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!!!
Left to right: .01 uF, .02 uF, .003 uF
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.
#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.
None of the tabletop Philcos' tone controls work terribly great. Especially if done using correct values.
(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).