Supreme 450 set tester schematic - Printable Version
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Supreme 450 set tester schematic - daveone23 - 08-20-2024
Iam trying to figure out why these pin sockets are shown as diodes on the schematic. They have continuity.
RE: Supreme 450 set tester schematic - DaleHCook - 08-21-2024
Did you check them with a low-voltage variable supply to see if they have diode knees?
RE: Supreme 450 set tester schematic - daveone23 - 08-21-2024
No, I just used a DMM and checked continuity.
RE: Supreme 450 set tester schematic - morzh - 08-21-2024
I am not sure diodes were manufactured and used at the time that tester was being built.
RE: Supreme 450 set tester schematic - DaleHCook - 08-21-2024
Copper-oxide diodes existed at that time. I own a Triplett 1167-A set tester ca. 1935 which uses a small copper-oxide stack as the voltmeter rectifier for measuring AC. I doubt that is what is shown on the schematic, though.
RE: Supreme 450 set tester schematic - daveone23 - 08-21-2024
What does this look like. Its soft like a wire and has continuity. Both sides go to the ohms jack.
RE: Supreme 450 set tester schematic - Chas - 08-22-2024
Current shunt, covered with an asbestos braid tube. Probably a custom value...