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How long do 6/12SN7s last in M60?

I have M60s built from kit in 1998 and have been using the same set of 12SX7s (V1 and V2)and 12SN7s (V3 and V4) since. I changed one set of 6AS7 a few years ago.

Last night, I noticed hum in one amp.

Normally how long do 6/12SN7s last? What is the plate voltage for the 6/12SN7s in M60? 12SX7 is rated maximal 300-volts. Thanks for your input. MP.


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Topic - How long do 6/12SN7s last in M60? - MP 09:34:15 02/09/17 (2)

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