Posts: 112
Threads: 36
Joined: May 2015
City: Brandon, SD
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!!!
Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand
State, Province, Country: Indiana
Left to right: .01 uF, .02 uF, .003 uF
--
Ron Ramirez
Ferdinand IN
Posts: 7,248
Threads: 266
Joined: Dec 2009
City: Roslyn Pa
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.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
(This post was last modified: 04-07-2019, 08:08 PM by
Radioroslyn.)
Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand
State, Province, Country: Indiana
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...l.%201.pdf
Model 45:
https://philcoradio.com/library/download...l.%201.pdf
--
Ron Ramirez
Ferdinand IN
Posts: 7,248
Threads: 266
Joined: Dec 2009
City: Roslyn Pa
#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.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
None of the tabletop Philcos' tone controls work terribly great. Especially if done using correct values.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand
State, Province, Country: Indiana
(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).
--
Ron Ramirez
Ferdinand IN