New silicon diode, no sound - ToddM

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New silicon diode, no sound

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Posted by ToddM on July 26, 2002 at 06:09:14

Ha!~ I thought I was finished, but they just keep pullling me back in ... last night, I "completed" the minimal refurb of my Heathkit (aa-121, el-34-based pp amp) by dropping in the much-ballyhooed ssilicon diode to replace the selenium bias rectifier. The voltage was a bit high, so I put a 50-ohm sand resistor in series after the Si diode. It knocked the v down to about 55 (from 57); the schematic says 48 V. The *real* problem, though, is that while the new bias, et al., caps made a real improvement in quietness and hum, apparently the Si diode takes it light-years further, because now there is no output at all, even if I turn the "volume" knobs all the way up (except from the "a" channel TUBES). Bias voltage and balance are steady and right on target (1.5v and 0v, respectively, in both channels). I've got new tubes (Ei) arriving today , but what else could it be? - I can't find a signal loss anywhere, but maybe that's just the 11 pm talking ...

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Topic - New silicon diode, no sound - ToddM 06:09:14 07/26/02 (18)

New silicon diode, full sound - ToddM 07:57:32 07/31/02 (0)

Re: New silicon diode, no sound - TnT 03:04:09 07/28/02 (2)

Re: New silicon diode, no sound - Damir 03:45:30 07/28/02 (1)

Re: New silicon diode, no sound - TnT 00:38:56 07/29/02 (0)

Re: New silicon diode, no sound - steven oda 07:45:23 07/26/02 (13)

Re: New silicon diode, no sound - ToddM 09:24:56 07/26/02 (12)

Re: New silicon diode, no sound - Damir 10:14:35 07/26/02 (11)

Re: New silicon diode, no sound - steven oda 10:37:36 07/26/02 (1)

Nevermind (for those Nirvana fans) - steven oda 10:48:07 07/26/02 (0)

Re: New silicon diode, no sound - ToddM 10:27:09 07/26/02 (8)

Re: New silicon diode, no sound - Damir 12:00:06 07/26/02 (1)

thanks - I'll check - ToddM 12:39:06 07/26/02 (0)

Band - steven oda 10:42:10 07/26/02 (5)

Re: Band - mutescream 12:13:58 07/26/02 (0)

yep ... - ToddM 11:44:29 07/26/02 (3)

Re: yep ... - steven oda 12:35:51 07/26/02 (2)

Screen resistor - steven oda 12:47:23 07/26/02 (0)

whew - glad my in-laws are in town ... - ToddM 12:44:57 07/26/02 (0)

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