Philco 39-30 restoration

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Philco 39-30 restoration

Bob Andersen
Phorum Expert

Posts: 797
Threads: 42
Joined: Dec 2008
City: Chicago, IL

#21

02-27-2012, 01:20 AM

I couldn't get the presets to work properly and eventually found this bad 370 pF mica cap (#10 on the schematic).
It works with the adjustable coils to set the LO oscillator frequency.

[Image: http://farm8.staticflickr.com/7067/69342...bce9_z.jpg]

Each preset slug only covers a portion of the BC band as shown on the chassis.
[Image: http://farm8.staticflickr.com/7048/69342...8250_z.jpg]

Replacing it with a 390pF got the presets working, but I couldn't tune below 800 kHz on the first four presets. I bumped it up to 500 pF which go me down to 680 kHz.

I suppose I could increase the capacitance even more, but I'd like to know why the tuning range is so far off ?
[Image: http://farm8.staticflickr.com/7178/67880...e752_z.jpg]

(This post was last modified: 02-27-2012, 01:20 AM by Bob Andersen.)

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Messages In This Thread

Philco 39-30 restoration - by Bob Andersen - 02-05-2012, 12:39 AM

RE: Philco 39-30 restoration - by Bob Andersen - 02-27-2012, 01:20 AM

RE: Philco 39-30 restoration - by Bob Andersen - 02-27-2012, 01:20 AM

RE: Philco 39-30 restoration - by Bob Andersen - 02-27-2012, 11:22 PM

RE: Philco 39-30 restoration - by Ron Ramirez - 02-28-2012, 05:50 AM

RE: Philco 39-30 restoration - by Bob Andersen - 02-28-2012, 05:11 PM

RE: Philco 39-30 restoration - by Arran - 02-29-2012, 01:30 AM

RE: Philco 39-30 restoration - by Bob Andersen - 03-02-2012, 08:59 PM

RE: Philco 39-30 restoration - by Bob Andersen - 03-02-2012, 02:55 PM

RE: Philco 39-30 restoration - by Bob Andersen - 03-02-2012, 05:08 PM

RE: Philco 39-30 restoration - by Arran - 03-02-2012, 11:23 PM

RE: Philco 39-30 restoration - by Bob Andersen - 03-04-2012, 01:26 AM

RE: Philco 39-30 restoration - by Arran - 03-04-2012, 02:04 AM

RE: Philco 39-30 restoration - by Bob Andersen - 03-04-2012, 02:47 AM

RE: Philco 39-30 restoration - by Ron Ramirez - 03-04-2012, 07:28 AM

RE: Philco 39-30 restoration - by Bob Andersen - 03-04-2012, 03:11 PM

RE: Philco 39-30 restoration - by Bob Andersen - 03-04-2012, 09:13 PM

RE: Philco 39-30 restoration - by Bob Andersen - 03-05-2012, 10:47 PM

RE: Philco 39-30 restoration - by Arran - 03-05-2012, 11:53 PM

RE: Philco 39-30 restoration - by Bob Andersen - 03-06-2012, 12:40 AM

RE: Philco 39-30 restoration - by Arran - 03-06-2012, 02:45 AM

RE: Philco 39-30 restoration - by Bob Andersen - 03-06-2012, 04:30 AM

RE: Philco 39-30 restoration - by Arran - 03-06-2012, 08:09 PM

RE: Philco 39-30 restoration - by Bob Andersen - 03-06-2012, 11:42 PM

RE: Philco 39-30 restoration - by Bob Andersen - 03-13-2012, 07:17 PM

RE: Philco 39-30 restoration - by Arran - 03-13-2012, 10:08 PM

RE: Philco 39-30 restoration - by Bob Andersen - 03-16-2012, 10:45 PM

RE: Philco 39-30 restoration - by Bob Andersen - 03-30-2012, 09:05 PM

RE: Philco 39-30 restoration - by Ron Ramirez - 03-30-2012, 09:08 PM

RE: Philco 39-30 restoration - by Arran - 03-30-2012, 09:50 PM

RE: Philco 39-30 restoration - by Bob Andersen - 04-06-2012, 05:11 PM

RE: Philco 39-30 restoration - by Ron Ramirez - 04-06-2012, 08:22 PM

RE: Philco 39-30 restoration - by Bob Andersen - 04-06-2012, 11:44 PM

Re: Philco 39-30 restoration - by Arran - 02-05-2012, 01:21 AM

Re: Philco 39-30 restoration - by Bob Andersen - 02-05-2012, 02:09 AM

Re: Philco 39-30 restoration - by Arran - 02-05-2012, 02:20 AM

Re: Philco 39-30 restoration - by Ron Ramirez - 02-05-2012, 08:01 AM

Re: Philco 39-30 restoration - by Bob Andersen - 02-05-2012, 03:31 PM

Re: Philco 39-30 restoration - by Ron Ramirez - 02-05-2012, 05:09 PM

Re: Philco 39-30 restoration - by codefox1 - 02-05-2012, 05:12 PM

Re: Philco 39-30 restoration - by Bob Andersen - 02-05-2012, 05:36 PM

Re: Philco 39-30 restoration - by Arran - 02-05-2012, 09:40 PM

Re: Philco 39-30 restoration - by Bob Andersen - 02-07-2012, 11:18 PM

Re: Philco 39-30 restoration - by codefox1 - 02-08-2012, 10:06 AM

Re: Philco 39-30 restoration - by Bob Andersen - 02-08-2012, 05:15 PM

Re: Philco 39-30 restoration - by Ron Ramirez - 02-08-2012, 05:42 PM

Re: Philco 39-30 restoration - by Bob Andersen - 02-08-2012, 05:50 PM

Re: Philco 39-30 restoration - by Ron Ramirez - 02-08-2012, 08:11 PM

Re: Philco 39-30 restoration - by RGallahue - 02-08-2012, 08:27 PM

Re: Philco 39-30 restoration - by Bob Andersen - 02-08-2012, 10:18 PM

Re: Philco 39-30 restoration - by Bob Andersen - 02-10-2012, 12:03 AM

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