1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration
Thread Rating:
  • 1 Vote(s) - 5 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Linear Mode
Model 89 Cathedral
Mondial
Phorum Expert
*****
Posts: 1,114
Threads: 14
Joined: Feb 2013
City: Irvington, NY
#36

02-07-2014, 01:44 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, 01:55 PM by Mondial.)
Find
« Next Oldest | Next Newest »


Messages In This Thread
Model 89 Cathedral - by skyscraper - 01-07-2014, 04:03 PM
RE: Model 89 Cathedral - by Mondial - 01-07-2014, 11:37 PM
RE: Model 89 Cathedral - by skyscraper - 01-07-2014, 11:57 PM
RE: Model 89 Cathedral - by Mondial - 01-08-2014, 12:24 AM
RE: Model 89 Cathedral - by klondike98 - 01-08-2014, 09:35 AM
RE: Model 89 Cathedral - by skyscraper - 01-08-2014, 11:50 AM
RE: Model 89 Cathedral - by tab10672 - 01-08-2014, 02:58 PM
RE: Model 89 Cathedral - by skyscraper - 01-09-2014, 04:00 PM
RE: Model 89 Cathedral - by skyscraper - 01-13-2014, 01:17 PM
RE: Model 89 Cathedral - by Ron Ramirez - 01-13-2014, 05:36 PM
RE: Model 89 Cathedral - by skyscraper - 01-13-2014, 06:11 PM
RE: Model 89 Cathedral - by morzh - 01-13-2014, 06:45 PM
RE: Model 89 Cathedral - by skyscraper - 01-13-2014, 07:58 PM
RE: Model 89 Cathedral - by OldRestorer - 01-18-2014, 07:46 AM
RE: Model 89 Cathedral - by skyscraper - 01-19-2014, 12:34 AM
RE: Model 89 Cathedral - by OldRestorer - 01-19-2014, 07:19 PM
RE: Model 89 Cathedral - by skyscraper - 02-01-2014, 03:44 PM
RE: Model 89 Cathedral - by morzh - 02-01-2014, 08:21 PM
RE: Model 89 Cathedral - by klondike98 - 02-01-2014, 08:37 PM
RE: Model 89 Cathedral - by skyscraper - 02-01-2014, 10:35 PM
RE: Model 89 Cathedral - by Mondial - 02-01-2014, 11:34 PM
RE: Model 89 Cathedral - by skyscraper - 02-01-2014, 11:50 PM
RE: Model 89 Cathedral - by skyscraper - 02-04-2014, 04:44 PM
RE: Model 89 Cathedral - by morzh - 02-04-2014, 05:01 PM
RE: Model 89 Cathedral - by skyscraper - 02-04-2014, 08:28 PM
RE: Model 89 Cathedral - by Ron Ramirez - 02-05-2014, 01:20 PM
RE: Model 89 Cathedral - by skyscraper - 02-05-2014, 01:40 PM
RE: Model 89 Cathedral - by Ron Ramirez - 02-05-2014, 01:42 PM
RE: Model 89 Cathedral - by skyscraper - 02-05-2014, 01:56 PM
RE: Model 89 Cathedral - by skyscraper - 02-06-2014, 10:50 PM
RE: Model 89 Cathedral - by klondike98 - 02-06-2014, 11:44 PM
RE: Model 89 Cathedral - by skyscraper - 02-07-2014, 01:02 AM
RE: Model 89 Cathedral - by skyscraper - 02-07-2014, 12:25 PM
RE: Model 89 Cathedral - by Mondial - 02-07-2014, 12:42 PM
RE: Model 89 Cathedral - by skyscraper - 02-07-2014, 01:02 PM
RE: Model 89 Cathedral - by Mondial - 02-07-2014, 01:44 PM
RE: Model 89 Cathedral - by skyscraper - 02-07-2014, 02:42 PM
RE: Model 89 Cathedral - by Mondial - 02-07-2014, 05:11 PM
RE: Model 89 Cathedral - by skyscraper - 02-07-2014, 05:18 PM
RE: Model 89 Cathedral - by Mondial - 02-07-2014, 05:35 PM
RE: Model 89 Cathedral - by Steve Davis - 02-07-2014, 07:21 PM
RE: Model 89 Cathedral - by skyscraper - 02-07-2014, 07:49 PM
RE: Model 89 Cathedral - by skyscraper - 02-26-2014, 12:36 PM
RE: Model 89 Cathedral - by Mondial - 02-26-2014, 01:14 PM
RE: Model 89 Cathedral - by skyscraper - 02-26-2014, 01:46 PM
RE: Model 89 Cathedral - by morzh - 02-26-2014, 02:44 PM
