Twin triode, highmu tube data provided by duncan amplification. Book depository books with free delivery worldwide. You can use acrobat for viewing and printing pdf files. The anode is strengthened by pressing a ridge in the broad face. Due to the numbering schemes in use there are three variant classifications of vtxyz valves. Original genalex gold lion ecc81b739 tubes are considered the best 12at7 types ever made. Eirc electronic tubes factory data sheet ecc81 12at7 page 1 of 4 telephone. The 5965 version of the 12at7 has a lower gain of 47. The most accurate method to test tubes, the curve plots can actually be compared to the printed examples for each tube type that appear in the manufacturer technical data sheets and books. Today, it is by far the most common preamp tube used for electric guitar amplification and there is an almost overwhelming supply of. Herein you will find a collection of vintage engineering texts, vacuum tube datasheets, and other obsolete information, presented free of charge and without annoying advertisements.
In old vacuum tube data books from the 1950s, the 12at7 ecc81 tube is actually listed as a vhf type. Vacuum tube 12ax7 c, groove tubes antique electronic. I love and appreciate tube based audio gear and own sixteen pieces of tube gear between my two reference systems. A common substitution is to replace a 12ax7 with a 5751 or a 12ay7 to tame a preamp that. For other taylor tubes, see the entire 1945 taylor tube catalog in pdf format note, 1.
Four whiz kids set out to foil the plans of a mad scientist in this early reader series. Bold designators are close or identical, italic designators are different ratings, different pinouts or different filament voltages. You dont get data on late tubes like the 6au6, 6u8, or television sweep tubes. Power tube selection charts for highpower audioamplifiers eimac,rcapage 1, rca page 2. The 12ax7 was originally intended as replacement for. Tube depot carries a selection of 12at7 ecc81 cv4024 pre amp vacuum tubes. Rca and sylvania first introduced the 12ax7 to the world in the late 1940s. It belongs to a large family of dual triode vacuum tubes which share the same pinout eia 9a, including in particular the very commonly used lowmu 12au7 and highmu 12ax7 the 12at7 has somewhat lower.
In most cases the tubes manufactured to the european system have an exact equivalent tube in the american system and vice versa. This list was compiled from the cv register and several other sources. Please see the substitutes at the top of the page for more details. Muticolor vacuum tube shield aluminum alloy 9g55 shield caps for 9 pin 12ax7 12au7 12at7 tubes pack of 5. I have more than 100 pieces, most of them were made in 60s and 70s, this batch is from 1962 complete tube data is in every single box, like big transmitting us wwii tubes.
Sometimes you can find a bargain because of the unexpected tube number. Tube 12at6 or rohre 12at6 id2948, double diodetriode, miniatur7pinbase b7g, usa 1940 and audio frequency shown. It was developed around 1946 by rca engineers in camden, new jersey, under developmental number a4522. Vacuum tube, vintage radio and other electronics information. Tube type list the following list shows the tube types i have entered in my database, with exception of the service types e. An inexpensive, easy to build diy valve tube tester for quite some time i have been looking at developing a design for a diy valve tube tester that is easy to build and uses readily available, low cost parts. My favorite tubes and their substitutes positive feedback. As of 3505, i have finished scanning the general section, receiving tubes part 1, receiving tubes part 2, miscellaneous, specialpurpose receivingtype tubes, thyratron, ignitron, and glowdischarge tubes, and most of the transmitting tubes, as well as all. You even get data on the early tubes like 00 and 01, the 30, and the 15. Also includes very nice cross reference for americanforeign numbers and cv numbers. The 12at7 also has a gain factor of 70, but since the plate resistance is different, the 5751 is closer to the 12ax7. The gain factor of the 12ax7 is 100 and the gain factor for the 5751 is 70. Etc, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors. Miniature type used as phase inverters or twin resistance coupled amplifiers in radio and audio equipment.
Tubes 12ae7, 12at7, 12au7, 12av7, 12ay7, 12az7, 12al5. Tube characteristics and substitutions some quick and dirty subs and some tube data such as recommended bias current and appx voltages. The underscore and these letters are not part of the tube type number. Details about tubes 12ae7, 12at7, 12au7, 12av7, 12ay7, 12az7, 12al5, 12av6 and more 0119.
