Electronics > Beginners
Identifing a Potentiometer
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PA0PBZ:

--- Quote from: drussell on August 25, 2018, 05:18:25 pm ---He stated that the carbon track is damaged, so he cannot measure it:

--- End quote ---

Ah ok,  I was still with the first post " The wiper fell off"
drussell:

--- Quote from: PA0PBZ on August 25, 2018, 05:48:43 pm ---Ah ok,  I was still with the first post " The wiper fell off"
--- End quote ---

Yeah, I was a bit puzzled by that at first also...  :)

I'm assuming that even though the area still looks dark in his photo, the actual conductive layer is gone by his later descriptions.

As others have stated, it seems that the 1377913 is 10K linear, the other numbers denoting the style of shaft, mounting, etc.  I expect that virtually any 1/8 watt or greater 10K linear pot that will physically fit will work sufficiently well in this application.  There should be no need to repair this one with a new wafer part from another pot or replace with an identical part.
Jwillis:
Since it came from a Capacitor Analyzer ,chances are very good that its a Linear pot .Logarithmic pots are generally used for volume control because of the response of the human ear to volume.  Take a measure from center to 1 quarter of just the carbon track and multiply by 4  that will give you a ball park measurement . Judging from the number and description it's a 16mm 1/8 shaft 15K linear. 15K seems odd ,but try the measurement to see what you get. 
drussell:

--- Quote from: Jwillis on August 25, 2018, 07:51:48 pm ---Take a measure from center to 1 quarter of just the carbon track and multiply by 4  that will give you a ball park measurement . Judging from the number and description it's a 16mm 1/8 shaft 15K linear. 15K seems odd ,but try the measurement to see what you get.
--- End quote ---

Once again, the OP stated that the carbon track is damaged (the carbon layer is gone), so he cannot measure it:


--- Quote from: SuperDaveOsbourne on August 25, 2018, 04:28:35 pm ---You can see in the picture that the resistive carbon had all come off. The flakes on the paper towel of what was left and there was no continuity anywhere across the graphite ring.
--- End quote ---
floobydust:
Mikes Radio Repair has the Sencore CA55 service manual, seen in the youtube vid. Ask him. Or contact Sencor, they do sell service manuals.

It's front-panel R9 100k on the schematic and has a R1061 500k Zero Center trimpot in series.

But not listed on the parts list, that I can see; just these:
R20 15C7-26 Control, 1M Vert. PC Mount
R22,R101 15C7-17 Control, 1k Vert. PC Mount
R24 15C7-9 Control, 100R Vert. PC Mount
R61 15C7-6 Control, 500k Vert. PC Mount
R71,R74 15C7-13 Control, 100k Vert. PC Mount

https://www.patreon.com/MikesRadioRepair

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