Tubes Asylum

Conrad Johnson PV-10B: Stock Replacement Volume Pot Confirmation

24.147.214.52

tvr2500m

I'm considering replacing the volume potentiometer in a C-J PV-10B preamp. It's gotten noisy. I could try to clean it with some DeOxit, even take apart for examination and cleaning, but a new one is quite affordable. Can anyone please confirm the stock Alps part?
Alps RK27. 50K audio/log taper. Six pins. Round shaft. 20mm or 25mm shaft length??
Thanks.

Edits: 09/07/23

Follow Ups:

RE: Conrad Johnson PV-10B: Stock Replacement Volume Pot Confirmation - tvr2500m 14:21:17 09/14/23 (1)
I asked C-J about the potentiometer in my PV-10B; I sent them pictures to help them ID the part. They replied that it looks like the original potentiometer.
- RE: Conrad Johnson PV-10B: Stock Replacement Volume Pot Confirmation - Joe Appierto 14:59:45 09/14/23 (0)
  So, that's good -- now you know. Will you try cleaning it first or just replace it with a new pot?
  
  Joe
RE: Conrad Johnson PV-10B: Stock Replacement Volume Pot Confirmation - tvr2500m 11:42:10 09/07/23 (2)
I've a bit of a conundrum. The potentiometer currently in the preamp is an Alps RK27 50K. It appears to be original, not replaced/serviced. All the PV-10B schematics and parts lists list a 100K value. 100K is also what I've seen in several other C-J preamps I've had.

50K, 100K??

Thanks.
- RE: Conrad Johnson PV-10B: Stock Replacement Volume Pot Confirmation - Jonesy 20:26:09 09/07/23 (1)
  Trying to help you figure out the correct part and I see a similar discrepancy elsewhere in that CJ Users forum Joe referred to in his post. Albeit it's a different model number than yours. (link below)
  While reading through some other sites I noticed CJ removed balance controls on some preamp versions. It's possible they compensated for this with resistors, different value potentiometers, or both.
  Unfortunately schematics and parts changed on the fly for many high end brands of that era making it difficult to match up with your preamp date of manufacture and serial number.
  At this point you probably can't go wrong with replacing with the identical part if it's served you well.
  Or taking it apart and cleaning it.
  Jonesy
  Edit: had link and title reversed
  
  "I know just enough to get into trouble. But not enough to get out of it."
  - 50k or 100k (Open in New Window)
  Edits: 09/07/23
  - RE: Conrad Johnson PV-10B: Stock Replacement Volume Pot Confirmation - tvr2500m 19:25:06 09/09/23 (0)
    Thanks for the reply. Yes, great observations and thanks for making that survey. Agreed. It seems that what I've got is exactly how the preamp left the factory and it has always worked well and sounded great. Replace with the same part, or clean the existing one.
RE: Conrad Johnson PV-10B: Stock Replacement Volume Pot Confirmation - Joe Appierto 17:11:31 09/05/23 (2)
I'm sorry that I am unable to attach the schematic and parts list but another forum for Conrad Johnson Owners which does have those documents lists the volume pot for the PV-10B as 100K.
Joe
- RE: Conrad Johnson PV-10B: Stock Replacement Volume Pot Confirmation - tvr2500m 11:33:51 09/07/23 (1)
  Thanks for the help, Joe.
  - You're welcome - Joe Appierto 13:02:49 09/07/23 (0)
    Hope you get this solved soon.
    
    Joe

Post a Followup:

FAQ

Post a Message!

Forgot Password?

Moniker (Username):
Password (Optional):
	Remember my Moniker & Password (What's this?) Eat Me
E-Mail (Optional):
Subject:

Message:	(Posts are subject to Content Rules)

Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:	Automagically notify you when someone responds.

To view your new posting or follow-up, click on the RELOAD or REFRESH button on your browser.

This post is made possible by the generous support of people like you and our sponsors:

Sonic Craft