Hello Peter, I would very much like to get my hands on any information on the unit if You can help me ut
If this had been an ususal stright forward amplifier , what would all the other components on the board do?
The 100mA fuse on the board could be a supply-fuse; Nope, it is in the signal path protecting the input. From there the signal goes to the "sandwich". Before desoldering the unit, it consists as far as I can see 2 diodes, so the idea of feedback still makes a bit of sense. If the "variable attenuator" circuitry serves any purpose i my envionment is another story.