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OTL, Output Transformerless Amplifier User Group.

a long time?

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).


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  • a long time? - Ralph 11:22:38 02/09/17 (1)

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