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48-472 No FM
Eric Adams
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#1

02-10-2017, 01:39 PM
Hi guys,
I've got one that I've been working on for a while. All caps replaced, tubes tested. AM works great-nothing on FM.
Any ideas?

.pdf philco_48_472_sch.pdf Size: 178.87 KB  Downloads: 149


Thanks,
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org

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Mondial
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City: Irvington, NY
#2

02-10-2017, 02:32 PM
If you input a 9.1 MHz FM signal from your 8601A into the first IF stage, do you hear anything?
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Eric Adams
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#3

02-11-2017, 12:00 PM
Would that be applying the signal at the antenna or where it states in the instructions? 
Thanks,
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org

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Mondial
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#4

02-11-2017, 12:11 PM
Where ever the alignment procedure says to input the 9.1 MHz IF signal for alignment should be fine. What you want to find out is if the IF or FM detector is the problem, or its the FM local oscillator that's causing no reception.
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Eric Adams
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Posts: 825
Threads: 113
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City: The Villages State, Province, Country: Florida
#5

02-11-2017, 02:11 PM
Great. Thanks. I'll check it later today and let you know.
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org

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  1. The PHILCO Phorum
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  3. Philco Electronic Restoration