT.. 1B3GT, 1G3GT.. 1B4.. 1B4P.. 1B4T.. 1B4T, 951.. 1B5.. 1B5, 25S.. 1B7G.. 1B7GT.. 1B21.. 1B21, 471A.. 1B22.. 14.. 1B23.. 1B24.. 1B26.. 20.. 1B27.. 25.. 1B29.. 1B32.. 1B32, 532A.. 1B35.. 1B36.. 1B37.. 23.. 1B38.. 1B40.. 18.. 1B41.. 1B42.. 60.. 1B44.. 1B45.. 1B46.. 1B47.. 1B48.. 1B50.. 1B51.. 1B53.. 1B54.. 1B55.. 1B55, 5853.. 92.. 1B56.. 1B59.. 1B59, R1130B.. 1B60.. 1B62.. 1B63A.. 1B63B.. 22.. 1B84.. 1B84, TCG-2.. 1B85.. 1B85A.. 1B86.. 1BC2.. 1BG2.. 1BG2, DY51.. 1BH2.. 1BK2.. 1BK2, 1RK41.. 1BL2.. 1BQ2.. 1BQ2, DY802.. 1BV2.. 1BX2.. 1BX2, 1X2.. 1BY2.. SEE 1AD2.. 1C5G.. 1C5GT.. 1C5GT, DL35.. 1C6.. 1C7G.. 1C8.. 1C21.. 1C21, 2040.. 1D3.. 1D5G.. 1D5GP.. 1D5GT.. 1D6.. 1D7G.. 1D8GT.. 1D21.. SEE 631P1.. 1DG3.. 1DK1.. 1DK25.. 1DK27.. 1DK29.. 1DN5.. 1DP1.. 1DP1 CRT.. 100.. 1E4G.. 1E5G.. 1E5GP.. 1E5GT.. 1E7G.. 1E7GT.. 1E103P11.. 1E8.. 1EP1.. 35.. 1EP11.. 1E24.. 1F34.. 1F4.. 1F5G.. 1F6.. 1F7G.. 1F7GV.. 1G3GT.. SEE 1B3GT.. 1G4G.. 1G4GT.. 1G5G.. 1G6G.. 1G6GT.. 1H2.. 1H4G.. 1H5G.. 1H5GT.. 1H6G.. 1H6GT.. 1J3.. 1J3, 1K3.. 1J5G.. 1J6G.. 1J6GT.. 1J6GX.. 9.. 1K015CA.. 1K3.. SEE 1J3.. 1K75CLA.. 1K75CS.. 1K125CB.. 1L4.. 1L4, DF92.. 1L6.. 1L22.. 1L23.. 1L38.. 1L36.. 1LA4.. 1LA6.. 1LB4.. 1LC5.. 1LC6.. 1LD5.. 1LE3.. 1LE3, 1LF3.. 1LF3.. SEE 1LE3.. 1LG5.. 1LH4.. 1LN5.. 1M3.. 1M3, DM70.. 1N2A.. 1N2A, 1AU3.. 1N3.. 1N3, DM71.. 1N5G.. 1N5GT.. 1N6G.. 1N21.. 1N23.. 1N40.. 1N71.. 1N74.. 1N1238.. 1N1239.. 1N1239, REPLACES 866.. 1N1674.. 1N2631.. 1N2632.. 1N2637.. 1N2637, REPLACES 866A.. 1P5G.. 1P5GT.. 1P21.. 40.. 1P22.. 1P23.. 30.. 1P24.. 1P24, 936.. 1P25.. 1P28.. 47.. 1P29.. 1P30.. 16.. 1P31.. 1P32.. SEE 927.. 1P33.. 1P35.. 1P36.. 1P37.. 1P39.. 1P40.. 1P41.. 1P42.. 1Q5G.. 1Q5GT.. 1Q5GT, DL36.. 1Q6.. 1Q22.. 1Q23.. 1Q24.. 1Q25.. 1R4.. 1R4, 1294.. 1R5.. 1R5, DK91.. 1R5SF.. SEE 1AQ5.. 1RK31.. 1RK41.. SEE 1BK2.. 