RE: Model 89 Cathedral - by Mondial - 02-26-2014, 02:58 PM
RE: Model 89 Cathedral - by morzh - 02-26-2014, 03:14 PM
RE: Model 89 Cathedral - by skyscraper - 02-26-2014, 03:26 PM
RE: Model 89 Cathedral - by Mondial - 02-26-2014, 03:35 PM
RE: Model 89 Cathedral - by skyscraper - 02-26-2014, 03:53 PM
RE: Model 89 Cathedral - by Ron Ramirez - 02-26-2014, 08:21 PM
RE: Model 89 Cathedral - by skyscraper - 02-26-2014, 09:25 PM
RE: Model 89 Cathedral - by morzh - 02-26-2014, 10:41 PM
RE: Model 89 Cathedral - by skyscraper - 02-27-2014, 02:58 PM
RE: Model 89 Cathedral - by Mondial - 02-27-2014, 04:33 PM
RE: Model 89 Cathedral - by skyscraper - 03-02-2014, 03:32 PM
RE: Model 89 Cathedral - by Warren - 03-02-2014, 08:34 PM
RE: Model 89 Cathedral - by Mondial - 03-02-2014, 08:40 PM
RE: Model 89 Cathedral - by morzh - 03-02-2014, 08:44 PM
RE: Model 89 Cathedral - by skyscraper - 03-02-2014, 10:07 PM
RE: Model 89 Cathedral - by morzh - 03-02-2014, 10:31 PM
RE: Model 89 Cathedral - by Mondial - 03-03-2014, 12:01 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-03-2014, 12:12 AM
RE: Model 89 Cathedral - by Warren - 03-03-2014, 12:12 AM
RE: Model 89 Cathedral - by skyscraper - 03-03-2014, 12:47 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-03-2014, 12:51 AM
RE: Model 89 Cathedral - by skyscraper - 03-03-2014, 12:57 AM
RE: Model 89 Cathedral - by Mondial - 03-03-2014, 10:44 AM
RE: Model 89 Cathedral - by Ron Ramirez - 03-03-2014, 09:12 PM
RE: Model 89 Cathedral - by skyscraper - 03-03-2014, 09:46 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-03-2014, 11:48 PM
RE: Model 89 Cathedral - by skyscraper - 03-03-2014, 11:55 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-04-2014, 12:21 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-04-2014, 09:02 AM
RE: Model 89 Cathedral - by Mondial - 03-04-2014, 09:54 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-04-2014, 07:06 PM
RE: Model 89 Cathedral - by Mondial - 03-04-2014, 07:15 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-04-2014, 11:28 PM
RE: Model 89 Cathedral - by Mondial - 03-05-2014, 12:40 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-05-2014, 12:48 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-05-2014, 07:18 PM
RE: Model 89 Cathedral - by Mondial - 03-06-2014, 11:51 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-06-2014, 06:42 PM
RE: Model 89 Cathedral - by skyscraper - 03-08-2014, 09:41 PM
RE: Model 89 Cathedral - by Radioroslyn - 03-08-2014, 10:06 PM
RE: Model 89 Cathedral - by skyscraper - 03-08-2014, 10:16 PM
RE: Model 89 Cathedral - by Radioroslyn - 03-08-2014, 11:19 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-09-2014, 12:16 AM
RE: Model 89 Cathedral - by Mondial - 03-09-2014, 10:26 AM
RE: Model 89 Cathedral - by Warren - 03-09-2014, 06:11 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-09-2014, 10:22 PM
RE: Model 89 Cathedral - by Mondial - 03-10-2014, 10:25 AM
RE: Model 89 Cathedral - by skyscraper - 03-10-2014, 11:16 AM
RE: Model 89 Cathedral - by Mondial - 03-10-2014, 12:05 PM
RE: Model 89 Cathedral - by skyscraper - 03-10-2014, 12:39 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-10-2014, 01:36 PM
RE: Model 89 Cathedral - by skyscraper - 03-10-2014, 03:26 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-10-2014, 06:12 PM
