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Model 89 Cathedral
Mondial
Phorum Expert
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Posts: 1,113
Threads: 14
Joined: Feb 2013
City: Irvington, NY
#36

02-07-2014, 12:44 PM
Current draw with 18.8 V across the WW resistor is a bit high. Check to see if there is low bias voltage on the control grid of the 42 output. If the coupling cap is leaking or the 42 has excessive gas, it will cause reduced negative bias and high plate and screen current.

You should have approximately the same bias voltage from grid to cathode on the 42 as you have across the wirewound.

I just noticed you have 300V out of the field coil. This is also high. Should be about 260-270 V on the screen grid of the 42.

What is your AC line voltage? Did you increase the value of the first filter cap after the rectifier?
(This post was last modified: 02-07-2014, 12:55 PM by Mondial.)
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Model 89 Cathedral - by skyscraper - 01-07-2014, 03:03 PM
RE: Model 89 Cathedral - by Mondial - 01-07-2014, 10:37 PM
RE: Model 89 Cathedral - by skyscraper - 01-07-2014, 10:57 PM
RE: Model 89 Cathedral - by Mondial - 01-07-2014, 11:24 PM
RE: Model 89 Cathedral - by klondike98 - 01-08-2014, 08:35 AM
RE: Model 89 Cathedral - by skyscraper - 01-08-2014, 10:50 AM
RE: Model 89 Cathedral - by tab10672 - 01-08-2014, 01:58 PM
RE: Model 89 Cathedral - by skyscraper - 01-09-2014, 03:00 PM
RE: Model 89 Cathedral - by skyscraper - 01-13-2014, 12:17 PM
RE: Model 89 Cathedral - by Ron Ramirez - 01-13-2014, 04:36 PM
RE: Model 89 Cathedral - by skyscraper - 01-13-2014, 05:11 PM
RE: Model 89 Cathedral - by morzh - 01-13-2014, 05:45 PM
RE: Model 89 Cathedral - by skyscraper - 01-13-2014, 06:58 PM
RE: Model 89 Cathedral - by OldRestorer - 01-18-2014, 06:46 AM
RE: Model 89 Cathedral - by skyscraper - 01-18-2014, 11:34 PM
RE: Model 89 Cathedral - by OldRestorer - 01-19-2014, 06:19 PM
RE: Model 89 Cathedral - by skyscraper - 02-01-2014, 02:44 PM
RE: Model 89 Cathedral - by morzh - 02-01-2014, 07:21 PM
RE: Model 89 Cathedral - by klondike98 - 02-01-2014, 07:37 PM
RE: Model 89 Cathedral - by skyscraper - 02-01-2014, 09:35 PM
RE: Model 89 Cathedral - by Mondial - 02-01-2014, 10:34 PM
RE: Model 89 Cathedral - by skyscraper - 02-01-2014, 10:50 PM
RE: Model 89 Cathedral - by skyscraper - 02-04-2014, 03:44 PM
RE: Model 89 Cathedral - by morzh - 02-04-2014, 04:01 PM
RE: Model 89 Cathedral - by skyscraper - 02-04-2014, 07:28 PM
RE: Model 89 Cathedral - by Ron Ramirez - 02-05-2014, 12:20 PM
RE: Model 89 Cathedral - by skyscraper - 02-05-2014, 12:40 PM
RE: Model 89 Cathedral - by Ron Ramirez - 02-05-2014, 12:42 PM
RE: Model 89 Cathedral - by skyscraper - 02-05-2014, 12:56 PM
RE: Model 89 Cathedral - by skyscraper - 02-06-2014, 09:50 PM
RE: Model 89 Cathedral - by klondike98 - 02-06-2014, 10:44 PM
RE: Model 89 Cathedral - by skyscraper - 02-07-2014, 12:02 AM
RE: Model 89 Cathedral - by skyscraper - 02-07-2014, 11:25 AM
RE: Model 89 Cathedral - by Mondial - 02-07-2014, 11:42 AM
RE: Model 89 Cathedral - by skyscraper - 02-07-2014, 12:02 PM
RE: Model 89 Cathedral - by Mondial - 02-07-2014, 12:44 PM
RE: Model 89 Cathedral - by skyscraper - 02-07-2014, 01:42 PM
RE: Model 89 Cathedral - by Mondial - 02-07-2014, 04:11 PM
RE: Model 89 Cathedral - by skyscraper - 02-07-2014, 04:18 PM
RE: Model 89 Cathedral - by Mondial - 02-07-2014, 04:35 PM
RE: Model 89 Cathedral - by Steve Davis - 02-07-2014, 06:21 PM
RE: Model 89 Cathedral - by skyscraper - 02-07-2014, 06:49 PM
RE: Model 89 Cathedral - by skyscraper - 02-26-2014, 11:36 AM
RE: Model 89 Cathedral - by Mondial - 02-26-2014, 12:14 PM
RE: Model 89 Cathedral - by skyscraper - 02-26-2014, 12:46 PM
RE: Model 89 Cathedral - by morzh - 02-26-2014, 01:44 PM
RE: Model 89 Cathedral - by Mondial - 02-26-2014, 01:58 PM
RE: Model 89 Cathedral - by morzh - 02-26-2014, 02:14 PM
RE: Model 89 Cathedral - by skyscraper - 02-26-2014, 02:26 PM
