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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Will direct coupling shorting tube life?? posted by bouncy ball on May 20, 2012 at 19:04:57:
In direct coupling, it is very easy to put a high voltage on the output tube grid during the warmup transient. Some tubes are fairly tolerant of this abuse, and others are very touchy about it. I have seen tubes that withstand it for years of daily use, and tubes that die in a day. It's still abuse.
Worrying about these transients is one of the prices you pay for direct coupling. Done carefully enough, there is no reason such circuits should not have a very long tube life. I am not claiming that I have always done it carefully enough - how else would I have learned what's in the paragarph above?!
Incidentally, once the transient is eliminated, sometimes the tube's emission will come back after a few hours of running.
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Follow Ups
- RE: Will direct coupling shorting tube life?? - Paul Joppa 19:40:35 05/20/12 (3)
- RE: Will direct coupling shorting tube life?? - GTCharlie 17:23:31 05/25/12 (0)
- RE: Will direct coupling shorting tube life?? - RPMac 07:39:15 05/21/12 (1)
- RE: Will direct coupling shorting tube life?? - mikeyb 07:47:49 05/21/12 (0)
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