1S2.. 1S2, DY87, DY86.. 1S4.. 1S5.. 1S5, DAF91.. 1S6.. 1S21.. 1SA6GT.. 1SB6GT..  ...   2GU5.. 2GW5.. 2H21.. 2HA5.. 2HA5, 2HM5.. 2HK5.. 2HM5.. SEE 2HA5.. 2HQ5.. 2HR8.. 2HR8, XF86.. 2J129B.. 2J21.. 2J22.. 2J27.. 75.. 2J28.. 2J30.. 2J31.. 2J32.. 2J34.. 2J36.. 2J39.. 2J41.. 2J42.. 2J42H.. 2J48.. 2J49.. 2J50.. 400.. 2J51.. 125.. 2J53.. 2J54.. 2J56A.. 2J61.. 700.. 2J62.. 2J66.. 2K22.. 2K23.. 2K25.. 2K25, KS9-20A.. 2K26.. 2K28.. 2K28, 707B.. 2K29.. 2K31.. 2K33.. 85.. 2K39.. 2K41.. 2K42.. 2K44.. 2K45.. 150.. 2K46.. 2K54.. 2K55.. 2K56.. 2M128.. 2N43.. 2NH11.. 2P21.. 2RA6.. 2S/4S.. 2SM15.. 2V2.. 2V3G.. 2W3GT.. 2X2.. 2X2, 879, VT119.. 2X150G.. 2X1000A.. 2X3.. 2Y2.. 2Z2.. 2Z2, G84.. 3-100D2.. SEE VT127A-US.. 3-200A3.. 3-200A3, 592.. 200.. 3-27A.. 3-400Z.. 3-400Z, 8163.. 275.. 3-500Z.. 175.. 3-1000H.. 650.. 3-A-WE.. 3-A WESTERN ELECTRIC.. 3A2.. 3A3.. 3A3, 3AW3.. 3A4.. 3A4, DL93.. 3A5.. 3A5, DCC90.. 3A8GT.. 3AB4.. 3AB4, PC92.. 3ABP1.. 3ABP2.. 3ACP1A.. 3ADP1.. 3AP1.. 3AF4.. 3AF4, 3DZ4.. 3AJ8.. 3AL5.. 3AT2.. 3AT6.. 3AU6.. 3AV6.. 3AW2.. 3AW3.. SEE 3A3.. 3B.. 3B/240M.. 3B/240M, CV2214.. 3B2.. 3B4.. 3B4, DL98.. 3B5GT.. 3B7.. 3B7, 1291.. 3B21.. 3B21, NAVY 38401.. 3B22.. 3B22, EL1C.. 3B23.. 3B23, RK22.. 3B24W.. 3B24W, CV2858.. 11.. 3B25.. 3B26.. 3B27.. 3B28.. 3B29.. 3BA6.. 3BC5.. 3BC5, 3CE5.. 3BE6.. 3BH2.. 3BH2, GY501.. 3BL2.. 3BM2.. 3BN2.. 3BN4.. 3BN6.. 3BP1.. 3BS2.. 3BS2, 3BW2, 3BT2.. 3BT2.. SEE 3BS2.. 3BU8.. 3BU8, 3GS8.. 3BW2.. 3BY6.. 3BZ6.. 3C.. 3C2.. 3C4.. 3C4, DL96.. 3C5GT.. 3C6.. 3C6, XXB.. 3C21.. 3C21, ZB120, CEP120, CEP220, CUE120.. 3C22.. 3C23.. 3C24.. 3C24, 24G, VT 204.. 3C25.. 3C27.. 3C28.. 3C30.. 3C31.. 3C31, CIB.. 3C33.. 3C37.. 3C45.. 3C45, 6130 ,FX227.. 55.. 3CA3.. 3CB6.. 3CB6, 3CF6.. 3CE5.. SEE 3BC5.. 3CF6.. SEE 3CB6.. 3CN3.. 3CP1.. 3CPN10A5.. SEE 7815.. 3CPX100A5.. SEE 7815R.. 3CS6.. 