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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Tube life considerations. tt verses oxide posted by amnesiac on August 7, 2017 at 05:17:49:
It's important to understand that the 10,000 hour rating for the C3M is more of a minimum rating.
Some time ago, I built a pair of single ended EL34 amps for my father's TV rig. I never turned them off and I found that in that amp, the 6SN7's didn't really seem to show any wear, nor did the 5U4's. The Russian EL34's lasted about two years in constant service before getting flat and showing low emissions. Chinese EL34's went about 7 months. Fancy reissue GL KT88's went gassy in 3 months.
Tube life depends a lot on operating voltages and heat cycling. I could make you a 300B amp that would eat 300B's (run the filaments at 5.5V and plates at 40W dissipation) or would make them last for ages (run the filaments at 4.9V, plate dissipation at 25W). Unfortunately the average consumer will buy a 9W amp over a 7W amp and the finals will suffer.
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Follow Ups
- RE: Tube life considerations. tt verses oxide - Caucasian Blackplate 10:22:05 08/07/17 (2)
- RE: Tube life considerations. tt verses oxide - amnesiac 10:12:44 08/08/17 (1)
- RE: Tube life considerations. tt verses oxide - Caucasian Blackplate 10:54:24 08/08/17 (0)
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