6V6's in Tweed Super

[RobBozic]

I've just tried some JJ6V6's in a tweed super clone. My plate voltage is 435V with a 5R4GYA rectifier, I've got 1K 2W screen resistors.

The JJ6V6 data sheet says the screens can handle 450V & the plates can handle 500V, but I want to be on the safe side.

Should I increase the value of these resistors to drop the screen voltage down more?

Thanks
Rob

[tubeswell]

What is your plate dissipation? IMHO JJ6V6s in Class AB1 can handle those voltages if they are biased so that the dissipation is around 70-85% of 14W at idle - preferably on the lower side. (What do they look like when you fire them up?)

[RobBozic]

I've got them at 70%. Do you think I should bias them hotter so as to drop the voltage?

Rob

[tubeswell]

If that is what they are , they are running within spec. What do they sound like?

If you want lower volatges, why not try a 5y3G or zener down the B+?