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The 12/10/6EM7, I am told, all were used as vertical oscillators in TVs. The small triode has excellent gain and noise characteristics and is good for input gain. The larger triode has plate resistance of only 750 ohms and can be used as a driver - a twofer.
I use the 6EM7. I have them. It's on Duncan. They work great, but for the life of me I can find no information about the 12EM7, anywhere, except one mfr's page (McAlister Audio). He referred me to the RCA receiving manual, but I could find no 12EM7 at all.
Can anyone help?
"What did the Romans ever do for us?"
Follow Ups:
All the datasheet is going to tell you is that the 13EM7 is the same as the 6EM7, except for heater voltage and current. There is no separate datasheet.
Ever seen this used before as an input and to drive a KT88/6550 in Class A? One tube (as both input + driver) per power tube?
"What did the Romans ever do for us?"
In class A, a 6550 isn't going to need much drive voltage. A 6EM7 has a high gain triode and a low gain triode, if you use both of them as voltage amplifiers, you will have a very high gain amp (which you could tame with feedback).
The low mu triode is probably enough to drive a 6550 if you have a strong active preamp behind it.
And that larger triode section works VERY well as a low-power output stage. See Music Reference's EM7 SET amps.
Ouside are a pair of 12s; center is a 5.
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Thanks. Thinking about using them in front of a pair of KT88s in Class A triode.
"What did the Romans ever do for us?"
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