48-1262 no sound - 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: 48-1262 no sound (/showthread.php?tid=6490)

---

48-1262 no sound - ke5yum - 04-19-2013

In a previous post, I complained of low voltage. I replaced the 50 x 6, and the voltages came up just fine, though a little high. I also replaced one resistor that was open. All I hear now from the speaker is a dull hum.

I performed the oscillator test with guidance from the manual, and the voltage readings are .02 instead of the required -3.3 to 4.2 (if I did it correctly); ohms at the coil read 3.0. Voltages on the 14AF7 are good at the test points.

The trouble shooting guide Section 4 says for the osciallator test says to "connect the negative lead of the voltmeter through a 100K ohm resistor to osciallator grid, test point D."

My question is where does the 100K ohm resistor attach? As I read the instructions, it looks like I attach it to an alligator clip lead in line. Is that correct?

If this checks out ok, I will move to the audio transformer, but as Scarlett O'hara said, "tomorrow is another day."

Thanks for all your help in advance.

Terry

---

RE: 48-1262 no sound - Jim Dutridge - 04-19-2013

Positive lead of the meter to the negative side of the filter capacitors. The 100K resistor connects between your negative lead and pin 4 of the 14AF7.

---

RE: 48-1262 no sound - ke5yum - 04-19-2013

Thanks Jim. I think I did this correctly last night, but I will check again on Monday. If my voltages are low, is there another check I can do to see why they are low and what parts may be bad?

---