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Potentiometer ID
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Old 30th September 2013, 11:56 PM   #1
scrimpu is offline scrimpu  United States
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Default Potentiometer ID

I got a pair of these odd pots from a organ volume pedal, the schematic for the organ shows them as 250K, they are made by Allen Bradley. Anybody have any info on what this is?
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Old 1st October 2013, 08:36 PM   #2
phil is offline phil
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There is plenty of info on the web on how to tell if it's log or Lin. Adjust to halfway if it reads half the resistance it's probably Lin.
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Old 1st October 2013, 08:44 PM   #3
Frank Berry is offline Frank Berry  United States
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What is the fiber thing hanging off the back of the pot?
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Old 1st October 2013, 09:34 PM   #4
dchisholm is offline dchisholm  United States
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Quote:
Originally Posted by Frank Berry View Post
What is the fiber thing hanging off the back of the pot?
And do you have any clues about the function of the fourth solder lug on the main pot body?

Dale
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Old 1st October 2013, 11:18 PM   #5
phil is offline phil
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The pot may have a tap off, put your meter across it and it may tell you.
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Old 1st October 2013, 11:43 PM   #6
Enzo is offline Enzo  United States
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My first notion was that it might be a loudness tap.
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Old 2nd October 2013, 02:00 PM   #7
scrimpu is offline scrimpu  United States
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I am mostly wondering about the protrusion from the back of the pot that is connected to one of the 4 lugs with a wire.
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Old 3rd October 2013, 02:54 AM   #8
Sea Biscuit is offline Sea Biscuit  United States
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I'm thinking that the protrusion is probably a resistor. Find the input lug and read ohms between it and the wired lug, and then again between the input and the pot's wiper output [with the pot at half swing] and I bet they are two different values... just a thought
 

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