Zenith 12H090

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Zenith 12H090

EdHolland
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Posts: 1,385
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Joined: Nov 2017
City: Menlo Park State, Province, Country: CA

#38

02-03-2019, 07:34 PM

Update:

I got the OPT and transformer connected OK.

She passed all the dim-bulb trials, and there was a feint scratching from the speaker with the bulb still in the line, and the rectifier connected, when the volume was rotated. At this point, only about 70 V HT was available instead of the 300+ one should get with a direct connection to the mains. So I removed the bulb tester...

Switch on.... wait... very quiet, but then a bit louder scratching... nothing more... then a whisper of static rose to audibility. We're switched to the 100 MHz FM band. Twiddle the dial. Voices, music!

She lives!

Rather distorted audio on FM, but signs of life on all bands, indicating that the oscillators all work, and the RF stages. Next stop to figure out the alignment procedure and see what improvement can be achieved.

Always a good day when a project glows back to life Icon_smile

I don't hold with furniture that talks.

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Messages In This Thread

Zenith 12H090 - by EdHolland - 05-27-2018, 03:11 AM

RE: Zenith 12H090 - by morzh - 05-27-2018, 11:30 AM

RE: Zenith 12H090 - by EdHolland - 05-27-2018, 07:54 PM

RE: Zenith 12H090 - by morzh - 05-27-2018, 11:14 PM

RE: Zenith 12H090 - by EdHolland - 05-29-2018, 01:51 PM

RE: Zenith 12H090 - by Electrothaumaturgist - 05-30-2018, 02:26 PM

RE: Zenith 12H090 - by morzh - 05-30-2018, 04:51 PM

RE: Zenith 12H090 - by Electrothaumaturgist - 05-30-2018, 06:26 PM

RE: Zenith 12H090 - by Arran - 05-31-2018, 04:42 AM

RE: Zenith 12H090 - by EdHolland - 05-31-2018, 04:08 PM

RE: Zenith 12H090 - by Electrothaumaturgist - 06-01-2018, 01:41 AM

RE: Zenith 12H090 - by Arran - 06-01-2018, 02:15 AM

RE: Zenith 12H090 - by Electrothaumaturgist - 06-01-2018, 03:39 AM

RE: Zenith 12H090 - by morzh - 06-01-2018, 07:55 AM

RE: Zenith 12H090 - by EdHolland - 06-01-2018, 12:43 PM

RE: Zenith 12H090 - by Electrothaumaturgist - 06-01-2018, 03:31 PM

RE: Zenith 12H090 - by Arran - 06-02-2018, 03:06 AM

RE: Zenith 12H090 - by Electrothaumaturgist - 06-02-2018, 05:48 AM

RE: Zenith 12H090 - by EdHolland - 10-25-2018, 11:51 PM

RE: Zenith 12H090 - by Arran - 10-27-2018, 04:09 PM

RE: Zenith 12H090 - by jcassity - 10-28-2018, 07:57 PM

RE: Zenith 12H090 - by EdHolland - 12-02-2018, 12:44 PM

RE: Zenith 12H090 - by EdHolland - 12-03-2018, 03:03 AM

RE: Zenith 12H090 - by EdHolland - 12-05-2018, 03:00 PM

RE: Zenith 12H090 - by EdHolland - 12-09-2018, 09:58 PM

RE: Zenith 12H090 - by Ron Ramirez - 12-09-2018, 11:17 PM

RE: Zenith 12H090 - by Arran - 12-10-2018, 05:34 AM

RE: Zenith 12H090 - by morzh - 12-10-2018, 09:20 AM

RE: Zenith 12H090 - by EdHolland - 12-11-2018, 02:05 PM

RE: Zenith 12H090 - by EdHolland - 12-16-2018, 11:45 PM

RE: Zenith 12H090 - by EdHolland - 01-13-2019, 09:37 PM

RE: Zenith 12H090 - by EdHolland - 01-20-2019, 11:20 PM

RE: Zenith 12H090 - by EdHolland - 01-27-2019, 10:35 PM

RE: Zenith 12H090 - by EdHolland - 02-01-2019, 05:06 PM

RE: Zenith 12H090 - by EdHolland - 02-02-2019, 10:26 PM

RE: Zenith 12H090 - by jcassity - 02-03-2019, 01:47 PM

RE: Zenith 12H090 - by EdHolland - 02-03-2019, 05:56 PM

RE: Zenith 12H090 - by EdHolland - 02-03-2019, 07:34 PM

RE: Zenith 12H090 - by jcassity - 02-04-2019, 11:55 AM

RE: Zenith 12H090 - by EdHolland - 02-04-2019, 03:29 PM

RE: Zenith 12H090 - by EdHolland - 02-08-2019, 02:37 PM

RE: Zenith 12H090 - by EdHolland - 02-09-2019, 11:17 PM

RE: Zenith 12H090 - by morzh - 02-10-2019, 11:19 AM

RE: Zenith 12H090 - by EdHolland - 02-11-2019, 04:04 PM

RE: Zenith 12H090 - by EdHolland - 02-12-2019, 01:27 PM

RE: Zenith 12H090 - by EdHolland - 02-18-2019, 02:36 PM

RE: Zenith 12H090 - by EdHolland - 02-23-2019, 03:17 AM

RE: Zenith 12H090 - by OldRestorer - 02-23-2019, 08:14 AM

RE: Zenith 12H090 - by EdHolland - 02-23-2019, 07:17 PM

RE: Zenith 12H090 - by EdHolland - 02-23-2019, 07:34 PM

RE: Zenith 12H090 - by EdHolland - 02-23-2019, 09:10 PM

RE: Zenith 12H090 - by OldRestorer - 02-24-2019, 03:02 PM

RE: Zenith 12H090 - by EdHolland - 02-25-2019, 06:34 PM

RE: Zenith 12H090 - by jcassity - 02-25-2019, 07:31 PM

RE: Zenith 12H090 - by tbone - 02-25-2019, 08:31 PM

RE: Zenith 12H090 - by Arran - 02-26-2019, 06:55 AM

RE: Zenith 12H090 - by EdHolland - 02-26-2019, 09:15 PM

RE: Zenith 12H090 - by OldRestorer - 03-19-2019, 01:01 PM

RE: Zenith 12H090 - by EdHolland - 03-19-2019, 09:36 PM

RE: Zenith 12H090 - by EdHolland - 05-26-2019, 12:46 AM

RE: Zenith 12H090 - by morzh - 05-26-2019, 08:32 AM

RE: Zenith 12H090 - by EdHolland - 05-26-2019, 10:48 AM

RE: Zenith 12H090 - by Eliot Ness - 05-26-2019, 11:11 AM

RE: Zenith 12H090 - by EdHolland - 05-26-2019, 09:22 PM

RE: Zenith 12H090 - by morzh - 05-27-2019, 10:43 AM

RE: Zenith 12H090 - by EdHolland - 05-27-2019, 11:48 AM

RE: Zenith 12H090 - by EdHolland - 01-12-2021, 08:45 PM

RE: Zenith 12H090 - by Arran - 01-13-2021, 12:31 AM

RE: Zenith 12H090 - by EdHolland - 01-13-2021, 11:33 AM

RE: Zenith 12H090 - by EdHolland - 01-16-2021, 09:58 PM

RE: Zenith 12H090 - by EdHolland - 01-21-2021, 08:25 PM

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