RE: Model 89 Cathedral - by Mondial - 02-26-2014, 02:35 PM
RE: Model 89 Cathedral - by skyscraper - 02-26-2014, 02:53 PM
RE: Model 89 Cathedral - by Ron Ramirez - 02-26-2014, 07:21 PM
RE: Model 89 Cathedral - by skyscraper - 02-26-2014, 08:25 PM
RE: Model 89 Cathedral - by morzh - 02-26-2014, 09:41 PM
RE: Model 89 Cathedral - by skyscraper - 02-27-2014, 01:58 PM
RE: Model 89 Cathedral - by Mondial - 02-27-2014, 03:33 PM
RE: Model 89 Cathedral - by skyscraper - 03-02-2014, 02:32 PM
RE: Model 89 Cathedral - by Warren - 03-02-2014, 07:34 PM
RE: Model 89 Cathedral - by Mondial - 03-02-2014, 07:40 PM
RE: Model 89 Cathedral - by morzh - 03-02-2014, 07:44 PM
RE: Model 89 Cathedral - by skyscraper - 03-02-2014, 09:07 PM
RE: Model 89 Cathedral - by morzh - 03-02-2014, 09:31 PM
RE: Model 89 Cathedral - by Mondial - 03-02-2014, 11:01 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-02-2014, 11:12 PM
RE: Model 89 Cathedral - by Warren - 03-02-2014, 11:12 PM
RE: Model 89 Cathedral - by skyscraper - 03-02-2014, 11:47 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-02-2014, 11:51 PM
RE: Model 89 Cathedral - by skyscraper - 03-02-2014, 11:57 PM
RE: Model 89 Cathedral - by Mondial - 03-03-2014, 09:44 AM
RE: Model 89 Cathedral - by Ron Ramirez - 03-03-2014, 08:12 PM
RE: Model 89 Cathedral - by skyscraper - 03-03-2014, 08:46 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-03-2014, 10:48 PM
RE: Model 89 Cathedral - by skyscraper - 03-03-2014, 10:55 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-03-2014, 11:21 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-04-2014, 08:02 AM
RE: Model 89 Cathedral - by Mondial - 03-04-2014, 08:54 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-04-2014, 06:06 PM
RE: Model 89 Cathedral - by Mondial - 03-04-2014, 06:15 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-04-2014, 10:28 PM
RE: Model 89 Cathedral - by Mondial - 03-04-2014, 11:40 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-04-2014, 11:48 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-05-2014, 06:18 PM
RE: Model 89 Cathedral - by Mondial - 03-06-2014, 10:51 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-06-2014, 05:42 PM
RE: Model 89 Cathedral - by skyscraper - 03-08-2014, 08:41 PM
RE: Model 89 Cathedral - by Radioroslyn - 03-08-2014, 09:06 PM
RE: Model 89 Cathedral - by skyscraper - 03-08-2014, 09:16 PM
RE: Model 89 Cathedral - by Radioroslyn - 03-08-2014, 10:19 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-08-2014, 11:16 PM
RE: Model 89 Cathedral - by Mondial - 03-09-2014, 09:26 AM
RE: Model 89 Cathedral - by Warren - 03-09-2014, 05:11 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-09-2014, 09:22 PM
RE: Model 89 Cathedral - by Mondial - 03-10-2014, 09:25 AM
RE: Model 89 Cathedral - by skyscraper - 03-10-2014, 10:16 AM
RE: Model 89 Cathedral - by Mondial - 03-10-2014, 11:05 AM
RE: Model 89 Cathedral - by skyscraper - 03-10-2014, 11:39 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-10-2014, 12:36 PM
RE: Model 89 Cathedral - by skyscraper - 03-10-2014, 02:26 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-10-2014, 05:12 PM
RE: Model 89 Cathedral - by gregb - 03-10-2014, 05:15 PM
RE: Model 89 Cathedral - by Mondial - 03-10-2014, 07:34 PM
RE: Model 89 Cathedral - by skyscraper - 03-10-2014, 07:45 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-10-2014, 09:27 PM
RE: Model 89 Cathedral - by skyscraper - 03-10-2014, 09:36 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-10-2014, 09:48 PM
RE: Model 89 Cathedral - by Mondial - 03-10-2014, 11:05 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-11-2014, 06:53 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-11-2014, 09:53 PM
RE: Model 89 Cathedral - by gregb - 03-11-2014, 10:00 PM
RE: Model 89 Cathedral - by Mondial - 03-11-2014, 10:17 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-11-2014, 10:48 PM
