Fedtro Vacuum Tube Tester to USB Conversion

Well, I basically took the tester and removed the battery spacers out that were obsolete

Due to the size of the battery which was slightly smaller by a 5th of it. I then took an old Phone usb and usb adapter charger and clipped the micro usb connection off exposing the internal wires I then soldered the negative to negative and positive to positive and ran several test to confirm if is usefulness it worked like a charm.

tested the tester by plugging it into the outlet and computers even my car and it worked :)

so here you go enjoy

a Fedtro Vacuum tube tester circa 1966

To USB Conversion.