RE: Model 89 Cathedral - by gregb - 03-10-2014, 06:15 PM
RE: Model 89 Cathedral - by Mondial - 03-10-2014, 08:34 PM
RE: Model 89 Cathedral - by skyscraper - 03-10-2014, 08:45 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-10-2014, 10:27 PM
RE: Model 89 Cathedral - by skyscraper - 03-10-2014, 10:36 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-10-2014, 10:48 PM
RE: Model 89 Cathedral - by Mondial - 03-11-2014, 12:05 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-11-2014, 07:53 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-11-2014, 10:53 PM
RE: Model 89 Cathedral - by gregb - 03-11-2014, 11:00 PM
RE: Model 89 Cathedral - by Mondial - 03-11-2014, 11:17 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-11-2014, 11:48 PM
RE: Model 89 Cathedral - by skyscraper - 03-12-2014, 12:22 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-12-2014, 07:54 AM
RE: Model 89 Cathedral - by Mondial - 03-12-2014, 08:15 AM
RE: Model 89 Cathedral - by skyscraper - 03-12-2014, 09:15 PM
RE: Model 89 Cathedral - by Mondial - 03-12-2014, 10:02 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-12-2014, 10:29 PM
RE: Model 89 Cathedral - by skyscraper - 03-12-2014, 10:40 PM
RE: Model 89 Cathedral - by Mondial - 03-12-2014, 10:48 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-12-2014, 10:56 PM
RE: Model 89 Cathedral - by skyscraper - 03-12-2014, 11:03 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-12-2014, 11:04 PM
RE: Model 89 Cathedral - by skyscraper - 03-12-2014, 11:06 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-12-2014, 11:08 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-12-2014, 11:10 PM
RE: Model 89 Cathedral - by skyscraper - 03-12-2014, 11:17 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-12-2014, 11:22 PM
RE: Model 89 Cathedral - by skyscraper - 03-12-2014, 11:28 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-12-2014, 11:33 PM
RE: Model 89 Cathedral - by Mondial - 03-12-2014, 11:35 PM
RE: Model 89 Cathedral - by skyscraper - 03-12-2014, 11:57 PM
RE: Model 89 Cathedral - by Ron Ramirez - 03-13-2014, 05:27 AM
RE: Model 89 Cathedral - by skyscraper - 03-13-2014, 01:44 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-13-2014, 07:37 PM
RE: Model 89 Cathedral - by Mondial - 03-13-2014, 08:14 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-13-2014, 10:12 PM
RE: Model 89 Cathedral - by skyscraper - 03-14-2014, 12:31 PM
RE: Model 89 Cathedral - by Ron Ramirez - 03-14-2014, 12:40 PM
RE: Model 89 Cathedral - by skyscraper - 03-14-2014, 12:52 PM
RE: Model 89 Cathedral - by gregb - 03-15-2014, 04:45 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-15-2014, 10:57 PM
RE: Model 89 Cathedral - by Ron Ramirez - 03-15-2014, 11:03 PM
RE: Model 89 Cathedral - by gregb - 03-15-2014, 11:13 PM
RE: Model 89 Cathedral - by Ron Ramirez - 03-15-2014, 11:14 PM
RE: Model 89 Cathedral - by gregb - 03-15-2014, 11:38 PM
RE: Model 89 Cathedral - by Ron Ramirez - 03-16-2014, 09:54 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-16-2014, 11:29 AM
RE: Model 89 Cathedral - by skyscraper - 03-16-2014, 01:57 PM
RE: Model 89 Cathedral - by gregb - 03-16-2014, 02:15 PM
RE: Model 89 Cathedral - by skyscraper - 03-17-2014, 02:30 PM
