Tube Amps / Music Electronics
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|previous: Trace Hi all!||View Thread|
|11/15/1998 7:40 PM|
|Graywater||Re: 7199 and 7408 tubes...is anyone familer with these??|
Trace: The 7408 is an industrial version of the 6V6 - sort of a 6V6WGT. I don't know if an "A" version of the 7408 was made, if so the dissipation is 14w, if not 12w.
The 7199 is a high-quality audio triode/pentode in one envelope and I can't think of any reason to replace them with 12AX7s unless the sockets are empty and your are having trouble finding the 7199s - if you've got the tubes they are probably US made and better quality than the current 12AX7 production.
1- plate, triode
2- plate, pentode
3- screen grid, pentode
4 & 5 heater
6- cathode/suppressor grid, pentode
7- control grid, pentode
8- cathode, triode
9- control grid, triode
The triode section has a mu of 17 and the pentode has a transconductance of 1,500 - 7,000 umhos depending on circuit design.