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Old 14th July 2004, 10:55 AM   #1
Kriskom is offline Kriskom  Indonesia
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Default ALPS Potentiometer

I purchased a new ALPS Potentiometer Blue plastic casing, Dual/Stereo single metal shaft Type RH2702 , value 254 (250K) , clicked type .
It is brand new (maybe NOS).
Anyone who can advise me on the following :

Q1. Completed installation , it produced always a sharp cracks at the right channel at around 3O'clock position when I turn the shaft
Left channel remains silent.
What happened ? Is this defect ?
Q2
Pin3 connected to input , Pin2 as output to Line Valve 12AT7 , Pin3 as ground. There is a pin4 unmarked ,
What is this for , I assume this is probably for a Loudness circuit.
Q3
Have tried to search more info on this, but not available

Anyone who can help me ?
Thanks a lot
Paul
pyahya@cbn.net.id
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Old 14th July 2004, 12:42 PM   #2
dhaen is offline dhaen  Europe
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Q1 Probably a defect
Q2 Probably a loudness tap
Q3 It seems to be available from some Japanese web sites, but as you say, it's not a standard Alps part number. Perhaps it's an OEM part.
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Old 14th July 2004, 01:08 PM   #3
tiroth is offline tiroth  United States
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I think they are just Chinese fakes, but some of them are supposed to be quite nice (the ones that are stepped, not just detented).
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Old 5th August 2004, 11:34 AM   #4
Kriskom is offline Kriskom  Indonesia
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Dear colleques
The ALPs is now OK.
It appears a genuine old NOS . I have dismantled it, cleaned it rather harshly with a drop of HCl acid, extra fine sandpaper , cleaning fluid . All the resistors are OK and Its performing perfectly.
Thanks for the response
Paul
pyahya@cbn.net.id
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Old 5th August 2004, 11:38 AM   #5
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Did you buy them on Ebay?

Cheers

Andrea
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Old 7th August 2004, 09:32 PM   #6
jhead is offline jhead  United States
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I believe I seen you say resistors if your pot has very small discreet resitors it is probably the chinese knockoffs I believe the legit Alps blue were only manufactured useing conductive plastic film which means it would have a smooth wiper
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Old 8th August 2004, 04:43 AM   #7
Kriskom is offline Kriskom  Indonesia
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Dear Colleque
Yu culd be right at all.
I have checked ALPS product web page, I culd not find a stepped (with resistors)pot meter as one of their products, the more I am also not a NOS expert (sort of a antique hunter) when it comes to select NOS things.
But its the satisfaction I got from able to fix the problem, the sound is not bad at all, much better than the previous Noble.
See ya.
Paul
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Old 13th December 2009, 05:51 PM   #8
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about this thread you will find a little overview about potentiometer and rotary switch
Potentiometer Overview - Alps, Penny+Giles, TKD and Vishay and more, what's your fav?
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