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Old 5th April 2007, 08:41 PM   #1
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Question Old Alps pot for gainclone?

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
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Old 5th April 2007, 08:53 PM   #2
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Default another picture

picture of side
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Old 5th April 2007, 09:25 PM   #3
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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.
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Old 5th April 2007, 09:50 PM   #4
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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
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Old 5th April 2007, 10:06 PM   #5
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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.
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Old 6th April 2007, 01:21 AM   #6
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How old is the pot???
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Old 6th April 2007, 01:29 PM   #7
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_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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Old 6th April 2007, 01:29 PM   #8
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here's a link for the amp: http://www.hifigoteborg.se/Yamaha%20CA-2010%20spec.htm
in swedish...
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Old 6th April 2007, 02:22 PM   #9
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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!!
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Old 6th April 2007, 02:33 PM   #10
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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
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