Re: Mystery wooden box? Help identifying please
They are all Hivac. The XD2.0 is a 2V heater triode (4 pin), and XY2.0 is a 2V heater pentode (5 pin), XSG is a 2V heater pentode (4 pin).
They are all listed in the AVO VCM163 manual. But that also has set up data for the other AVO valve testers too.
Craig
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