12ad7 tube data book

I am working on posting the rca hb3 tube handbook on line on this. The underscore and these letters are not part of the tube type number. Data sheet and box are a bit tattered but the tube is an excellent tube, you really do get what you pay for. In addition to the data i have scanned and posted, if youre looking for data on a particular tube you should visit tsdl on duncanamps website, or franks tube data. For zerobias data, generator impedance is negligible. Its an electrically more robust tube then the 12au7, and as such, your 12au7 is probably taking a severe beating. I have since replaced this with a vintage nec 12ad7 and that has improved the amp in almost every way. At the bottom of this page youll find some links to other tube datasheet sites in case you cant find what youre. Developed by rca and released in september of 1947, the 12ax7 is a high gain low noise tube that is the most popular tube used in inputinterstage audio. In the past, this tube was known simply as a favorite driver for the old macintosh amps, or as an inexpensive alternative to. I will first attempt to describe each version and provide data for each.

Highvoltage considerations for television picture tubes, picture. March of the mini beasts, dont disturb the dinosaurs, the sky i. These subs are all taken from the tube substitution handbook sold by antique electronics supply. The 12dw7 has two different sides, one with a gain factor of 100 like a 12ax7, and one with a low gain factor of about 20, like a 12au7. The 12bh7 shares many similarities to the 6sn7 also a favorite tube around these parts, but is characterized by a darker sound.

A short catalog of tubes you are likely to see in a guitar amp. This book has a little of everything, providing over 400 examples of information graphics from around the world, covering journalism art, government, education, business, and more. I have been told by my tube dealer that it sounds very close to the. Four whiz kids set out to foil the plans of a mad scientist in this early reader series.

It was developed around 1946 by rca engineers in camden, new jersey, under developmental number a4522. I found these tubes inside the previously mentioned akai tape recorders as well. 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. It has much higher transconductance, and much lower dynamic plate resistance than a 12ax7. Tube data in addition to the data i have scanned and posted, if youre looking for data on a particular tube you should visit tsdl on duncanamps website, or franks tube data. It needs to be said, though, that you should consider trying the amps before raping them for the tubes. Information came from the rca archive in gold hill, or, courtesy of ludwell sibley of the tube collectors association, from the ge essential characteristics tube manual of 1973, and from personal files. The m80, for example, is a little el84 based, single ended amp two in parallel with two signal paths. 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. At the bottom of this page youll find some links to other tube datasheet sites in case you cant find what you. 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. The 18 best data visualization books you should read. Rca homeentertainment and industrial receivingtype tubes and on picture 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.

Tube type list the following list shows the tube types i have entered in my database, with exception of the service types e. They do list it in their tech manual in the condensed data section, as does ge, but rca refuses to acknowledge its existence. My tube manual indicates that these tubes are video amplifiers. With almost datasheets and the visitor counter indicates over 4000. It sounds like a new amp with this vintage tube in. In the 12dw7ecc832, section 1 of the tube pins 6, 7, and 8 is the high gain 12ax7ecc83 spec gain factor 100 and section 2 pins 1, 2, and 3 is the low gain 12au7ecc82 spec gain factor 17. Does anyone know of a good substitute for this tube, or a good source of nos ones. I found a large amount of matched pairs tektronix, inc. According to one internet expert, the 12ad7 was developed by sylvania, supposedly to capture a share of rcas 7025 market.

Another spot to look, which is especially useful if youre looking for replacement types and tubes with similar bases or characteristics, is the nj7p tube database. Each side of the tube does a different job in the amp, like two separate tubes. I had a heathkit nixie tube frequency counter when i was a kid, plus the numitron calculator and the clock too. The 12ax7 is one of the most widely used double triodes in audio circuits. In most cases, they can all substitute for each other. However, the plate resistance and transconductance are such that this tube makes a good substitute for type 12ax7. In the past, this tube was known simply as a favorite driver for the old macintosh amps, or as an inexpensive alternative to the 5687 and the 12au7. 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. Tube 12av6 or rohre 12av6 id1070, double diodetriode, miniatur7pinbase b7g, usa 1940 and audio frequency shown. The gain factor of the 12ax7 is 100 and the gain factor for the 5751 is 70. If the page is blank click here rca 6fq7 6cg7 datasheet. Tube characteristics and substitutions some quick and dirty subs and some tube data such as recommended bias current and appx voltages. Tube 12ad7 or rohre 12ad7 id5273, double triode, noval, b9a and shown. Jun, 2007 according to one internet expert, the 12ad7 was developed by sylvania, supposedly to capture a share of rcas 7025 market.

I managed to get two nos ones a while ago, but im concerned about long term support. In most tubes, like the 12ax7, the two sides are identical. These tubes are dual triodes actually two tubes in one. Then, i will follow up with short descriptions of some that i currently have for sale. Tube 6ar5 tube power amplifier pentode 1800rfparts 18007372787 17607440700 usa orders.

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. Im happy using sovtek 5881s as outputs they work really well in my setup, and am looking forward to the svetlana 6l6, but probably need to pick up a few spares of the 12bh7. This is done in case of equal tube type numbers for different tubes. In electronics, a vacuum tube, electron tube in north america, tube, or thermionic valve or valve in british english is a device controlling electric current through a vacuum in a sealed container. Picture tube characteristics and socket diagrams occupy pages. It was released for public sale under the 12ax7 identifier on september 15, 1947. The new rca reference book features interchangeability directories for tubes, transistors, and batteries.