Facebook
Google
GitHub
Linkedin
Hello. Does anyone know what the name of this style of Trim Pot is? I am finding it very hard to locate a replacement. Any info will help. I need to replace with the same resistor.
Obsolete Trimming Potentiometers, what they are called and where to source them?
- Thread starter Allen Mills
- Start date
Trimmer
Trim Pot
Trim Potentiometer
That is an old style which is most likely obsolete. You will have to adapt using a newer style version, maybe from something like this one.
http://www.mallinson-electrical.com...-potentiometer-10k-10-kohms-linear-track.html
Centralab was known for the old style pots. Bourns and Vishay carry a lot of different styles of pots.
Trim Pot
Trim Potentiometer
That is an old style which is most likely obsolete. You will have to adapt using a newer style version, maybe from something like this one.
http://www.mallinson-electrical.com...-potentiometer-10k-10-kohms-linear-track.html
Centralab was known for the old style pots. Bourns and Vishay carry a lot of different styles of pots.
ElectricSpidey
- Joined Dec 2, 2017
- 3,315
I can't see very well, but it looks like it might need a shielded case. (but that could just be the wiper connection...I can't tell.)
takao21203
- Joined Apr 28, 2012
- 3,702
what is the PCB good for? I see SCR is this a TRIAC regulator?
Theres of course some on the market, usually they are 500K and have handle, they are larger than regular pots or trimmers.
I have never sourced them and dont know the keyword.
The original part, you can about forget about it, its house marked, after such long time they will no longer have it / no longer be in business.
Besides if you have the manual check for address / Tel.
Otherwise we need to investigate what the module is good for, what approx value of a POT may work, if it is a TRIAC board they usually have 500K might be less if it is 110V.
If it is broken anyway, remove it and open it, so we could check if it is carbon track or wirewound. Maybe possible to repair, or check the track with multimeter.
Theres of course some on the market, usually they are 500K and have handle, they are larger than regular pots or trimmers.
I have never sourced them and dont know the keyword.
The original part, you can about forget about it, its house marked, after such long time they will no longer have it / no longer be in business.
Besides if you have the manual check for address / Tel.
Otherwise we need to investigate what the module is good for, what approx value of a POT may work, if it is a TRIAC board they usually have 500K might be less if it is 110V.
If it is broken anyway, remove it and open it, so we could check if it is carbon track or wirewound. Maybe possible to repair, or check the track with multimeter.
Why do you need to replace it? Have you tried taking it apart and cleaning it? It might even be able to be repaired if all that is wrong with it is one of the leads came loose.
Allen Mills fwiw that looks like package style of small wire-wound (instead of carbon-track) pot (so designed for higher current/power). Anyhow, no matter what type it is, plz try treating it with high quality control cleaner (like DeOxId) b4 deciding it's burned out
!Probably made by CTS and probably wirewound. I looked at a scan of a 1991 CTS catalog. In the commercial 2 W wirewound trimmer section there is a photo of one marked with 137 underlined (can't see very clearly, I scanned as B&W). In the middle of something; will come back later with more info if I can find some.
37 years is ancient in electronics terms.
If you need a 2 W wirewound pot, it isn't going to be any different now than it was 37 or 47 years ago. I know of no new pot type introduced in the past few decades, just package variations. Even conductive plastic (high endurance and good characteristics, especially as hybrid with wire sound) was around 37 years ago.
37 years is ancient in electronics terms.
If you need a 2 W wirewound pot, it isn't going to be any different now than it was 37 or 47 years ago. I know of no new pot type introduced in the past few decades, just package variations. Even conductive plastic (high endurance and good characteristics, especially as hybrid with wire sound) was around 37 years ago.
Here is a CTS trim pot on eBay:
https://www.ebay.com/p/CTS-Potentiometer-Pot-115JP300C202A1-2k-Ohms-Trimpot/1851454666
https://www.ebay.com/p/CTS-Potentiometer-Pot-115JP300C202A1-2k-Ohms-Trimpot/1851454666
I had another look at the CTS catalog and can't find anything more helpful. I suspect 140 is a series number. There are very few full part numbers in the catalog, but typically the last three digits are resistance as digit digit exponent. 685 would be 6.8 megohms, which would be pretty much impossible with wirewound. There is nothing in the CTS catalog that matches the mounting type.
Does 137 really have anything to do with CTS? I'm guessing it does, but I really don't know. Sprague used a 2 in a circle as a logo, so maybe CTS used 137 to identify itself. CTS is still in business, so it might be worth sending them the photo and asking.
Returning to the question of why it is thought to be defective: If indeed it is wire wound, it could feel and sound quite rough when turned. Low resistance types are wound with rather large diameter wire and the wiper bumps its way along. Cleaning may help. WW pots are sometimes lubricated and old soap-oil grease (the vast majority of greases are soap & oil) can separate and harden.
Does 137 really have anything to do with CTS? I'm guessing it does, but I really don't know. Sprague used a 2 in a circle as a logo, so maybe CTS used 137 to identify itself. CTS is still in business, so it might be worth sending them the photo and asking.
Returning to the question of why it is thought to be defective: If indeed it is wire wound, it could feel and sound quite rough when turned. Low resistance types are wound with rather large diameter wire and the wiper bumps its way along. Cleaning may help. WW pots are sometimes lubricated and old soap-oil grease (the vast majority of greases are soap & oil) can separate and harden.
