Posts: 450
Threads: 84
Joined: Nov 2011
City: Cumming, GA
![03-31-2020, 02:17 PM](attachment.php?aid=21897)
Afternoon
I posted earlier about replacing the speaker in this radio and I got it sorted out, I put in a choke and a ceramic resistor to make up the rest of the resistance and finished the recap. Powered up and it really plays so good I've put off doing an alignment. My problem is with the push buttons. We have two really strong AM stations here 750kc and 680kc where I live.
I can preset the 750kc on #1-4 buttons but get nothing trying to pick up 680. I have read while doing a search that Dual Capacitor 21 & 21A each is 370pf should be replaced as it can drift. Is this the problem? On the regular dial I have no issue picking up 680kc and lower. Sorry the print leaves a lot to be desired.
Buttons are 1-3 540-1060kc
4-5 650-1110kc
Schematic here
http://www.nostalgiaair.org/pagesbymodel...013408.pdf
Thanks
Eric
Posts: 7,248
Threads: 266
Joined: Dec 2009
City: Roslyn Pa
I've had a couple '41 sets that that capacitive divider has drifted and the p/b oscillator coils won't tune down to the end of the bcb.
I'd replace both 370mmfd caps 21 and 21A.
https://philcoradio.com/library/download...20Book.pdf
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
Posts: 450
Threads: 84
Joined: Nov 2011
City: Cumming, GA
Thanks Terry
I have some 360pf silver mica caps I will put in tomorrow.
Eric
Posts: 450
Threads: 84
Joined: Nov 2011
City: Cumming, GA
Terry
Changed it out this morning and 680 and a more faint station were tuned in. It was easier to change out than it looked. Thanks for the input.
Eric