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there must be a scientific reason for tube break-in

My riddle of the humming V5 socket Sherwood has lead to some interesting findings.

In the V5 socket this happens.

If I put in an OLD tube - any old tube - there is NO hum.
If I put in a NEW tube - any new tube - it hums.

If I put in a NEW tube: the MORE hours it has on it - the LESS it hums.

There is a direct relationship to the number of hours on the tube to the loudness of the hum.

I've been burning in several GoldLion B759 tubes. It seems that at about 200-300 hours - that seems to be the NO hum point.

Any scientific reasons?

charles


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Topic - there must be a scientific reason for tube break-in - airtime 06:55:30 01/18/16 (12)

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