07-31-2015, 10:09 AM
I am just finishing up a restore of a Philco 84 cathedral. I had to rewind the primaries on the antenna and oscillator coils. I replaced all the capacitors. I also replaced all the dogbone resistors. I have adjusted the regeneration control, and peaked the IF capacitors. It is playing with pretty good volume with only an 8 ft. piece of antenna wire.
I need to still make the 2 meg ohm resistor change from the service tip in the IF transformer to see if it plays even better.
Question...I noticed that someone had removed the "gimmick" capacitor (#3) so I replaced it. It seemed to make no difference. What exactly is the capacitor doing? Coupling a little extra signal from the antenna to the oscillator?
Why would it seem to not be needed?
Thanks,
Mark K8KZ
I need to still make the 2 meg ohm resistor change from the service tip in the IF transformer to see if it plays even better.
Question...I noticed that someone had removed the "gimmick" capacitor (#3) so I replaced it. It seemed to make no difference. What exactly is the capacitor doing? Coupling a little extra signal from the antenna to the oscillator?
Why would it seem to not be needed?
Thanks,
Mark K8KZ