[ohohyodafarted]

Thanks, I dropped him a note requestiing help if possible.

I don't think the diodes are in backwards. It had the original ones in the unit and the polarity was plainly marked. Very wierd looking in a 1/2" bakelite cube with 2 terminals out the top and a mounting stud on the bottom, and they did not register when I tested them on my meter. So I went ahead and replaced the 2 diodes and the electrolytics. I got the same results with the new parts installed.

I also cleaned up the multi section rotary selector switch with de-ox-it.

Tube testers are a pain to work on. Very hard to follow the wiring. Last time I fixed a Hickok tube tester I tore my hair out for days and I had a schematic. Eventually I found a cold solder joint, probably was that way right from the factory.

Thanks for your help.