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In Reply to: RE: 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?
Follow Ups:
I don't know where Ralph get that theory that 5 watts is not the same as 5 watts,these are factory spec.
Which resistors are you referring to?
I should dissect the faulty resistors to give an answer to your conjecture.
By the way, by replacing them with 10W ceramic ones I think that this problem will likely never happen again.
The 6SN7 driver is biased to have enough room before saturation, so I do not think it might be the culprit.
Thank you for your comments.
Best Regards
Luca
ecc230
Yes, 10 watt devices are likely indestructible :)
Now with respect to the 6080s. Everything I've seen about them indicates that they need to be preconditioned before use! So if the tubes are NOS, they should be run with filaments only for at least 72 hours. If they have already been run with B+ then its too late, but its something to keep in mind in the future.
BTW nice job on the construction!
Ralph can this..preconditioned before use....be done an then used later...or dose it have to be done right befor the b+ is added....thanks
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