The PHILCO Phorum
42-350 tuning condenser. Never worked on this. - Printable Version

+- The PHILCO Phorum (https://philcoradio.com/phorum)
+-- Forum: Philco Radio Discussions (https://philcoradio.com/phorum/forumdisplay.php?fid=5)
+--- Forum: Philco Electronic Restoration (https://philcoradio.com/phorum/forumdisplay.php?fid=8)
+--- Thread: 42-350 tuning condenser. Never worked on this. (/showthread.php?tid=19167)


42-350 tuning condenser. Never worked on this. - Patrick - 10-30-2018

This tuning condenser has 4 gangs. But 2 are single blade (I would imagine SW and FM?). I didn't mark them when I removed them, and I'm lost as to proper hook-up.

I know the tuner is #14. One tab is connected to pin 2 of #7 (the FM oscill. trans.), one is connected to pin 7 of #7, one to C-3/C-4, and one to B-4.

But for the life of me, I can't figure out which! Can someone help?

Thanks,

Pat  

[Image: http://i1367.photobucket.com/albums/r796/paydirt2/tuner_zpsq9ozv5t3.jpg]

[Image: http://i1367.photobucket.com/albums/r796/paydirt2/42-350_p004_zpsmtnzyvg3.jpg]

RE: 42-350 tuning condenser. Never worked on this. - Radioroslyn - 10-30-2018

>(I would imagine SW and FM?)
For the FM section.

RE: 42-350 tuning condenser. Never worked on this. - amptramp - 10-30-2018

According to the schematic, the FM coils are directly across the single-section parts of the tuning capacitor and AM and SW share the other part.  The bandswitch positions appear to be pushbutton AM tuning (where the switch is in the schematic), AM, SW and FM.  Pushbutton tuning only uses the rows of tuning capacitors on the bottom.  AM and SW use the large parts of the tuning cap and FM uses the small part.

RE: 42-350 tuning condenser. Never worked on this. - Patrick - 11-01-2018

Now I see it. Thanks.

RE: 42-350 tuning condenser. Never worked on this. - Patrick - 11-01-2018

(10-30-2018, 06:53 PM)Radioroslyn Wrote:  >(I would imagine SW and FM?)
For the FM section.

I see it now. Would have been nice if Philco would have indicated that rather than just expecting everyone to know it.

RE: 42-350 tuning condenser. Never worked on this. - Radioroslyn - 11-01-2018

It's pretty much common sense the smaller amount of capacitance the higher the frequency.

RE: 42-350 tuning condenser. Never worked on this. - Patrick - 11-02-2018

(11-01-2018, 07:14 AM)Radioroslyn Wrote:  It's pretty much common sense the smaller amount of capacitance the higher the frequency.

It's common sense IF you can remember everything you've learned about electronics. I've forgotton more than I ever knew.

RE: 42-350 tuning condenser. Never worked on this. - Radioroslyn - 11-02-2018

[Image: http://philcoradio.com/phorum/images/smilies/icon_lol.gif]

RE: 42-350 tuning condenser. Never worked on this. - morzh - 11-02-2018

Philco, in its time, never expected anyone other than trained technicians to tend to their radios. This is why they never put down any details like this one.