Alps Blue potentiometer

lordnikon · 3696

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Offline lordnikon

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on: May 28, 2014, 01:11:33 AM
I know this has been posted before but I couldn't find the exact specs.

I want to change the stock potentiometer to the Alps Blue Pot to rectify the non-linear gain at low levels. I've been told it comes in different versions and also length of the shaft also varies. Which version should I get such that no modifications are needed for it to fit the Crack?

http://www.alps.com/WebObjects/catalog.woa/E/HTML/Potentiometer/RotaryPotentiometers/RK271/RK271_list.html

I searched on Mouser and they don't carry it. 

http://angela.com/alpspotentiometerbluevelvet100kstereo.aspx Out of stock.



Offline Grainger49

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Reply #1 on: May 28, 2014, 02:32:43 AM
The stock value of 100k Ohms is in the center of the range.  You can use any Audio Taper Dual (stereo) pot from 50k Ohms to 200k Ohms.  I cut the shaft if it is too long.


Offline lordnikon

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Reply #2 on: May 28, 2014, 02:46:28 AM
Thanks but I don't have the tools  to do the job. I rather find a pot with the same dimensions.


Offline Grainger49

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Reply #3 on: May 28, 2014, 03:03:28 AM
That is a good excuse to buy a Dremel Tool.


Offline Karl5150

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Reply #4 on: May 28, 2014, 03:08:51 AM
I put one in my SEX 2.1 and built one into my Crack. Both are 100K, the one in the SEX is working well and the #s check out on the Crack. (Haven't heard it yet.) My mistake was not checking and getting the ones designed for board mounting. I just tinned the pins, used some vintage flux paste and let the solder do its thing. PartsConnexion (no interest) had a good price and good delivery. They also have nice gold plated brass knobs that fit right on and IMO look good with brass screws on the panel. Good Luck

Karl
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Offline lordnikon

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Reply #5 on: May 28, 2014, 03:28:44 AM
Quote from: Karl5150 on May 28, 2014, 03:08:51 AM
I put one in my SEX 2.1 and built one into my Crack. Both are 100K, the one in the SEX is working well and the #s check out on the Crack. (Haven't heard it yet.) My mistake was not checking and getting the ones designed for board mounting. I just tinned the pins, used some vintage flux paste and let the solder do its thing. PartsConnexion (no interest) had a good price and good delivery. They also have nice gold plated brass knobs that fit right on and IMO look good with brass screws on the panel. Good Luck

Awesome. Thanks


Offline Paul Birkeland

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Reply #6 on: May 28, 2014, 06:01:36 AM
With a couple of resistors added to the stock circuit, channel imbalance at low levels can be remedied.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Joshewah

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Reply #7 on: May 28, 2014, 06:05:18 AM
Wouldn't lowering the volume of the source and increasing the volume of the amp work just as well? 


Offline Grainger49

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Reply #8 on: May 28, 2014, 09:44:53 AM
That is what the resistors do.  Not every source has a variable output level.  My DAC doesn't, my Eros doesn't but my Yamaha CT-800 does.


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