From the red dot in the image is the selected control point, you can see that the network voltage is 1v, the board voltage is around v, and the board. My favorite tubes and their substitutes by robert h. The 12ax7 was originally intended as replacement for the 6sl7 family of dualtriode amplifier tubes. Originally, the 12ax7 ecc83 vacuum tube was introduced to be a superior option for lower noise and microphonics over the 6sl7 tube that was commonly used in. A short catalog of tubes you are likely to see in a guitar amp. This data is based on my experience, and input from my electrical engineering audiophile friends. This is done in case of equal tube type numbers for different tubes. It was released for public sale under the 12ax7 identifier on september 15, 1947. Double triode quick reference data anode current ia10ma transcoductance s5,5mav amplification 60 heating heating is indirect by ac od dc, with serial or parallel supply. However, the plate resistance and transconductance are such that this tube makes a good substitute for type 12ax7. You can use the search to find service types or go to the service type lists that you can access from the page more tube related stuff. For more information on 12at7 vacuum tubes including pinouts, ratings, datasheets. Raytheon radio tube data and substitution chart by.
The data set book series 7 books all formats kindle edition from book 1. If the page is blank click here rca 12at7 datasheet. These subs are all taken from the tube substitution handbook sold by antique electronics supply. My tube manual indicates that these tubes are video amplifiers. You get data on regulator tubes and even the flat, miniature hearing aid tubes. Tube 12sq7 or rohre 12sq7 id2638, double diodetriode, octal int. The older real 5751s have extra thick mica spacers and extra support rods to minimize microphonic response. Genalex gold lion ecc81b739 12at7 dual triode preamp tube with gold pins.
Substitutes are given as a guide only please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. The gain is high and the american groove tubes must be filtering out the noisiest ones. These are all pin compatible with one another, the only differences being the gain factor of each tube. The 12au7 is the last tube on this list and it has the lowest gain, with an amplification factor of 20. With the very large number of vacuum tubes or thermionic valves that were produced and as a result of the multiple vacuum tube numbering systems that were in use, there are generally equivalents for most types of tube. Another common name for the 12ax7 tube is ecc83 and for premium versions the 7025 and ecc803 audio tubes. You can give them a try, but if you dont like a 12at7 subbed in whatever position you try, you will probably not like the 12av7.
It belongs to a large family of dual triode vacuum tubes which share the same pinout eia 9a, including in particular the very commonly used lowmu 12au7. I had a heathkit nixie tube frequency counter when i was a kid, plus the numitron calculator and the clock too. The 12au7 is probably the first noval b9a tube ever, registered on october 18, 1946, in the electron tube registration list, followed by the 2c51, registered on november 25, 1946. This 1951 sylvania below manual provides tube data sheets from 1930s to early 1950s receiving tubes plus great technical information and useful circuit diagrams. In the cases tabulated below there are more than one valve for a given vt marking.
This is the ubiquitous chinese 12ax7 with added selection. The first plan is to consider the reactive current and tube anode voltage. Each triode of a 12at7 can be compared both internally balanced and to other tubes matched. Valve vacuum tube data sheets and application notes. Although originally marketed as pentode tubes for use in early television receivers, they found additional uses in audio and radiotelephone equipment.
The tubes are precision manufactured in a factory a portion of the old tesla tube factory in prague, czech republic which cranks out the parts and materials, and then final assembly and listening sessions with reference source materials take. For years i have been using a valve tester that i had developed in the past. Text in other languages may differ dimensions whd incl. I am working on scanning and placing on this page the entire rca hb3 tube manual. I found a large amount of matched pairs tektronix, inc. Ecc8112at7 page 1 of 4 franks electron tube data sheets. From the 12ax7 uniform plate characteristic curve, i chose the idle running point in a relatively linear region. If the page is blank click here rca 6fq7 6cg7 datasheet. The 12bv7, 12by7, 12by7a, and equivalents were a class of mediumlow gain, pentode vacuum tube amplifiers using the noval socket configuration.
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