[Heathkit] HW100 CXR NULL POT

[David Goncalves]

It wouldn't be the same form or dimensions. I used a small blue-block shaped
trimpot (10 turn, adjustment screw on top) and bent the leads so they would
fit through the same PCB holes. After soldering I dabbed some coil dope to
hold the new part in place. Good carrier nulling then became a breeze.

In general, pick one with the adjustment screw on top, non-wirewound,
with >6 mm leads. The blue Bourns ones worked well for me.

Good luck!

David Goncalves

On Mon, Feb 22, 2010 at 10:05 AM, Dick KF4NS <kf4nsradio at verizon.net> wrote:

> I recall someone mentioning a while back that a replacement would be a
> 10 turn 200 ohm pot from Mouser or Newark. After a thorough search of
> both catalogs, I cannot find such a pot with the same dimensions as
> the original. Nothing had the terminals pointing up in parallel with
> the adjusting shaft.
>
> Should I be looking for one with entirely different dimensions and
> jury rig it to fit?
>
> When I get done with the repair I believe I will have cured a
> miserable problem that seemed to have no solution, which really is
> killing my ego as a troubleshooter extraordinaire. Will not say yet,
> but if this fixes things I will tell the tale.
>
> 73, Dick KF4NS