[Hallicrafters] SX-42 Circuit variations (?)

[Edward B Richards]

Hi Dennis;

I recently did a major repair on a SX-42. Took 2 wafers out of the
bandswitch to repair them, plus some other stuff. Worked great when I
finished. I had 3 different schematics and the radio did not match any of
them. Replace the .05 (?) screen bypass for the 2 6AG5's with mica or
ceramic, with very short leads (1/8"). The bandswitch is notorious for
shorting between rivets on both sides of wafer G, I think. It is the one
with the plate circuit from the first RF amp on one side and the grid
circuit of the second RF amp on the other side. If you have to work on
the bandswitch I can give you my experience and I have some 5-40 threaded
rod and nuts. Good luck.

73, Ed Richards K6UUZ
Simi Valley, Ca 93065
Home of the Air Force 1 pavilion
 
On Fri, 20 Jan 2006 14:14:21 EST W7QHO at aol.com writes:
> I'm currently in the process of restoring an SX-42.   Problem is, I'm 
> finding 
> significant deviations in the component values and circuit details 
> from those 
> shown in the Hallicrafters Service Bulletin (Nov. 1947, 94X242).   I 
> also 
> have a Sams Photofact Folder dated 8/48 that agrees with the 
> Hallicrafters 
> documentation.   The wiring in the set appears to be unmodified, 
> factory original 
> and is in excellent condition.   
> 
> Would appear I have an earlier/later model than that described in 
> the data I 
> have.   Anyone know more?
> 
> Dennis D. W7QHO
> Glendale, CA
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