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| Same-size replacement for older potentiometer? |
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| elroy:
Recently I bought a used HP 3586B selective level meter. Overall it's in great shape. The only minor nit is that the volume control for the audio out didn't quite survive the shipment, and the small potentiometer's shaft sheared off clean with the threading on the front of the pot's body. I'm not seeing any way to adapt a knob to control it as-is, so it seems as though the best option is to replace the pot. The pot has the following on its side: 2100-0669 CLARO 50K [ohm symbol] 19-8431 USA I did a web search and couldn't find any relevant hits from the above. Obviously there's no problem with finding a 50K pot (audio taper, I imagine), but the challenge will be to find one (via online shopping) that will fit the fairly tight space occupied by the old one. So, two questions. First, is there any way using the above information to find an essentially identical pot? If not, what is the quickest/easiest way to find a compatible-size replacement? I guess I can measure the dimensions of the old pot (diameter etc) and dig through the spec sheets for pots in online searches. Is there a faster way to do that? |
| james_s:
Measure it, then hit the parametric search on DigiKey, Mouser, etc. posting a picture here may help you get some suggestions. |
| Nusa:
Well, given no information from the numbers provided (I'll take your word on that), the measurement route should get you there. If you want to reuse the original knob we need shaft size, shaft length, and shaft end type. Otherwise, whatever matches the knob you do want to use. Mounting hole size. Width and depth of area available for pot. Or at least measurements of the old pot. Picture of parts against a ruler would probably go a long way. |
| elroy:
--- Quote from: james_s on August 01, 2019, 10:59:08 pm ---Measure it, then hit the parametric search on DigiKey, Mouser, etc. posting a picture here may help you get some suggestions. --- End quote --- Thanks. See the picture below. My imperial micrometer indicates the body is 0.5" diameter, the height is 0.475" from the back to where the threading starts, or ~0.71" from the back to the top of the threading. The shaft (retrieved from the loose knob) is 0.125" diameter and ~0.385" long. (Given that it seems to have been spec'd in imperial units, I wonder if the shaft would be considered 0.375"?) The fact that the terminals are on the back rather than side seems as if it would be an important point to look for. |
| Nusa:
Here's something that looks like it could work: https://www.bourns.com/docs/Product-Datasheets/3862.pdf You can probably find other brands with equivalent products. If you file a slot in the end of your broken shaft, you can probably adjust it with a screwdriver until you can replace it. |
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