u-test-m tube tester

[ohohyodafarted]

I know this is a long shot, but does anyone have any idea where to get a schematic for a U-test-M tube tester.

It is a very simple unit underneath. I already replaced the rectifier diodes and the electrolytics. Still dosent work. When you hit the test lever, the needle goes negative. The thing seems simple enough. Looks like all the various voltages from the multi tap transformer are wired directly to the appropriate sockets, and it appears that when you hit the test switch it completes the common side of the transformer and power supply circuit.

Sometimes simple gets very complicated without a schematic. If I had a schematic I could probably get it running in nothing flat.

If anybody can help, with any information on who built these testers, or where to get a schematic I would be most greatful for the help.

Thanks!