Do you recognize the brand of these potentiometers?

Hi,
I am working with an old Groove Tubes Bass Pre (purportedly designed by SWR), that has been in storage and the pots and sliders are awfully "scratchy".

I would like to locate replacement parts in case the controls  do  not come back to life by being twisted, turned, and slid about.

I am hoping someone may recognize the labeling and point me in the direction of the original parts manufacturer.

Thank you.

Look like alpha pots

not sure about that.

It does look vaguely familiar but there are (were) lots of cheap pot makers in Taiwan and mainland China last century when I was working in those ditches.

Purchasing was always finding new pot vendors who were too cheap to work right.

JR

Thanks for the efforts.

Is it naive to think that there may be a standardized form factor in use that will allow for convenient replacement with another brand?

Thank you.

trans4funks1 said:

Thanks for the efforts.

Is it naive to think that there may be a standardized form factor in use that will allow for convenient replacement with another brand?

Thank you.

Click to expand...

I don't think so..... Pucho posted a link to a bunch of GT schematics and manuals recently but I forgot where.....Maybe there is a part reference somewhere in there if you're lucky....Then you could look it up and get the dimensions to zero in on something.....


found the site...

https://aspenandassoc.com/schematics/

trans4funks1 said:

Is it naive to think that there may be a standardized form factor in use that will allow for convenient replacement with another brand?

Click to expand...

Pots like that (drop in replacements) use to be very common but within the last few years that have steadily been removed from the major electronic supply houses. But you should be able to find them on sites for guitar amp parts, Ebay or places like smallbear electronics.

B50K means 50 Kohms linear taper which is quite common:

Alpha Single-Gang 16mm PC Mount Vertical

Also you need to consider shaft type.

This place has a few guitar related pots..I've posted this link before....ASHLY recommended them to me so, they are trustworthy I'm guessing...

You need to know what dimensions you need ???

http://www.eyguitarmusic.com/Potentiometers_c_93.html

Get *good* pots which fit the panel holes. Solder short wires to the terminals and run them to the PCB. More reliable, and you don't have to hunt for exact terminal dimensions.

And , if needed, Just make sure the shaft length works and, if you plan on using the same knobs, the shaft diameter is good enough....

Maybe this???

https://www.ebay.com/itm/Fender-SWR-SM400-STUDIO220-AMPLIFIER-50K-POT-LINEAR-POTENTIOMETER-NEW-0066758000-/132451642283?_trksid=p2349526.m4383.l4275.c1#viTabs_0


Is SWR still around??? You could reach out to them...or Fender

SWR 220

scott2000 said:

Is SWR still around??? You could reach out to them...or Fender

Click to expand...

Nope, and last I checked there was no support.

Thank you to everyone for all the helpful suggestions.

Thank you!