RE: Model 89 Cathedral - by skyscraper - 03-24-2014, 04:25 PM
RE: Model 89 Cathedral - by morzh - 03-24-2014, 04:41 PM
RE: Model 89 Cathedral - by gregb - 03-24-2014, 04:53 PM
RE: Model 89 Cathedral - by skyscraper - 03-24-2014, 04:59 PM
RE: Model 89 Cathedral - by gregb - 03-24-2014, 05:07 PM
RE: Model 89 Cathedral - by skyscraper - 03-24-2014, 05:12 PM
RE: Model 89 Cathedral - by gregb - 03-24-2014, 05:14 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-24-2014, 07:07 PM
RE: Model 89 Cathedral - by gregb - 03-24-2014, 07:19 PM
RE: Model 89 Cathedral - by morzh - 03-24-2014, 07:21 PM
RE: Model 89 Cathedral - by skyscraper - 03-24-2014, 07:26 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-24-2014, 07:32 PM
RE: Model 89 Cathedral - by skyscraper - 03-24-2014, 07:35 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-24-2014, 07:42 PM
RE: Model 89 Cathedral - by skyscraper - 03-26-2014, 10:40 AM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-26-2014, 08:51 PM
RE: Model 89 Cathedral - by skyscraper - 03-26-2014, 09:49 PM
RE: Model 89 Cathedral - by NostalgiaRadioTime - 03-26-2014, 10:50 PM
RE: Model 89 Cathedral - by skyscraper - 03-26-2014, 11:04 PM
RE: Model 89 Cathedral - by TV MAN - 03-27-2014, 01:26 PM
RE: Model 89 Cathedral - by skyscraper - 03-27-2014, 02:34 PM
RE: Model 89 Cathedral - by BrendaAnnD - 03-27-2014, 03:39 PM
RE: Model 89 Cathedral - by gregb - 03-27-2014, 03:44 PM
RE: Model 89 Cathedral - by PAradiogeek - 03-27-2014, 03:50 PM



Users browsing this thread: 51 Guest(s)
[-]
Recent Posts
HiFi (Chifi) tube amp build - but my own design.
Tim Well...a chassis is metal. Magnetic or not, it does not matter. A transformer has some hum to it. It is natural....morzh — 08:40 PM
Shadow Meter Bulb
Ross I am not sure what current limiting effect the incandescent provides. They are two different parts of the sch...morzh — 08:31 PM
12' Philco
Bob Thanks for that photo. I have been looking for it, and I cannot find anythinmg on the web. I forgot it was here...morzh — 08:29 PM
Shadow Meter Bulb
I think after all has been said, I will use the same bulb that is specified for the dial pilot light which is a #55. I ...georgetownjohn — 07:31 PM
12' Philco
There was also this Philco! klondike98 — 07:25 PM
HiFi (Chifi) tube amp build - but my own design.
I expected a challenge and this is just part of it. But, it's also supposed to be fun, entertaining, informative and enj...TV MAN — 07:12 PM
Shadow Meter Bulb
Butting in here with a question. Since the shadow meter is connected directly to the 1st and 2nd I.F.'s wouldn't the met...RossH — 06:43 PM
HiFi (Chifi) tube amp build - but my own design.
Mike, Tim; you are about to enter the twilight zone. Doo doo doo doo, doo doo doo doo This is something alright. I'm go...RodB — 06:26 PM
HiFi (Chifi) tube amp build - but my own design.
:lol: We need to start a singing radio group! I play the guitar, so maybe get a few vocals? Anyways, Mike, I did try mou...TV MAN — 05:56 PM
HiFi (Chifi) tube amp build - but my own design.
And so does a barber shop quartet. mmmmmmRodB — 03:54 PM

[-]
Who's Online
There are currently 6598 online users. [Complete List]
» 2 Member(s) | 6596 Guest(s)
AvatarAvatar

>
  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration