Tube DIY Asylum

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RE: Are these military potted trannys?

Posted by DAK on March 9, 2017 at 08:45:49:
There might be some derating built into them. You could build a SE el34/kt66 amp like Eli suggested. With biasing at 60ma. Then see how warm they get with running 6550 tubes with the bias set at 70ma. If they get pretty hot after an hour you probably need to back down. But, el34 or el37 and kt66 sound really nice at 60 to 65ma.