Luxman A-384 replacing volume pot - diyAudio
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Old 15th August 2014, 07:29 AM   #1
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Default Luxman A-384 replacing volume pot

Hello everyone,
I have been experiencing some problems with the original volume pot from my Luxman A-384 : motorized Alps RK16312MC 150KBX2. I have cleaned it a few times but several hours after cleaning, I hear again scratches, volume ramps-up strangely... I am considering replacing the pot. I don't care for loudness taps. I have already ordered a tocos cosmos 50k log for another repair and I was wondering if this could fit my luxman. Volume pot is placed after tube pre ans before buffer in the integrated, VR201, see pictures. Maybe I should be careful and take a 100k log pot instead ? By the way, original pot is log or linear ? I am somewhat confused with designation by Alps... Thank you

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Old 15th August 2014, 10:22 AM   #2
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The extra contacts are for the "Loudness or Contour" switch. It modifies the sound shape.
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Old 16th August 2014, 12:10 AM   #3
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A scratchy pot is often a sign of leakage of the capacitors near the pot.

I would always replace the capacitors near the pot before even considering cleaning it. As DC on the POT can make very nasty scratches even with good pots. All Electrolytic capacitors on 20 year plus gear should be replaced as the chance of failure is very high.
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Old 17th August 2014, 05:55 PM   #4
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Hi owenhamburg! yes I was considering that but it would not explain why volume goes up strangely on one channel from time to time. I tried without the pot (bypass with two resistors on each channel) and it works perfectly... So I am considering replacing the pot...
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