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Leakage? -- Hum from new tube

Scruffy,

Another possibility for the hum could be due to leakage in the 6SN7 you identified as emitting a small amount of hum. Such a tube can work perfectly without any hum in some circuits (such as driver applications) whereas in other circuits while otherwise functioning properly will cause some hum (such as in a gain stage).

Thus if you have such a tube don't assume it is bad and thus dump it. Instead be aware there are applications you can use it that the leakage does not induce the hum.

Per a well-known tube store: You cannot correlate leakage with wear as many new tubes have leakage and obviously no wear. Where leakage is a serious problem relates primarily to applications higher than the audio frequency range.



Edits: 02/08/17

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  • Leakage? -- Hum from new tube - JazzDude 09:17:38 02/08/17 (0)

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