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RE: Defective 300B Tubes?

I suspect Gold Lions (Russian) because I ran into a rash of their 300B's that were bad right out of the box. They couldn't stand the shaking from shipping, and it was with two different Cary 300SEI amps that they came with. One amp amp even had the replacements bad.
On to your problem. There are many ways a tube can fail. When they fail suddenly like that often it is there own heat causing a deformity, or a bad internal connection. They're fine until they cool down, then heated again the connection finally breaks.
Dan Santoni

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