3CU3.. 3CV3.. 3CX3.. 3CX3, 3DA3.. 3CX100A5.. SEE 2C39A.. 3CX400A7.. 3CX400A7, 8874.. 500.. 3CX800A7.. 3CX1000A7.. 3CX1000A7, 8283.. 3CX1500D3.. 3CX2500A3.. 3CX2500A3, 8161.. 3CX3000A7.. 3CX3000F1.. 600.. 3CY3.. 3CY3, 3DB3.. 3CY5.. 3CZ3.. 3D21.. 3D21, HYTRON DEV TYPE D21.. 3D6.. 3D6, 1299.. 3D21A.. 3D21WB.. 3D22A.. 118.. 3D23.. 3D23, TB35.. 3D24.. 3DA3.. SEE 3CX3.. 3DB3.. SEE 3CY3.. 3DC3.. 3DF3.. 3DG4.. 3DH3.. 3DHH12.. 3DHH13.. 3DJ3.. 3DK6.. 3DP1.. 3DP1A.. 3DP1/S2.. 3DP11.. 3DR3.. 3DS3.. 3DT6.. 3DZ4.. SEE 3AF4.. 3E5.. 3E6.. 3E22.. 3E29.. SEE 829B.. 3EA5.. 3EH7.. 3EH7, XF183.. 3EJ7.. 3EJ7, XF184.. 3ER5.. 3ER5, YC95.. 3ES5.. 3FH5.. 3FP7.. 3FQ5.. 3FQ5, 3GK5.. 3FS5.. 3GK5.. SEE 3FQ5.. 3GS8.. SEE 3BU8.. 3GW5.. 3H602.. 3H602 TUNGAR.. 3H607.. 3H619.. 3HA5.. 3HA5, 3HM5, LC900.. 3HK5.. 3HM5.. SEE 3HA5.. 3HP11.. 3HQ5.. 3HS8.. 3JC6.. 3JD6.. 3JP1.. 3JP12.. 3K30.. 3K30 KLYSTRON.. 3KF8.. 3KP1.. 3KT6.. 3LE4.. 3LF4.. 3MP26.. 3M-R24.. 3M-R24 SUB FOR 3DK6.. 3M-V7.. 3M-V7 SUB FOR 3BZ6.. 3Q4.. 3Q4, DL95.. 3Q5GT.. 3RP1A.. 3S4.. 3S4, DL92.. 3V4.. 3V4, DL94.. 3W4.. 3X100A5.. 3X2500F3.. 3X3000A1.. 3X3000F1.. 3XP1.. 3YP7.. 3Z4..

    Original link path: /Prices%200A1%20to%203Z4.htm
    Open archive

  • Title: 4-65A to 6BZ8
    Descriptive info: Vacuum Tube Prices 4-65A to 6BZ8.. 4-65A.. 4-65A, 8165.. 70.. 4-125A.. 4-125A, 4D21.. 95.. 4-125A-PULL.. 4-125A PULLED FROM OPERATING EQUIPMENT.. 4-250A.. 4-250A, 5D22.. 4-250A-PULL.. 4-250A PULLED FROM OPERATING EQUIPMENT.. 4-400A.. 4-400A, 8438.. 225.. 4-400A-PULL.. 4-400A PULLED FROM OPERATING EQUIPMENT.. 4-400B.. 4-400B, 7527.. 250.. 4-400C.. 4-400C, 6775.. 350.. 4-1000A.. 4-1000A, 8166.. 550.. 4-1000A-PULL.. 4-1000A 8166 PULLED FROM OPERATING EQUIP.. 300.. 4A6G.. 4AU6.. 4AV6.. 4B22.. 4B22, EL5B.. 4B24.. 4B24, EL3C, 6484.. 4B25.. 4B25, 6CF, 38674A.. 4B26.. 