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Zenith 12H090
#30

Busy day on the radio bench today. I peeled open the big 40 uF + 40 uF filter cap, and spent an unhappy while unstuffing the can. Unlike the last one I did, this cap was packed in super tight - it makes me wonder how they got all the gubbins in there! Then some time wondering how to bring the connections out through the base. I thought I had a really good idea, which resulted in breaking out one of the tags. This was put straight, but then time was needed to let epoxy adhesive set.

With that, I pulled out the main chassis, and started to look. Oh dear, that wiring to the magic eye valve looks hideous even on the top side. Out with the notebook and record the wiring details. Accessibility on this chassis is very tricky in some places. Anyway, I found a way to get each wire desoldered, and tacked its replacement on to the end, so that I could pull the new run through. Most lines had to pass through a shield under the chassis, and this was a good way to avoid threading from scratch. All done

Then on to the wiring out to the tone selection switches. This proves to be a bit confusing - how to get to the solder joints in the switch mechanism? eventually I find that the tag board can be slid out from the button mechanism. Time to stop, but these will be rewired next session.

After that, it is paper cap replacement time, possibly also more under chassis wiring.

I don't hold with furniture that talks.


Messages In This Thread
Zenith 12H090 - by EdHolland - 05-27-2018, 02:11 AM
RE: Zenith 12H090 - by morzh - 05-27-2018, 10:30 AM
RE: Zenith 12H090 - by EdHolland - 05-27-2018, 06:54 PM
RE: Zenith 12H090 - by morzh - 05-27-2018, 10:14 PM
RE: Zenith 12H090 - by EdHolland - 05-29-2018, 12:51 PM
RE: Zenith 12H090 - by Electrothaumaturgist - 05-30-2018, 01:26 PM
RE: Zenith 12H090 - by morzh - 05-30-2018, 03:51 PM
RE: Zenith 12H090 - by Electrothaumaturgist - 05-30-2018, 05:26 PM
RE: Zenith 12H090 - by Arran - 05-31-2018, 03:42 AM
RE: Zenith 12H090 - by EdHolland - 05-31-2018, 03:08 PM
RE: Zenith 12H090 - by Electrothaumaturgist - 06-01-2018, 12:41 AM
RE: Zenith 12H090 - by Arran - 06-01-2018, 01:15 AM
RE: Zenith 12H090 - by Electrothaumaturgist - 06-01-2018, 02:39 AM
RE: Zenith 12H090 - by morzh - 06-01-2018, 06:55 AM
RE: Zenith 12H090 - by EdHolland - 06-01-2018, 11:43 AM
RE: Zenith 12H090 - by Electrothaumaturgist - 06-01-2018, 02:31 PM
RE: Zenith 12H090 - by Arran - 06-02-2018, 02:06 AM
RE: Zenith 12H090 - by Electrothaumaturgist - 06-02-2018, 04:48 AM
RE: Zenith 12H090 - by EdHolland - 10-25-2018, 10:51 PM
RE: Zenith 12H090 - by Arran - 10-27-2018, 03:09 PM
RE: Zenith 12H090 - by jcassity - 10-28-2018, 06:57 PM
RE: Zenith 12H090 - by EdHolland - 12-02-2018, 11:44 AM
RE: Zenith 12H090 - by EdHolland - 12-03-2018, 02:03 AM
RE: Zenith 12H090 - by EdHolland - 12-05-2018, 02:00 PM
RE: Zenith 12H090 - by EdHolland - 12-09-2018, 08:58 PM
RE: Zenith 12H090 - by Ron Ramirez - 12-09-2018, 10:17 PM
RE: Zenith 12H090 - by Arran - 12-10-2018, 04:34 AM
RE: Zenith 12H090 - by morzh - 12-10-2018, 08:20 AM
RE: Zenith 12H090 - by EdHolland - 12-11-2018, 01:05 PM
RE: Zenith 12H090 - by EdHolland - 12-16-2018, 10:45 PM
RE: Zenith 12H090 - by EdHolland - 01-13-2019, 08:37 PM
RE: Zenith 12H090 - by EdHolland - 01-20-2019, 10:20 PM
RE: Zenith 12H090 - by EdHolland - 01-27-2019, 09:35 PM
RE: Zenith 12H090 - by EdHolland - 02-01-2019, 04:06 PM
RE: Zenith 12H090 - by EdHolland - 02-02-2019, 09:26 PM
RE: Zenith 12H090 - by jcassity - 02-03-2019, 12:47 PM
RE: Zenith 12H090 - by EdHolland - 02-03-2019, 04:56 PM
RE: Zenith 12H090 - by EdHolland - 02-03-2019, 06:34 PM
RE: Zenith 12H090 - by jcassity - 02-04-2019, 10:55 AM
RE: Zenith 12H090 - by EdHolland - 02-04-2019, 02:29 PM
RE: Zenith 12H090 - by EdHolland - 02-08-2019, 01:37 PM
RE: Zenith 12H090 - by EdHolland - 02-09-2019, 10:17 PM
RE: Zenith 12H090 - by morzh - 02-10-2019, 10:19 AM
RE: Zenith 12H090 - by EdHolland - 02-11-2019, 03:04 PM
RE: Zenith 12H090 - by EdHolland - 02-12-2019, 12:27 PM
RE: Zenith 12H090 - by EdHolland - 02-18-2019, 01:36 PM
RE: Zenith 12H090 - by EdHolland - 02-23-2019, 02:17 AM
RE: Zenith 12H090 - by OldRestorer - 02-23-2019, 07:14 AM
RE: Zenith 12H090 - by EdHolland - 02-23-2019, 06:17 PM
RE: Zenith 12H090 - by EdHolland - 02-23-2019, 06:34 PM
RE: Zenith 12H090 - by EdHolland - 02-23-2019, 08:10 PM
RE: Zenith 12H090 - by OldRestorer - 02-24-2019, 02:02 PM
RE: Zenith 12H090 - by EdHolland - 02-25-2019, 05:34 PM
RE: Zenith 12H090 - by jcassity - 02-25-2019, 06:31 PM
RE: Zenith 12H090 - by tbone - 02-25-2019, 07:31 PM
RE: Zenith 12H090 - by Arran - 02-26-2019, 05:55 AM
RE: Zenith 12H090 - by EdHolland - 02-26-2019, 08:15 PM
RE: Zenith 12H090 - by OldRestorer - 03-19-2019, 12:01 PM
RE: Zenith 12H090 - by EdHolland - 03-19-2019, 08:36 PM
RE: Zenith 12H090 - by EdHolland - 05-25-2019, 11:46 PM
RE: Zenith 12H090 - by morzh - 05-26-2019, 07:32 AM
RE: Zenith 12H090 - by EdHolland - 05-26-2019, 09:48 AM
RE: Zenith 12H090 - by Eliot Ness - 05-26-2019, 10:11 AM
RE: Zenith 12H090 - by EdHolland - 05-26-2019, 08:22 PM
RE: Zenith 12H090 - by morzh - 05-27-2019, 09:43 AM
RE: Zenith 12H090 - by EdHolland - 05-27-2019, 10:48 AM
RE: Zenith 12H090 - by EdHolland - 01-12-2021, 07:45 PM
RE: Zenith 12H090 - by Arran - 01-12-2021, 11:31 PM
RE: Zenith 12H090 - by EdHolland - 01-13-2021, 10:33 AM
RE: Zenith 12H090 - by EdHolland - 01-16-2021, 08:58 PM
RE: Zenith 12H090 - by EdHolland - 01-21-2021, 07:25 PM



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