Questions about tubes and gear that glows. FAQ
In Reply to: Hot spots on 6V6 plates posted by Alpha Al on June 8, 2017 at 10:19:40:
It should help by virtue of its higher voltage drop resulting in a little less voltage but i still think you nee to make changes to have the B+ below 400vdc. the GE tube manual for the 6V6GT shows recommended voltages of 285vdc in pp class ab. Of course the amp makers would "ignore" these recommendations and push the tubes to very limit. It is interesting to note that the characteristic curves in the GE manual show no points pass 400vdc!
This is not the case for 6V6GTA tubes for which the characteristic curves are plootted to 500vdc. So, you can try the GTA or 7408 tubes which have higher ratings and maybe ok in your unit but seriously, your B+ needs to be lowered with a dropping resistor or choke or a bucking transformer.
6V6GT is not designed for 450vdc plate voltages.
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Topic - Hot spots on 6V6 plates - Alpha Al 10:19:40 06/08/17 (17)
- Try a 5r4 rectifier - DAK 13:53:08 06/08/17 (2)
- RE: Try a 5r4 rectifier - Alpha Al 15:05:52 06/08/17 (1)
- RE: On the other hand.... - DAK 22:08:47 06/08/17 (0)
- RE: Hot spots on 6V6 plates - 6bq5 13:28:25 06/08/17 (0)
- RE: 450v plate and screen? - DAK 10:55:09 06/08/17 (12)
- RE: 450v plate and screen? - Alpha Al 11:25:37 06/08/17 (11)
- RE: 450v plate and screen? - kmolles 15:23:28 06/08/17 (0)
- RE: 450v plate and screen? - Jim McShane 13:39:35 06/08/17 (9)
- RE: 450v plate and screen? - Alpha Al 13:56:49 06/08/17 (8)
- RE: 450v plate and screen? - Tre' 18:49:07 06/08/17 (3)
- RE: 450v plate and screen? - Alpha Al 07:57:11 06/09/17 (2)
- RE: 450v plate and screen? - Jim McShane 14:21:23 06/08/17 (3)