Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x


42-327 heater circuit confusion
#34

Hi morph, by line voltage I meant B+ the input is 117v AC and the B+ was measuring 122v down from 130v after replacing a missing wire that I took out due to crumbling. That put a 10k back into the 1st AF/ Det circuit diode plate. Now it’s wired as it was before I tried to put the lamp in at pin 8 of 7C6 which burned the filament. I then put in a 7B6 for a quick check. Checking now B+ is 122vdc on one side of the field, the output side and 95vdc on the rect cathode side. Should be 108 and 83 vdc
The 7B6 is very temporary and reads 81vdc at the plate which should be 28vdc with the 7C6 which I have ordered and won’t receive for a few days. I have studied electronics with a BS in Engineering Physics/ Electronics. Radio tube theory is still a new study to me so I’m stumbling through since I’ve been away from electronics theory and application for almost 20 years. It’s coming back but appreciate all the help I can get.


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



Users browsing this thread: 5 Guest(s)
[-]
Recent Posts
Plug Voltages Needed For A 1943 CRV-20130 Power Supply
Try looking at this site the book mark is for a old generator that I was given. David    https://radionerds.com/index.ph...David — 08:36 PM
Plug Voltages Needed For A 1943 CRV-20130 Power Supply
Hello Everyone, I am looking for voltage identification for all the pin positions on the socket of a CRV-20130 power su...Tonym4704 — 08:16 PM
Philco P45-6365 Universal Transformer Instruction Manual
Can anyone guide me to where this may be found?GRG — 03:00 PM
54C Complete Teardown/Rebuild
I don't think that I have encountered a 12Z3 before, curious how it uses one of those but includes a #43, which is a 25 ...Arran — 02:17 PM
HiFi (Chifi) tube amp build - but my own design.
It's the other forum. I'm also in DIY, but mostly read there. Honestly, I kinda jumped into this without much thought to...TV MAN — 10:43 AM
Philco 71 Code 125
Hello,  I am in need of a schematic for this radio. Mine has the three separate circular tube shields and a shadow me...dconant — 08:06 AM
Stromberg Carlson 1500 Squeal
And life just keeps getting more complicated.dconant — 07:57 AM
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM

[-]
Who's Online
There are currently no members online.

>