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In Reply to: RE: 450v plate and screen? posted by Jim McShane on June 08, 2017 at 14:21:23
I changed to a pair of JJ 6V6S, they don't have the hot spots.
Normally, I stay away from JJ octals, but in this case, they fixed it.
I think the TungSol was a defective pair.
The screens are drawing 2 mA each with either tube type.
Follow Ups:
That definitely could be the case. I've had ONE case of the 6V6GTs acting up in all the years I've had them. And many have been used at 425 -450 volts. But it can happen... Hopefully the vendor will stand behind yours!
Al, on many Fender amps... changing the screen resistors to wire wound or metal oxide, 5-watt 1k-ohm usually helps stabilize the output tubes.
My DR runs over 450VDC on the plates. I bias them to about 20mA per tube.
Photo is of my Super Reverb, I put 1k-ohm bricks onto the screen grids.
Good luck!
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