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42-327 heater circuit confusion
#37

Just wanted to post an update since the last post. I received the replacement 7C6 tube yesterday and put it in to test today. I dropped the voltage a little since it was running high and I can honestly say that it sounds great. My only concern is a grid bias for the XXD tube for 47k is missing. No note that is was used in code 121 only so I’ll probably put one in and see how it does. Like I said earlier, the voltages are a little high and that’s most everywhere I’ve checked earlier. Just going to check them again and go from there. Thanks for all the help.


Messages In This Thread
42-327 heater circuit confusion - by SlidesK - 01-21-2026, 12:31 PM
RE: 42-327 heater circuit confusion - by morzh - 01-21-2026, 05:31 PM
RE: 42-327 heater circuit confusion - by SlidesK - 01-21-2026, 06:53 PM
RE: 42-327 heater circuit confusion - by SlidesK - 01-21-2026, 07:09 PM
RE: 42-327 heater circuit confusion - by Arran - 01-21-2026, 10:50 PM
RE: 42-327 heater circuit confusion - by morzh - 01-21-2026, 11:16 PM
RE: 42-327 heater circuit confusion - by Arran - 01-22-2026, 01:25 AM
RE: 42-327 heater circuit confusion - by SlidesK - 01-22-2026, 07:02 AM
RE: 42-327 heater circuit confusion - by MrFixr55 - 01-22-2026, 07:10 AM
RE: 42-327 heater circuit confusion - by morzh - 01-22-2026, 10:00 AM
RE: 42-327 heater circuit confusion - by SlidesK - 01-22-2026, 10:34 AM
RE: 42-327 heater circuit confusion - by morzh - 01-22-2026, 10:40 AM
RE: 42-327 heater circuit confusion - by MrFixr55 - 01-22-2026, 11:19 AM
RE: 42-327 heater circuit confusion - by Arran - 01-23-2026, 01:40 AM
RE: 42-327 heater circuit confusion - by MrFixr55 - 01-23-2026, 07:41 AM
RE: 42-327 heater circuit confusion - by SlidesK - 01-23-2026, 06:25 PM
RE: 42-327 heater circuit confusion - by RodB - 01-23-2026, 09:00 PM
RE: 42-327 heater circuit confusion - by SlidesK - 01-23-2026, 09:46 PM
RE: 42-327 heater circuit confusion - by morzh - 01-23-2026, 10:07 PM
RE: 42-327 heater circuit confusion - by SlidesK - 01-23-2026, 10:34 PM
RE: 42-327 heater circuit confusion - by Arran - 01-23-2026, 10:56 PM
RE: 42-327 heater circuit confusion - by morzh - 01-23-2026, 11:27 PM
RE: 42-327 heater circuit confusion - by MrFixr55 - 01-23-2026, 11:58 PM
RE: 42-327 heater circuit confusion - by morzh - 01-24-2026, 02:39 PM
RE: 42-327 heater circuit confusion - by SlidesK - 01-26-2026, 06:09 AM
RE: 42-327 heater circuit confusion - by MrFixr55 - 01-26-2026, 10:45 AM
RE: 42-327 heater circuit confusion - by SlidesK - 01-26-2026, 12:50 PM
RE: 42-327 heater circuit confusion - by MrFixr55 - 01-26-2026, 03:01 PM
RE: 42-327 heater circuit confusion - by SlidesK - 01-26-2026, 03:24 PM
RE: 42-327 heater circuit confusion - by SlidesK - 01-26-2026, 04:28 PM
RE: 42-327 heater circuit confusion - by SlidesK - 01-27-2026, 08:52 AM
RE: 42-327 heater circuit confusion - by morzh - 01-27-2026, 10:08 AM
RE: 42-327 heater circuit confusion - by SlidesK - 01-27-2026, 11:05 AM
RE: 42-327 heater circuit confusion - by morzh - 01-27-2026, 11:19 AM
RE: 42-327 heater circuit confusion - by SlidesK - 01-27-2026, 11:30 AM
RE: 42-327 heater circuit confusion - by SlidesK - 01-31-2026, 01:54 PM
RE: 42-327 heater circuit confusion - by SlidesK - 02-04-2026, 05:32 PM
RE: 42-327 heater circuit confusion - by MrFixr55 - 02-05-2026, 08:46 AM
RE: 42-327 heater circuit confusion - by SlidesK - 02-05-2026, 10:47 AM



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