[Milsurplus] BC-375 neutralizing cap?

Mike Hanz AAF-Radio-1 at aafradio.org
Fri Aug 31 07:59:45 EDT 2007


It's not a neutralizing capacitor, Ian.  The assembly is capacitors 1103 
and 1104 on the circuit diagram.  Sez "Capacitor 1104 is the calibration 
reset, by which the master-oscillator frequency can be adjusted to 
correspond to the calibration whenever the oscillator tube is changed.  
Capacitor 1103 provides thermal compensation for frequency drift 
normally caused by warmup and variation of ambient temperature of the 
oscillator tube."

73,
Mike  KC4TOS

Ian Wilson wrote:

>Recently picked up a 4-pin socket (VT-4C type). Included was a
>neutralizing capacitor. This one appears to have 3 connections, which
>puzzles me.
>The central plate is fixed, while the two outer ones are adjustable
>relative to the
>centre (each plate is a bulbous circular disk).
>
>(Since writing this I took a look at the BC-375 schematic, and don't see any
>neutralizing caps. But it's a triode rig .. did I miss something?).
>
>Looking for enlightenment.
>



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