04-12-2013, 02:16 PM
OK, here's my latest project. I replaced all electrolytics and wax/paper caps. Checked and replaced all resistors. Checked all coils. All tube test good.
AM sounds great. FM just hums. While turning the dial, I was able to disrupt reception on an FM radio on my bench. So I guess the oscillator is working. I checked the AM/FM switch (had a problem with one on a Philco once) and it appears to be OK. Any ideas where to look?
Here's the schematic: http://www.nostalgiaair.org/Resources/312/M0025312.htm
Thanks,
Eric
AM sounds great. FM just hums. While turning the dial, I was able to disrupt reception on an FM radio on my bench. So I guess the oscillator is working. I checked the AM/FM switch (had a problem with one on a Philco once) and it appears to be OK. Any ideas where to look?
Here's the schematic: http://www.nostalgiaair.org/Resources/312/M0025312.htm
Thanks,
Eric