4B26, 189049, G-49.. 4B27.. 4B31.. 4B31-SS.. 4B31 SOLID STATE.. 4B32.. 4B32, GXU2.. 4B36.. 4B39.. 4B58.. 4B58 TUNGAR.. 4B/550E.. 4BA6.. 4BC5.. 4BC5, 4CE5.. 4BC8.. 4BC8, 4RHH2.. 4BE6.. 4BL8.. 4BL8, XCF80.. 4BN6.. 4BQ7.. 4BQ7, 4BZ7.. 4BS8.. 4BS8, 4BZ8.. 4BU8.. 4BU8,4GS8.. 4BX8.. 4BZ6.. 4BZ6 4JH6.. 4BZ8.. SEE 4BS8.. 4BZ7.. SEE 4BQ7.. 4C22.. 4C27.. 4C27, CV92.. 4C28.. 4C29.. 4C33.. 4C35.. 135.. 4CB6.. 4CB6, 4DE6.. 4CE5.. SEE 4BC5.. 4CH7.. 4CM4.. 4CM4, PC86.. 4CN15A.. 4CN15L.. 4CPX250K.. 90.. 4CPX350K.. 4CS6.. 4CS250H.. 4CS250HA.. 4CS250R.. 4CX125C.. 4CX250B.. 4CX250B, 7203.. 4CX250F.. 4CX250F,7204.. 4CX250FG.. 4CX250FG, 8621.. 4CX250K.. 4CX250K, 8245.. 4CX250M.. 4CX250R.. 4CX250R, 7580.. 4CX250R-PULL.. 4CX250R, 7580 PULLED FROM WORKING EQUIP.. 4CX300A.. 4CX300A, 8167.. 4CX300Y.. 4CX350A.. 4CX350A, 8321, DX553.. 190.. 4CX350B.. 4CX350F.. 4CX350F, 8322, DX362.. 4CX350FJ.. 4CX350FJ, 8904.. 4CX400A7.. 4CX600J.. 1000.. 4CX1000A.. 4CX1000A, 8168.. 410.. 4CX1500B.. 4CX1500B, 8660, Y763, YU127.. 4CX1500B-PULL.. 4CX1500B PULLED FROM WORKING EQUIPMENT.. 4CX3000A.. 4CX5000R.. SEE 8170W.. 4CX10000D.. 4CY5.. 4D21.. SEE 4-125A.. 4D22.. 4D23.. 4D32.. 4DC8.. 4DE6.. SEE 4CB6.. 4DK6.. 4DL4.. 4DL4, PC88.. 4DT6.. 4E27.. 4E27, 257B.. 4E27A.. 4E27A, 5-125B.. 4EH7.. 4EH7, LF183.. 4EJ7.. 4EJ7, LF184.. 4ES8.. 4ES8, XCC189.. 4EW6.. 4EW6, 4GM6.. 4FQ5.. 4FQ5, 4GK5, PC95.. 4GJ7.. 4GJ7, XCF801, 4GX7.. 4GK5.. SEE 4FQ5.. 4GM6.. SEE 4EW6.. 4GS7.. 4GS8.. SEE 4BU8.. 4GX7.. SEE 4GJ7.. 4GZ5.. 4HA5.. 4HA5, 4HM5.. 4HA7.. 4HA7, 4HC7.. 4HC7.. SEE 4HA7.. 4HK5.. 4HM5.. SEE 4HA5.. 4HM6.. 4HQ5.. 4HR8.. 4HR8, PF86.. 4HS8.. 4HS8, 4KF8.. 4HT6.. 4J50.. 4J52.. 4JC6A.. 4JC6A, 4JD6.. 4JD6.. SEE 4JC6A.. 4JH6.. SEE 4BZ6.. 4JK6.. 4JL6.. 4JS1.. 4JS1 SOLID STATE THYRATRON.. 4JW8.. 4KE8.. 4KF8.. SEE 4HS8.. 4KN8.. 4KN8, 4RHH8.. 