Old Alps pot for gainclone?

henrikwidth · 5th April 2007, 09:41 PM

Hi all!

I found an alps pot in an _old_ and broken Yamaha integrated amplifier. I was planning on using it as a passive preamp for my dual mono gainclones from audiosector (premium LM3875) Does anyone have any experiences with this pot and my amps?

Best regards

Henrik

henrikwidth · 5th April 2007, 09:53 PM

picture of side

Sonusthree · 5th April 2007, 10:25 PM

Hi Henrik and welcome to the forum!!

It looks a lot like a 'Black beauty' except that it it seems to be for more than two channels and maybe five.
Was the Yamaha integrated a surround amp (for home cinema) or is their a balance control? E.G. Does the outside dial control channel balance and the inside controls volume.

The Black beauty is quit an expensive pot. I have the cheaper 'Alps Blue' and that is very good. I haven't tried the 'black' yet.

The 53K should be suitable. Do you know your source impedance?

Martin.

henrikwidth · 5th April 2007, 10:50 PM

Hi Sonusthree

Thanks for answering!
Yes, the outer ring is for balance control and the inner is volume, The amplifier from which I got it is a big stereo amp, 30W class A or 200W class something (selectable)

Are there documentation available for these pots? I've tried to search, but my google-fu is a bit low..

Henrik

Sonusthree · 5th April 2007, 11:06 PM

I've heard somewhere before that the 'Black beauty' is discontinued but I'm not exactly sure.

I think that your pot is a probably a custom model based around the RK27 on this page:

Alps Japan Potentiometers

Google is your friend.

Leolabs · 6th April 2007, 02:21 AM

How old is the pot???

henrikwidth · 6th April 2007, 02:29 PM

_very_ old, ill bet it's older than 15 - 20years...
The model it's from is "Yamaha neutral sound amplifier CA-2010"

henrikwidth · 6th April 2007, 02:29 PM

here's a link for the amp: http://www.hifigoteborg.se/Yamaha%20CA-2010%20spec.htm
in swedish...

Sonusthree · 6th April 2007, 03:22 PM

That amp looks at least 20 years old so the pot may be a little worn and noisy but there is no way to know except to try it.

It's quite easy to wire it up and test so why not make a quick prototype. It might just sound fantastic!!

henrikwidth · 6th April 2007, 03:33 PM

Yeah.. as I said it is _old_

I'll try to wire it up, but I'm still looking for a wiring-diagram..

I know the top two rows are for the balance, but I'm not sure I'll be using that.. or..?

Henrik

6th April 2007, 03:22 PM	#9
Sonusthree diyAudio Member Join Date: Dec 2005 Location: Brighton,UK	That amp looks at least 20 years old so the pot may be a little worn and noisy but there is no way to know except to try it. It's quite easy to wire it up and test so why not make a quick prototype. It might just sound fantastic!! __________________ Martin + + =

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5th April 2007, 10:25 PM	#3
Sonusthree diyAudio Member Join Date: Dec 2005 Location: Brighton,UK	Hi Henrik and welcome to the forum!! It looks a lot like a 'Black beauty' except that it it seems to be for more than two channels and maybe five. Was the Yamaha integrated a surround amp (for home cinema) or is their a balance control? E.G. Does the outside dial control channel balance and the inside controls volume. The Black beauty is quit an expensive pot. I have the cheaper 'Alps Blue' and that is very good. I haven't tried the 'black' yet. The 53K should be suitable. Do you know your source impedance? Martin.

5th April 2007, 10:50 PM	#4
henrikwidth diyAudio Member Join Date: Mar 2007	Hi Sonusthree Thanks for answering! Yes, the outer ring is for balance control and the inner is volume, The amplifier from which I got it is a big stereo amp, 30W class A or 200W class something (selectable) Are there documentation available for these pots? I've tried to search, but my google-fu is a bit low.. Henrik

5th April 2007, 11:06 PM	#5
Sonusthree diyAudio Member Join Date: Dec 2005 Location: Brighton,UK	I've heard somewhere before that the 'Black beauty' is discontinued but I'm not exactly sure. I think that your pot is a probably a custom model based around the RK27 on this page: Alps Japan Potentiometers Google is your friend.

6th April 2007, 02:21 AM	#6
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	How old is the pot???

6th April 2007, 02:29 PM	#7
henrikwidth diyAudio Member Join Date: Mar 2007	_very_ old, ill bet it's older than 15 - 20years... The model it's from is "Yamaha neutral sound amplifier CA-2010"

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