C22 McIntosh preamp

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C22 McIntosh preamp

MrFixr55
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#11

05-02-2026, 10:55 PM

Yeah, wonder why they did that. True, they had some DC available to do that, but was copper all that expensive back then to save 18VDC net on the AC required of the B Supply?

It seems that voltage doublers for B+ became popular sometime in the 60s for TV. Seen it on a few Zenith color sets and others with solid state diode rectifiers, transformer or not. My Heath WA-6M Power Amp has one.

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Messages In This Thread

C22 McIntosh preamp - by morzh - 04-14-2026, 09:32 PM

RE: C22 McIntosh preamp - by radiorich - 04-14-2026, 10:57 PM

RE: C22 McIntosh preamp - by Arran - 04-14-2026, 11:25 PM

RE: C22 McIntosh preamp - by MrFixr55 - 04-15-2026, 08:00 AM

RE: C22 McIntosh preamp - by morzh - 04-15-2026, 08:55 AM

RE: C22 McIntosh preamp - by morzh - 04-17-2026, 08:47 PM

RE: C22 McIntosh preamp - by radiorich - 04-21-2026, 08:41 AM

RE: C22 McIntosh preamp - by morzh - 04-21-2026, 11:04 AM

RE: C22 McIntosh preamp - by TV MAN - 04-27-2026, 04:28 PM

RE: C22 McIntosh preamp - by morzh - 05-02-2026, 08:33 PM

RE: C22 McIntosh preamp - by MrFixr55 - 05-02-2026, 10:55 PM

RE: C22 McIntosh preamp - by morzh - 05-03-2026, 10:33 AM

RE: C22 McIntosh preamp - by morzh - 05-03-2026, 08:48 PM

RE: C22 McIntosh preamp - by radiorich - 05-12-2026, 10:36 PM

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