4KT6.. 4LJ8.. 4LU6.. 4MK8.. 4MP12.. 4MP26.. 4PR60A.. 170.. 4PR60B.. 4PR60B, 8252.. 4PR60C.. 4PR60C, 8252W.. 4PR60WB.. 4PR65A.. 4PR65A, 8187.. 4PR250C.. 4PR400A.. 4PR400A, 8188.. 4PR1000A.. 4PR1000A, 8189.. 900.. 4PR1000A-PULL.. 4PR1000A, 8189 PULLED FROM WORKING EQUIP.. 425.. 4RHH2.. SEE 4BC8.. 4RHH8.. SEE 4KN8.. 4X100A.. 4X150A.. 4X150A, 7034.. 4X150A-PULL.. 4X150A PULLED FROM WORKING EQUIPMENT.. 4X150C.. 4X150D.. 4X150D, 7035.. 4X150F.. 4X150G.. 4X150G, 8172.. 65.. 4X150S.. 4X150S, 8297.. 4X250B.. 4X250B-PULL.. 4X250B PULLED FROM WORKING EQUIPMENT.. 4X250F.. 4X500A.. 5-125B.. SEE 4E27A.. 5A/157D.. SEE EF37A.. 5A6.. 5AF4.. 5AHP7A.. 5AM8.. 5AN8..  ...   5Z4GT.. 5Z4MG.. 6A2.. 6A3.. 6A4.. 6A5G.. 6A6.. 6A7.. 6A7S.. 6A7 SPRAY SHIELD.. 6A8.. 6A8G.. 6A8GT.. 6A8MG.. 6AB4.. 6AB4, EC92.. 6AB5.. 6AB5, 6N5.. 6AB6G.. 6AB7.. 6AB7, 1853.. 6AB8.. 6AB8, ECL80.. 6AB9.. 6AC5G.. 6AC5GT.. 6AC6GT.. 6AC7.. 6AC7, 1852.. 6AC7GT.. 6AC7WA.. SEE 6134.. 6AC10.. 6AD4.. 6AD5G.. 6AD6G.. 6AD6G, 6AF6G.. 6AD7G.. 6AD8.. SEE 6DC8.. 6AD10.. 6AE5G.. 6AE5G, 6AF5G.. 6AE5GT.. 6AE5GT, 6AF5GT.. 6AE6G.. 6AE7GT.. 6AF3.. 6AF4.. 6AF4, 6DZ4.. 6AF5G.. SEE 6AE5G.. 6AF5GT.. SEE 6AE5GT.. 6AF6G.. SEE 6AD6G.. 6AF9.. 6AF11.. 6AG5.. 6AG5, EF96.. 6AG6G.. 6AG6G, EL33.. 6AG7.. 6AG7, 6AK7.. 6AG9.. 6AG11.. 6AH4GT.. 6AH5G.. 6AH6.. 6AH6WA.. SEE 6485.. 6AH7GT.. 6AH9.. 6AJ4.. 6AJ5.. 6AJ6.. 6AJ7.. 6AJ8.. 6AJ8, ECH81.. 6AK4.. 6AK5.. 6AK5, EF95.. 6AK5W.. SEE 5654.. 6AK6.. 6AK7.. SEE 6AG7.. 6AK8.. 6AK8, EABC80.. 6AK10.. 6AL3.. 6AL3, EY88.. 6AL5.. 6AL5, EAA91, CV4025.. 6AL5W.. SEE 5726.. 6AL6G.. 6AL7GT.. 6AL11.. 6AM4.. 6AM5.. 6AM5, EL91.. 6AM6.. 6AM6, EF91.. 6AM8.. 6AN4.. 6AN5.. 6AN6.. 6AN7.. 6AN7, ECH80.. 6AN8.. 6AQ4.. 6AQ4, EC91.. 6AQ5.. 6AQ5, 6HG5, EL90.. 6AQ6.. 6AQ7GT.. 6AQ8.. GENERIC 6AQ8.. 6AR5.. 6AR6.. 6AR6-PULL.. 6AR6 PULLED FROM WORKING EQUIPMENT.. 