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danFrank 5th December 2006 09:28 PM

6C4C - 6S4S - 6B4G op points?
I have read here in the past that a lot of the members here like using the Russian 6C4C - 6B4G at 350 volts on the plate with about a 5K load.
My question is: What current do you run them at with 350 volts B+? Is the plate dissipation 15 watts on these Russian tubes or can they go higher with no ill effects on the life of the tube?
What is the average life of the 6C4C... 1000hrs? 2000?
Thanks in advance... Daniel

jrdmedford 6th December 2006 05:32 AM

Brezhnev era vs. Yeltsin era 6C4C
There are two types of 6C4C. I have some from 1972 production
runs that are biplate. They look like the usual biplate Chinese or
USA RCA types. Then, somewhere in the 1990s, 6C4C monoplates showed up. These have a higher plate dissipation and max Va compared to the usual 6B4G. I'd not run Soviet era
6C4C past the 300V 6B4G op point. AFAIK, the Soviet era clones were build to be compatible with the Western counterparts.

You can get good NOS USSR tubes in Europe for not much money.
Polish and Lithuanian friends are good to have. :)

-- Jim

AndreasS 6th December 2006 06:51 AM

I use the old russian 6B4G only in push-pull class-A amplifiers, the operation point is 300V @ 50 mA per tube, Raa is 6,6 kOhm.


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