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Do It Yourself (DIY) paradise for tube and SET project builders.

RE: How rugged are vintage 2A3 tubes?

In my building, I try my best to follow the rule published by RCA and repeated by Morgan Jones that power tube envelopes should be spaced from one another by 1-1/2 times the diameter of the envelope. I see a lot of push pull 2A3 amplifiers that don't apply this rule. I'm not sure why.


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