Dave Platt wrote:
In article ,
David Brodbeck wrote:

Good thought! No such luck, though. Looking at the schematic, if there
were such a jumper it also would null at 200 ohms when the "range
expander" switch is on, and it doesn't.

I think when I get time I'm going to check the transformer windings for
continuity...maybe someone transmitted into it and blew a winding. It
looks from the schematic like this little toroidal transformer would be
"first in line" to get zapped.

Yup. Not an uncommon way for these devices to go to Tumbolia. The
pot might also have gotten cooked.

Well, I'm stumped. The pot tests fine. The windings on the toroidal
transformer have continuity, and none are shorted to each other. It
seems like it ought to work, but I continue to not get a useful null for
resistance -- it just gets quieter the closer to zero I turn the knob.
The inductance/reactance knob works, though -- I can get sharp nulls
with it.