12dt7 tube data book

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. The data set book series 7 books all formats kindle edition from book 1. Raytheon radio tube data and substitution chart by. It has much higher transconductance, and much lower dynamic plate resistance than a 12ax7. Details about tubes 12ae7, 12at7, 12au7, 12av7, 12ay7, 12az7, 12al5, 12av6 and more 0119. Tube depot carries a selection of 12at7 ecc81 cv4024 pre amp vacuum tubes. Tube characteristics and substitutions some quick and dirty subs and some tube data such as recommended bias current and appx voltages. These subs are all taken from the tube substitution handbook sold by antique electronics supply.

These are all pin compatible with one another, the only differences being the gain factor of each tube. 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. Free vacuum tube data sheets free vacuum tube substitution. From the 12ax7 uniform plate characteristic curve, i chose the idle running point in a relatively linear region. Vacuum tube, vintage radio and other electronics information. This data is based on my experience, and input from my electrical engineering audiophile friends. Vacuum tube 12ax7 c, groove tubes antique electronic. In the cases tabulated below there are more than one valve for a given vt marking. 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. 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. Ecc8112at7 page 1 of 4 franks electron tube data sheets. Four whiz kids set out to foil the plans of a mad scientist in this early reader series. This 1951 sylvania below manual provides tube data sheets from 1930s to early 1950s receiving tubes plus great technical information and useful circuit diagrams. Double triode, 6h8c datasheet, 6h8c circuit, 6h8c data sheet.

I had a heathkit nixie tube frequency counter when i was a kid, plus the numitron calculator and the clock too. The underscore and these letters are not part of the tube type number. It was released for public sale under the 12ax7 identifier on september 15, 1947. 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.

The first plan is to consider the reactive current and tube anode voltage. The 12ax7 was originally intended as replacement for the 6sl7 family of dualtriode amplifier tubes. The 12at7 also has a gain factor of 70, but since the plate resistance is different, the 5751 is closer to the 12ax7. Today, it is by far the most common preamp tube used for electric guitar amplification and there is an almost overwhelming supply of. 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. Twin triode, highmu tube data provided by duncan amplification. Miniature type used as phase inverters or twin resistance coupled amplifiers in radio and audio equipment. Sometimes you can find a bargain because of the unexpected tube number. 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.

With almost datasheets and the visitor counter indicates over 4000. Please see the substitutes at the top of the page for more details. Genalex gold lion ecc81b739 12at7 dual triode preamp tube with gold pins. The anode is strengthened by pressing a ridge in the broad face. You even get data on the early tubes like 00 and 01, the 30, and the 15. In most cases the tubes manufactured to the european system have an exact equivalent tube in the american system and vice versa. The gain factor of the 12ax7 is 100 and the gain factor for the 5751 is 70. However, the plate resistance and transconductance are such that this tube makes a good substitute for type 12ax7. 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. 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. The 12bv7, 12by7, 12by7a, and equivalents were a class of mediumlow gain, pentode vacuum tube amplifiers using the noval socket configuration. The 5965 version of the 12at7 has a lower gain of 47. I love and appreciate tube based audio gear and own sixteen pieces of tube gear between my two reference systems.

My favorite tubes and their substitutes by robert h. Text in other languages may differ dimensions whd incl. 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. Power tube selection charts for highpower audioamplifiers eimac,rcapage 1, rca page 2. This is the ubiquitous chinese 12ax7 with added selection. In old vacuum tube data books from the 1950s, the 12at7 ecc81 tube is actually listed as a vhf type. For more information on 12at7 vacuum tubes including pinouts, ratings, datasheets. A common substitution is to replace a 12ax7 with a 5751 or a 12ay7 to tame a preamp that.

This list was compiled from the cv register and several other sources. You dont get data on late tubes like the 6au6, 6u8, or television sweep tubes. 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. 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. 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. Also includes very nice cross reference for americanforeign numbers and cv numbers. Etc, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors. Valve vacuum tube data sheets and application notes.

Book depository books with free delivery worldwide. You get data on regulator tubes and even the flat, miniature hearing aid 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. My tube manual indicates that these tubes are video amplifiers. 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. Muticolor vacuum tube shield aluminum alloy 9g55 shield caps for 9 pin 12ax7 12au7 12at7 tubes pack of 5. The thin glass tube envelope is 20 mm in diameter and excluding b9a base pins the length is 47 mm. I am working on scanning and placing on this page the entire rca hb3 tube manual. My favorite tubes and their substitutes positive feedback. Tube type list the following list shows the tube types i have entered in my database, with exception of the service types e. Original genalex gold lion ecc81b739 tubes are considered the best 12at7 types ever made.

If the page is blank click here rca 6fq7 6cg7 datasheet. 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. Although originally marketed as pentode tubes for use in early television receivers, they found additional uses in audio and radiotelephone equipment. Just like the 12ax7 tube, the 12at7 has many different versions created for specific reasons, such as low noise and ruggedness. Tubes 12ae7, 12at7, 12au7, 12av7, 12ay7, 12az7, 12al5. Valve data sheets and application notes valve manufacturers data sheets 6080. The gain is high and the american groove tubes must be filtering out the noisiest ones.

It was developed around 1946 by rca engineers in camden, new jersey, under developmental number a4522. For other taylor tubes, see the entire 1945 taylor tube catalog in pdf format note, 1. This is done in case of equal tube type numbers for different tubes. March of the mini beasts, dont disturb the dinosaurs, the sky i. Another common name for the 12ax7 tube is ecc83 and for premium versions the 7025 and ecc803 audio tubes. For years i have been using a valve tester that i had developed in the past. Bold designators are close or identical, italic designators are different ratings, different pinouts or different filament voltages. Tube 12at6 or rohre 12at6 id2948, double diodetriode, miniatur7pinbase b7g, usa 1940 and audio frequency shown. A short catalog of tubes you are likely to see in a guitar amp. The 12ax7 was originally intended as replacement for. 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. Due to the numbering schemes in use there are three variant classifications of vtxyz valves. I found a large amount of matched pairs tektronix, inc. If the page is blank click here rca 12at7 datasheet. The 12au7 is the last tube on this list and it has the lowest gain, with an amplification factor of 20. Each triode of a 12at7 can be compared both internally balanced and to other tubes matched. You can use acrobat for viewing and printing pdf files. Eirc electronic tubes factory data sheet ecc81 12at7 page 1 of 4 telephone. Rca and sylvania first introduced the 12ax7 to the world in the late 1940s.