RE: Model 89 Cathedral - by skyscraper - 03-11-2014, 11:22 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-12-2014, 06:54 AM
RE: Model 89 Cathedral - by Mondial - 03-12-2014, 07:15 AM
RE: Model 89 Cathedral - by skyscraper - 03-12-2014, 08:15 PM
RE: Model 89 Cathedral - by Mondial - 03-12-2014, 09:02 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-12-2014, 09:29 PM
RE: Model 89 Cathedral - by skyscraper - 03-12-2014, 09:40 PM
RE: Model 89 Cathedral - by Mondial - 03-12-2014, 09:48 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-12-2014, 09:56 PM
RE: Model 89 Cathedral - by skyscraper - 03-12-2014, 10:03 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-12-2014, 10:04 PM
RE: Model 89 Cathedral - by skyscraper - 03-12-2014, 10:06 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-12-2014, 10:08 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-12-2014, 10:10 PM
RE: Model 89 Cathedral - by skyscraper - 03-12-2014, 10:17 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-12-2014, 10:22 PM
RE: Model 89 Cathedral - by skyscraper - 03-12-2014, 10:28 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-12-2014, 10:33 PM
RE: Model 89 Cathedral - by Mondial - 03-12-2014, 10:35 PM
RE: Model 89 Cathedral - by skyscraper - 03-12-2014, 10:57 PM
RE: Model 89 Cathedral - by Ron Ramirez - 03-13-2014, 04:27 AM
RE: Model 89 Cathedral - by skyscraper - 03-13-2014, 12:44 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-13-2014, 06:37 PM
RE: Model 89 Cathedral - by Mondial - 03-13-2014, 07:14 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-13-2014, 09:12 PM
RE: Model 89 Cathedral - by skyscraper - 03-14-2014, 11:31 AM
RE: Model 89 Cathedral - by Ron Ramirez - 03-14-2014, 11:40 AM
RE: Model 89 Cathedral - by skyscraper - 03-14-2014, 11:52 AM
RE: Model 89 Cathedral - by gregb - 03-15-2014, 03:45 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-15-2014, 09:57 PM
RE: Model 89 Cathedral - by Ron Ramirez - 03-15-2014, 10:03 PM
RE: Model 89 Cathedral - by gregb - 03-15-2014, 10:13 PM
RE: Model 89 Cathedral - by Ron Ramirez - 03-15-2014, 10:14 PM
RE: Model 89 Cathedral - by gregb - 03-15-2014, 10:38 PM
RE: Model 89 Cathedral - by Ron Ramirez - 03-16-2014, 08:54 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-16-2014, 10:29 AM
RE: Model 89 Cathedral - by skyscraper - 03-16-2014, 12:57 PM
RE: Model 89 Cathedral - by gregb - 03-16-2014, 01:15 PM
RE: Model 89 Cathedral - by skyscraper - 03-17-2014, 01:30 PM
RE: Model 89 Cathedral - by skyscraper - 03-24-2014, 03:25 PM
RE: Model 89 Cathedral - by morzh - 03-24-2014, 03:41 PM
RE: Model 89 Cathedral - by gregb - 03-24-2014, 03:53 PM
RE: Model 89 Cathedral - by skyscraper - 03-24-2014, 03:59 PM
RE: Model 89 Cathedral - by gregb - 03-24-2014, 04:07 PM
RE: Model 89 Cathedral - by skyscraper - 03-24-2014, 04:12 PM
RE: Model 89 Cathedral - by gregb - 03-24-2014, 04:14 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-24-2014, 06:07 PM
RE: Model 89 Cathedral - by gregb - 03-24-2014, 06:19 PM
RE: Model 89 Cathedral - by morzh - 03-24-2014, 06:21 PM
RE: Model 89 Cathedral - by skyscraper - 03-24-2014, 06:26 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-24-2014, 06:32 PM
RE: Model 89 Cathedral - by skyscraper - 03-24-2014, 06:35 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-24-2014, 06:42 PM
RE: Model 89 Cathedral - by skyscraper - 03-26-2014, 09:40 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-26-2014, 07:51 PM
RE: Model 89 Cathedral - by skyscraper - 03-26-2014, 08:49 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-26-2014, 09:50 PM
RE: Model 89 Cathedral - by skyscraper - 03-26-2014, 10:04 PM
RE: Model 89 Cathedral - by TV MAN - 03-27-2014, 12:26 PM
RE: Model 89 Cathedral - by skyscraper - 03-27-2014, 01:34 PM
RE: Model 89 Cathedral - by BrendaAnnD - 03-27-2014, 02:39 PM
RE: Model 89 Cathedral - by gregb - 03-27-2014, 02:44 PM
RE: Model 89 Cathedral - by PAradiogeek - 03-27-2014, 02:50 PM



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