14B Code 122 Mystery Tone Capacitor - 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: 14B Code 122 Mystery Tone Capacitor (/showthread.php?tid=26182)

---

14B Code 122 Mystery Tone Capacitor - Sipolandis - 01-06-2026

Received a 14B Code 122 that someone else had gone through. Double-checking all the capacitors lead me to the tone circuit. The schematic I have indicates that one of the capacitors in the tone circuit is a whopping 3,000 uF. The associated parts list shows "....." for the value of that capacitor. Any clue to what it really should be?

---

RE: 14B Code 122 Mystery Tone Capacitor - morzh - 01-06-2026

It's a typo.

3nF

The part 30-4073 contains a 0.05uF and 3nF caps.

They switched "m" for "mU".

And, well, at the time they did not have such capacitances.

---

RE: 14B Code 122 Mystery Tone Capacitor - Sipolandis - 01-06-2026

Thank you so much. That makes a lot more sense.

---

RE: 14B Code 122 Mystery Tone Capacitor - morzh - 01-06-2026

Oh...and for the "..." for the value.
The parts list says this:
64: condensers internal to 63.
63: Tone control 30-4073.

This could be found in the late Ray Bintliff's book "Philco Condensers and More".
Unfortunately they are rare, I bought one of the last off of Ray shortly before he left us.


   

---

RE: 14B Code 122 Mystery Tone Capacitor - Sipolandis - 01-06-2026

Thanks again. I'll add the info to my personal archive.

---