In Reply to: Strange failure mode of cathode resistors posted by 6AS7_6SN7 on May 20, 2012 at 01:19:14:
You certainly were not using wire-wound resistors! So With heating their value drifted without the part otherwise showing signs of damage.
A 5 watt minimum wire-wound is recommended to survive arc-over events.
I would expect more than just 8 watts from that many tubes! Are you having saturation problems in the driver circuit?
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Follow Ups
- RE: Strange failure mode of cathode resistors - Ralph 09:43:09 05/21/12 (6)
- RE: Strange failure mode of cathode resistors - MERCURY 4747 18:39:43 05/30/12 (1)
- RE: Strange failure mode of cathode resistors - Ralph 13:39:56 05/31/12 (0)
- RE: Strange failure mode of cathode resistors - 6AS7_6SN7 11:09:00 05/21/12 (3)
- RE: Strange failure mode of cathode resistors - Ralph 12:09:29 05/21/12 (2)
- RE: Strange failure mode of cathode resistors - tyu 11:51:26 05/22/12 (1)
- done and used anytime later nt - Ralph 13:19:49 05/22/12 (0)