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How long do 6/12SN7s last in M60?

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Posted on February 9, 2017 at 09:34:15
MP
Audiophile

Posts: 10
Joined: July 2, 2001
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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a long time?, posted on February 9, 2017 at 11:22:38
Ralph
Manufacturer

Posts: 3204
Location: Minnesota
Joined: April 24, 2002
Contributor
  Since:
April 1, 2002
We've seen them go 50,000 hours.

We don't seem to see such long hours on newer production, in particular the Russian tubes (we've been using Chinese 6SN7s since about 1999 and seen some of them that were original tubes still be good 12-14 years later, after 'continuous' use).

 

RE: a long time?, posted on February 9, 2017 at 11:46:08
MP
Audiophile

Posts: 10
Joined: July 2, 2001
Thank you, Ralph. Good to know. The 12sn7 tubes are Tungsol and GE (driver).

 

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