[Hallicrafters] Re: Hallicrafters Digest, Vol 24, Issue 15

[Rich Arland]

Mike:

Try something that Mark Francis, KI0PF, showed me when I had a similar
problem aligning my TRC-77A.

Go to your junque box of nuts and bolts. Find your tremendously large
collection of nuts (the ones that screw onto the ends of bolts, NOT the type
of nuts that play with radios!!) and find one that will thread onto the
piston cap tuning shaft. Start the nut on the shaft and run it down to where
the tip of teh broken slot just protrudes over the top of the nut. THEN,
with a very hot soldering gun (or iron) put a dollup of solder on the
nut/adjustment shaft and let it cool.

THEN take a nut driver the same size as the nut and proceed to tune the
piston cap.

OBTW; it has been my experience that replacing a quality item like a piston
cap with an air variable or trimmer cap is not the best idea. The ability to
finely adjust the capacitance via the piston cap can be critical especially
doing something like PA neutralization.

GL and let me know if this simple fix works well for you. It certainly did
for me.

vy 73

Rich K7SZ
> I am in need of a replacement neutralizing capacitor for my HT-44 project
I am working on. It is located on a bracket between the tubes in the final
cage. C77, .8-13 pf piston type (an equivalent miniature air variable will
work). ½ of the screw driver slot has broken off the adjustment shaft on
mine (2 part guarantee) and is only adjustable with a pair of needle-nose
pliers (tricky around high voltage!).