PV6 balance potentiometer ; looking for

[latole]

Hello, I'm trying for a second time, my first topic was never published and I don't understand why.
Here is; I have a PV6 preamp whose balance potentiometer is defective.
I'm looking for a supplier of this part; a double potentiometer (2 gang) of 250K B (linear) with legs for printed circuit.
All my suppliers do not have this part.

For the moment I have installed fixed resistors of 120K and it allows me to use my system.

Do you have a reference for this part?

Thanks

[admin]

I don't have a parts number but we do have the PV6 in our schematics database so you may want to look at that here: https://www.conradjohnsonowners.com/vie ... 35ac432367

You may be able to find a a replacement by measuring resistance levels of the stock part and getting something similar.

[AnotherJohnson]

Although I recognize this comment as “not helpful,” it is worth noting that this is the kind of stuff that makes these 30+ year old units a risk. OEM Relays and pots are just not available. You might try cleaning with DeOxit. But it’s a stop gap measure that does nothing for wear.

Since balance is rarely changed, bypassing the balance control is another option. It sounds like that’s what you’ve tried.

[admin]

If balance is not being utilized, I would probably just bypass it as AJ suggested. It's a simple solution. I can't remember the last time I ever changed the balance setting from 1:1 on a piece of stereo equipment.

[Big Dog RJ]

Yep, agree with that as well.
If balance control is not too critical, just by-pass it. Then again, if the purpose of balance is to check if both channels are operating fine when connecting back gear, after perhaps a clean up or something, that can be ascertained by ear.
Although the balance control does help in this regard.

Hopefully you'll find the solution and part that is required, for now just enjoy those fine tunes!
Best, RJ

[roberto]

Partsexpress.com. https://www.parts-express.com/ALPS-RK27 ... ft-023-202

[AnotherJohnson]

Roberto to the Rescue!

Well, it’s not OEM, but it’s made in Japan rather than China.

And it’s not expensive. Can’t beat that .

[latole]

Thank you all my friends, I'll look at these.
I forget to activate subscribe topic

[latole]

Partsexpress.com. https://www.parts-express.com/ALPS-RK27 ... ft-023-202

I see this before ,it's audio ( linear) not B. It will not work.
I found some B that will work. They will need some work.

https://www.mouser.ca/ProductDetail/Bou ... ktUg%3D%3D

[latole]

Although I recognize this comment as “not helpful,” it is worth noting that this is the kind of stuff that makes these 30+ year old units a risk. OEM Relays and pots are just not available. You might try cleaning with DeOxit. But it’s a stop gap measure that does nothing for wear.

Since balance is rarely changed, bypassing the balance control is another option. It sounds like that’s what you’ve tried.

I do first with Deoxit ; Pot is not dirty, 250 K resistor is open

[latole]

If balance is not being utilized, I would probably just bypass it as AJ suggested. It's a simple solution. I can't remember the last time I ever changed the balance setting from 1:1 on a piece of stereo equipment.

I do as I wrote with 2 X 120 K resistors for each side left and right / pots
PV6 work fine. now I wish to keep it original

[latole]

The original one ;

[Big Dog RJ]

Nice work mate.

Like they say, if there's a will then there's a way!

Obviously you were on a mission to get it back to spec, looks like your hard efforts were not in vain. Cheers to CJ vintage gear, hope you're enjoying those fine tunes!

RJ

[latole]

Thank you,

I would like to eventually find a potentiometer closer to the original and remove my resistors. Maybe on European websites?

But for now, it works very well

[roberto]

https://www.ebay.com/itm/302582952887?_ ... BMtKCAhtxf

[latole]

https://www.ebay.com/itm/302582952887?_ ... BMtKCAhtxf

Thank ; it is a Audio pot A, it do not work as I wrote before , Thursday. I need a B pot, log

[latole]

2 different kind of pot

Audio pot or linear pot or A pot :

When balance knob is in the middle, 250 k pot resistor see, let say, 200k on one side and 50 k on the other side of the wiper.
You can' use it as a balance control, for volume it is ok

B pot or log or logarithmic;

In the middle for a 250 k , resistor will read 125K each side of the wiper.
For balance control that is what you need

[roberto]

https://www.ebay.com/itm/164961432434?_ ... BM9O6wwdxf

[roberto]

https://www.amazon.com/bangdan-Balance- ... 72&sr=8-31

[AnotherJohnson]

Captain Obvious here …

The OEM part may be available from CJ, but I suppose that’s little consolation since they generally won’t sell parts, but instead are willing to fix at the factory. With 3 hour minimum bench time charge.

Well, the service revenue stream is important. It’s a small company.

This is actually a pretty complicated part search. Center tap. Wiper diverting by X dB + AND - . These are difficult to match … and then you have the issue of how it sounds. The balance is in the audio circuit. That’s why they use discrete steps now instead of a wiper.

Maybe you could talk CJ into selling you one, especially if you are outside the US. You might try working through your official importer.