Stuck on GE model 220-FOUND IT-tnx-Jon
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
My newest project. Am works great. SW has no sound. No static or anything.I did a full recap, checked resistors, tubes are good and the coils checked ok. The weird thing is that I was able to do an alignment on both AM and SW. I was able to follow the instructions for SW alignment. Got a tone loud and clear when and where I was supposed to, but that's all I get.
Any ideas?
Thanks.
GE 220 Schematic
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
(This post was last modified: 04-18-2014, 12:41 PM by Eric Adams.)
Posts: 395
Threads: 33
Joined: Jul 2013
City: Horsham, PA
Eric,
There is a very recent thread on another forum where someone was able to hear signal generator tone, but no stations. Virtually identical problem. I haven't checked on that thread in a few days, but I believe they had it narrowed down to one of the trimmer caps on the 1st IF transformer. Might be worth a read.
Good luck.
Jon
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
Jon,
I read the thread. Nick's problem was no reception on any band. Mine works fine on AM. My problem is with SW only.
Thanks,
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
Posts: 395
Threads: 33
Joined: Jul 2013
City: Horsham, PA
I know you said that the tubes test good, but have you tried a different converter (12SA7) tube?. The RF tube isn't in the circuit on SW, so it can't be that. I wonder if the converter is marginal in-circuit, even though it tests OK.
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
Jon,
You're the best!! That was it!  That's unreal that it was that simple!
Thank you 
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
Posts: 395
Threads: 33
Joined: Jul 2013
City: Horsham, PA
You are very welcome. I've read a lot of posts and converter tubes seem to be a little finicky sometimes. Moreso than other tubes, at least that is my impression.
Make it a good day.
Jon
Posts: 16,495
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Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
I had a proble with 6a7 pntagrid where the Brodcast worked and 1/2 of shortwv did, but below 7MHz it would stop oscillating.
They are finicky.
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