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Philco 38-690 restoration
FStephenMasek
Member
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Posts: 234
Threads: 43
Joined: Mar 2008
City: Mission Viejo, CA
#25

07-06-2014, 01:40 PM
It turned out that there was an open 1,000 ohm resistor in the circuit feeding B+ to the RF and mixer tubes, number 64 on the schematic:

[Image: http://i269.photobucket.com/albums/jj77/.../037-2.jpg]

I've got one of the three chassis sections done, and it plays much better now, receiving many stations. I suspect the tweeters are not working, but I'll get to that issue after finishing the radio chassis work. The problem may even be in the radio chassis.

The guy who previously worked on it did not bother to replace 0.02 mfd capacitors with the proper value, instead using 0.01mfd units, even though he could have put two of those in parallel ...

I'm going though and replacing the resistors and correcting capacitor errors.
Web site: http://www.masekconsulting.net
Radio Photos: http://www.photobucket.com - album id FStephenMasek
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Messages In This Thread
Philco 38-690 restoration - by FStephenMasek - 04-18-2011, 09:30 PM
RE: Philco 38-690 restoration - by FStephenMasek - 04-13-2013, 12:47 PM
RE: Philco 38-690 restoration - by FStephenMasek - 04-13-2013, 09:16 PM
RE: Philco 38-690 restoration - by morzh - 04-13-2013, 09:22 PM
RE: Philco 38-690 restoration - by FStephenMasek - 02-17-2014, 12:35 PM
RE: Philco 38-690 restoration - by morzh - 02-17-2014, 12:43 PM
RE: Philco 38-690 restoration - by FStephenMasek - 02-17-2014, 10:13 PM
RE: Philco 38-690 restoration - by morzh - 02-17-2014, 10:16 PM
RE: Philco 38-690 restoration - by FStephenMasek - 06-22-2014, 12:04 AM
RE: Philco 38-690 restoration - by morzh - 06-22-2014, 10:56 AM
RE: Philco 38-690 restoration - by FStephenMasek - 06-22-2014, 01:01 PM
RE: Philco 38-690 restoration - by FStephenMasek - 06-22-2014, 07:18 PM
RE: Philco 38-690 restoration - by morzh - 06-22-2014, 08:44 PM
RE: Philco 38-690 restoration - by gregb - 06-22-2014, 08:47 PM
RE: Philco 38-690 restoration - by PhilcoJohn - 06-23-2014, 05:47 PM
RE: Philco 38-690 restoration - by morzh - 06-23-2014, 05:53 PM
RE: Philco 38-690 restoration - by FStephenMasek - 07-06-2014, 01:40 PM
RE: Philco 38-690 restoration - by morzh - 07-06-2014, 02:13 PM
RE: Philco 38-690 restoration - by FStephenMasek - 07-06-2014, 02:46 PM
RE: Philco 38-690 restoration - by morzh - 07-06-2014, 02:51 PM
RE: Philco 38-690 restoration - by FStephenMasek - 07-10-2014, 04:32 PM
RE: Philco 38-690 restoration - by morzh - 07-10-2014, 05:32 PM
RE: Philco 38-690 restoration - by FStephenMasek - 11-06-2014, 01:27 AM
RE: Philco 38-690 restoration - by sam - 11-06-2014, 03:57 AM
RE: Philco 38-690 restoration - by 462ron - 11-06-2014, 01:13 PM
RE: Philco 38-690 restoration - by klondike98 - 11-06-2014, 02:08 PM
RE: Philco 38-690 restoration - by morzh - 11-06-2014, 02:35 PM
RE: Philco 38-690 restoration - by FStephenMasek - 11-11-2014, 12:57 PM
RE: Philco 38-690 restoration - by morzh - 11-11-2014, 01:17 PM
Re: Philco 38-690 restoration - by Ron Ramirez - 04-19-2011, 10:07 AM
Re: Philco 38-690 restoration - by FStephenMasek - 04-19-2011, 12:59 PM
Re: Philco 38-690 restoration - by Ron Ramirez - 04-19-2011, 02:00 PM
Re: Philco 38-690 restoration - by FStephenMasek - 04-19-2011, 02:35 PM
Re: Philco 38-690 restoration - by Ron Ramirez - 04-19-2011, 02:47 PM
Re: Philco 38-690 restoration - by FStephenMasek - 04-20-2011, 10:47 PM
Re: Philco 38-690 restoration - by Ron Ramirez - 04-21-2011, 07:41 AM
Re: Philco 38-690 restoration - by FStephenMasek - 04-26-2011, 10:06 PM



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  1. The PHILCO Phorum
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  3. Philco Electronic Restoration