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42-327 heater circuit confusion
#32

The radio plays good and broadcast and shortwave stations came through, but the line voltage is still high. I tried to wire the heater circuit with the lamp wired to 7c6 as shown in the schematic but it burned up the tube so I’m back to the beginning where I’m confused about the lamp wiring into the heater string. I have a 7b6 and it worked for a quick test for reception and that checked ok. It won’t do for regular use though. I’ve ordered another tube but could really use more help in the wiring. I know the circuit as I’ve wired it pretty well and can draw my wiring but am still confused and continue tracing. The resistors that are out of specs are 1/2 watt so I can’t replace them today. Aside from the resistors being replaced I’m wondering if the heater wiring could be causing the higher B+ and that’s how I burned the 7c6 tube. Trouble reading the way the lamp drops in between 50L6 and 7C6 which are pins 2 and 8. Any suggestions?


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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