6AR6WA.. SEE 6098.. 6AR8.. 6AR11.. 6AS5.. 6AS6.. 6AS6, CV4011, M8196.. 6AS7G.. 6AS7GA.. 6AS7GYB.. 6AS8.. 6AS11.. 6AT6.. 6AT6, EBC90.. 6AT7N.. 6AT8.. 6AU4GT.. 6AU5GT.. 6AU6.. 6AU6WA.. SEE 6136.. 6AU6WB.. 6AU6WC.. 6AU7.. 6AU8.. 6AU8, 6BH8.. 6AV3.. 6AV5GA.. 6AV5GT.. 6AV6.. 6AV6, EBC91.. 6AV11.. 6AW6.. 6AW8.. 6AX3.. 6AX4GT.. 6AX5GT.. 6AX6G.. 6AX7.. 6AX8.. 6AY3.. 6AY3, 6BS3.. 6AY11.. 6AZ5.. 6AZ6.. 6AZ6, C1106.. 6AZ8.. 6B3.. 6B5.. 6B6G.. 6B7.. 6B7S.. 6B7S SHIELDED.. 6B8.. 6B8G.. 6B8GT.. 6B10.. 6B1000.. 6BA3.. 6BA4.. 6BA5.. 6BA6.. 6BA6, EF93.. 6BA6W.. SEE 5749.. 6BA7.. 6BA8.. 6BA11.. 6BB14.. 6BC4.. 6BC5.. 6BC5, 6CE5.. 6BC7.. 6BC8.. 6BC8, 6BZ8.. 6BD4A.. 6BD5GT.. 6BD6.. 6BD7.. 6BD7, EBC81.. 6BD11.. 6BE3.. 6BE3, 6BZ3.. 6BE6.. 6BE6, EK90.. 6BE7.. 6BE7, EQ80.. 6BF5.. 6BF6.. 6BF7.. 6BF8.. 6BF11.. 6BG6G.. 6BG6GA.. 6BG7.. 6BH3.. 6BH6.. 6BH8.. SEE 6AU8.. 6BH11.. 6BJ3.. 6BJ5.. 6BJ5, N78.. 6BJ6.. 6BJ7.. 6BJ8.. 6BK4.. 6BK4A.. 6BK4B.. 6BK4C.. 6BK4C, 6EL4A.. 6BK5.. 6BK6.. 6BK7.. 6BK8.. 6BK8, EF83.. 6BK11.. 6BL4.. 6BL5GT.. 6BL6.. 180.. 6BL7GTA.. 6BL8.. 6BL8, ECF80.. 6BM5.. 6BM6.. 115.. 6BN4.. 6BN5.. 6BN5, EL85.. 6BN6.. 6BN6, 6KS6.. 6BN7.. 6BN8.. 6BN11.. GENERIC 6BQ5, EL84.. 6BQ6G.. 6BQ6GA.. 6BQ6GA, 6CU6.. 6BQ6GT.. 6BQ6GT, 6CU6.. 6BQ7.. 6BQ7, 6BZ7.. 6BR3.. 6BR3, 6RK19.. 6BR5.. 6BR5, EM80, 6E1P.. 6BR7.. 6BR8.. 6BR8, 6FV8.. 6BS3.. SEE 6AY3.. 6BS4.. 6BS4, EC93, EC903.. 6BS7.. 6BS8.. 6BT4.. 6BT4, EZ40.. 6BT8.. 6BU5.. 6BU8.. 6BV7.. 6BV8.. 6BV11.. 6BW3.. 6BW3, 6CG3.. 6BW4.. 6BW6.. 6BW7.. 6BW8.. 6BW11.. 6BX6.. 6BX6, EF80.. 6BX7GT.. 6BX8.. 6BY4.. 58.. 6BY5G.. 6BY5GA.. 6BY6.. 6BY7.. 6BY7, EF85.. 6BY8.. 6BY11.. 6BZ3.. SEE 6BE3.. 6BZ6.. 6BZ6, 6JH6.. 6BZ7.. SEE 6BQ7.. 6BZ8.. SEE 6BC8..

    Original link path: /Prices%204-65A%20to%206BZ8.htm
    Open archive



  •  


    Archived pages: 72