I have a 15-year old Model 125B, but no handbook nor service data.
It has 5 spot freqs and Auto/Manual Sweep and a variable o/p Level with
on-off switch.
It runs off 2 x 9v batteries, works OK, but has one glitch:
its o/p is too high at 20Hz compared with its other freq spectrum.
Can u please help?
Ta Jim