[Hallicrafters] S-77 "Resonant" Cap Question

[Wj5mh at aol.com]

In a message dated 1/25/06 7:36:38 P.M. Central Standard Time,  Wj5mh at aol.com 
writes:

Looking at the schematic, C-59 in this AC/DC S-77 is between chassis  ground  
and neutral (if you use a polarized plug).  However, the  cap is actually in  
series with a coil that is wound around the high  side of  the capacitor.  
The 
parts list calls this a "resonant"  capacitor, and it's in parallel with a 
270 K 
resistor.  Has anyone  tried to duplicate this "resonant" cap?
 
>
I measure the coil, and it's around 2.5 uh.  I wound another on a  small 
form, and stuck it in series with a replacement .047 uf cap.  Works  fine.
 
On another note:  The BFO injection seems low.  The signal is fed  to the 
detector through a gimmick capacitor.  I noticed on different  versions of the 
S-40, the signal is fed to the grid of the second IF amp through  a gimmick cap. 
 I may try that after replacing the BFO tube sometime down  the road.
 
Joe