Philco 45C tone control caps? - 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: Philco 45C tone control caps? (/showthread.php?tid=19846)
+- 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: Philco 45C tone control caps? (/showthread.php?tid=19846)
Philco 45C tone control caps? - sdradioman - 04-07-2019
Im sure this has been asked many times before but what are the values of the caps in the tone control pot of a Philco 45C? I just did a 16B and they where three .003mfd... I have read they where .01, .02, and .001, others have said .01, .02, .003. Any ideas? Thanks!!!
RE: Philco 45C tone control caps? - Ron Ramirez - 04-07-2019
Left to right: .01 uF, .02 uF, .003 uF
RE: Philco 45C tone control caps? - Radioroslyn - 04-07-2019
The caps in the 45 are used to lessen the high frequency response to the amp. Values are not particularly critical just the larger the capacitance the less high frequency response. I generally error towards the smaller values. Make the sound brighter rather that muffled. The 45 also has what is called loudness control (it done via the tap on the volume control) which lessens the bass response has the volume is increased.
RE: Philco 45C tone control caps? - Ron Ramirez - 04-07-2019
The Philco part number for the tone control is 30-4178, the same as used in Model 29.
The Model 29 schematic gives the values of the three individual caps; the 45 schematic does not.
Model 29:
https://philcoradio.com/library/download/service%20info/wiring%20diagrams/vol1/split/Part17-Philco%20Wiring%20Diagrams%20Vol.%201.pdf
Model 45:
https://philcoradio.com/library/download/service%20info/wiring%20diagrams/vol1/split/Part29-Philco%20Wiring%20Diagrams%20Vol.%201.pdf
RE: Philco 45C tone control caps? - Radioroslyn - 04-07-2019
#41 decouples the audio signal from getting into the high voltage. It has nothing to do w/the tone control circuit however #42 (switch and 43 caps) are the tone control.
RE: Philco 45C tone control caps? - morzh - 04-08-2019
None of the tabletop Philcos' tone controls work terribly great. Especially if done using correct values.
RE: Philco 45C tone control caps? - Ron Ramirez - 04-08-2019
(41) is not the tone control. Please re-read Terry's post (#6, above).
The tone control is at the far upper right of the schematic, parts (42) and (43).