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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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Well I guess the filaments of at least some tubes are tougher than I thought they would be. I was trying out a different driver for the 91A and I neglected to change the filament transfo. The old driver was a 310A that needs 10v, and the new driver is a 6C6 which needs 6v for the filament.
It must have been a full 5 minutes before it dawned on me what I had done. It sounded a tad strange, but I had not heard this tube before. It was when I noticed the filaments glowing brighter that I thought they should that I yelled "oh crap!" and jumped for the variac and shut it down.
I am sure I have shortened the life expectancy of those two tubes by quite a bit, but I was truly amazed that both of them still worked fine when I hooked them up to a 6v filament transfo.
This makes me curious as to how much abuse in filament voltage the average tube filament can take. I mean that was more than 50% for Pete's sake! Does anyone know for sure?
Also, this was AC on the filaments, not DC. Does that make any difference?
Edits: 12/12/14 12/12/14
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Topic - Oops.......... - vinnie2 12:29:44 12/12/14 (9)
- RE: Oops.......... - xaudiomanx 06:53:31 12/14/14 (1)
- RE: Oops.......... - vinnie2 14:04:19 12/14/14 (0)
- RE: Oops.......... - Paul Joppa 18:41:37 12/12/14 (1)
- RE: Oops.......... - vinnie2 06:30:05 12/13/14 (0)
- RE: Oops.......... - drlowmu 15:58:11 12/12/14 (2)
- RE: Oops.......... - Triode_Kingdom 12:06:26 12/13/14 (0)
- RE: Oops.......... - vinnie2 18:10:27 12/12/14 (0)
- RE: Oops.......... - Chip647 12:42:36 12/12/14 (1)
- RE: Oops.......... - vinnie2 18:09:47 12/12/14 (0)
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