This is a quick post for now. I have a tube tester, it's a UnaOhm GB24A. It is VERY complete, but in an awful state, so I am thinking of restoring it, although it is not an easy task.
The first thing to do with a tube tester is always to get the manual, the tables and the circuit, and in this case it was really hard to find.
After the wonderful help of Franco Gastaldi, Paolo Califano & Albert Dauby, (I really thank the three of you guys for all the help which you independently provided) I was provided several versions of the manual.
If you need it, here you have:
- UnaOhm GB24A Tube Tester.pdf (4.8MB)
- UnaOhm GB25A Tube Tester.pdf (7.4MB) (This one has information on GB26 &GB37 as well)
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