Re: "Burning - in" Double Triodes
Amplifiers, yes. Electronics in general - harder question.
I do recall Smithy explaining to Dick that failure of a TV frame-hold or line-hold to be adjustable to the correct frequency could be just due to the unlucky insertion of a valve with a grid cut-off voltage a bit more extreme than general. He explained that cut-off is subject to fairly wide variations between samples, and in a multivibrator it does affect frequency.
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