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Supreme 450 set tester schematic
daveone23
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#1

08-20-2024, 06:42 PM
Iam trying to figure out why these pin sockets are shown as diodes on the schematic. They have continuity.


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DaleHCook
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#2

08-21-2024, 09:02 AM
Did you check them with a low-voltage variable supply to see if they have diode knees?
Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
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daveone23
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#3

08-21-2024, 10:11 AM
No, I just used a DMM and checked continuity.
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morzh
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#4

08-21-2024, 10:23 AM
I am not sure diodes were manufactured and used at the time that tester was being built.
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DaleHCook
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#5

08-21-2024, 02:55 PM
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.
Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/
(This post was last modified: 08-21-2024, 02:58 PM by DaleHCook.)
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daveone23
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#6

08-21-2024, 07:27 PM
What does this look like. Its soft like a wire and has continuity. Both sides go to the ohms jack.


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Chas
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#7

08-22-2024, 11:24 AM
Current shunt, covered with an asbestos braid tube. Probably a custom value...
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