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Old 7th January 2011, 09:11 PM   #1
b0ri5 is offline b0ri5  Italy
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Default Could anyone help me with these old pots?

Hi,
I am trying to repair my old Nad 3030 integrated amp. I would change the old pots, but I can not find the right ones.

Click the image to open in full size. Click the image to open in full size.

Here are all the information that I got
  • Volume pot 805b 50kbx2
    Click the image to open in full size.
  • Bass- Treble pots 923h/8d2b 50kbx2
    Click the image to open in full size. Click the image to open in full size.
  • Balance pot 923a 250kw
    Click the image to open in full size.

Here's the service manual
Nad_3030 service manual

I really do not know where I can buy new ones.
Thank you

Last edited by b0ri5; 7th January 2011 at 09:18 PM.
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Old 7th January 2011, 09:46 PM   #2
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The outside dimensions of the screw threads, the distance between legs, and the distance between the back of the mount flange and the leg at the circuit board level would be useful.
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Old 7th January 2011, 10:35 PM   #3
DF96 is offline DF96  England
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Do they need changing? Have you tried switch cleaner?
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Old 8th January 2011, 10:11 AM   #4
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Default Take care of them

Hi
I think its nearly impossible to buy them nowdays. The bproblem is the 4th wire that I think is used for loudness in your amplifier. At least its like that in som HK recievers from the 70s. So try and clean them with deoxit or something like that. There are good thread about cleaning pots
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Old 8th January 2011, 10:39 AM   #5
b0ri5 is offline b0ri5  Italy
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Quote:
Originally Posted by indianajo View Post
The outside dimensions of the screw threads, the distance between legs, and the distance between the back of the mount flange and the leg at the circuit board level would be useful.
These are some photos(tried my best ).
  • Balance
    Click the image to open in full size.
  • Bass- Treble
    Click the image to open in full size.
  • Volume
    Click the image to open in full size.


Quote:
Originally Posted by DF96 View Post
Do they need changing? Have you tried switch cleaner?
I have already tried to open them but I really don't know how.
They have also a wrong impedance (due to age, I think). For example volume pot now is 40k instead of 50k
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Old 8th January 2011, 11:47 AM   #6
DF96 is offline DF96  England
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No need to open them, just squirt it in through a hole. If you want to open them then just bend back the metal tags but be careful because you may not be able to get them back together neatly.

It is unusual for a pot to reduce in value as they are basically carbon resistors. Maybe just a tolerance issue - they might be 20%? 40K will work fine instead of 50K.
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