ALPS model 87281 100KAX2 or NOBLE AP25 203Y GPHAN 25S 100K

I am looking for an ALPS model 87281 pot to use in my Audio Research SP9 pre-amp.
I purchased an ALPS pot model 1450 but the pins don't line up correctly to the control pcb. See image - the pot I want to replace is shown at top
Funny, because Audio Research says the original pot was a NOBLE AP25 203Y GPHAN 25S 100K, while the one that's currently there is the ALPS 87281.
Anyone Have a ALPS 87281, or a NOBLE AP25 available?
 
I worked for Noble USA from 1999 to 2001. I actually have a bunch of these AP25's pots if you are still looking for one.
 

Attachments

  • 20240203_112004.jpg
    20240203_112004.jpg
    389.8 KB · Views: 65
  • Like
Reactions: 1 users
Hi, can you please tell me what kind of pot this Noble AP25 is ie. volume, balance, etc? When I measure both sections, they don't behave like a standard volume pot. I cant find any specs on line for it either. It was sold to me as a stereo volume pot with loudness tap pins, but it doesn't behave that way at all.
 

Attachments

  • 20240429_134607.jpg
    20240429_134607.jpg
    500.2 KB · Views: 23
@chrisng Each deck of the pot does the exact opposite of the other. On the first deck, the resistance between the center wiper pin and the far CW pin stays close to zero ohms until the wiper is centered (12 o'clock), only then it starts to increase and goes to 100k in reference to the CCW pin. The second deck does the exact opposite, starting with 100k at full CW, going to zero ohms at wiper center (12 o'clock) position and remains at zero ohms for the remaining rotation all the way to CCW. This is why it behaves like it's a stereo balance pot. The 4th pins don't do anything and aren't connected at all.
 
  • Like
Reactions: 1 user