The SB-102 uses 4 1N191 Germanium diodes in a ring type balanced
modulator. Do these diodes need to be matched?
The symptoms: I am seeing 2 problems that may be related. One is that
the carrier null trimmer capacitor has no effect; the carrier null pot
does null the carrier when turned way to one side. The other symptom is
that LSB is about 45 watts out while USB is about 100. There are only a
handful of parts in the balanced modulator. Replacing all of them, with
the exception of the trimmer, may be the way to go. Any suggestions?