Could anyone help me with these old pots?

b0ri5 · 09:18 PM

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.

Here are all the information that I got

Volume pot 805b 50kbx2
Bass- Treble pots 923h/8d2b 50kbx2
Balance pot 923a 250kw

Here's the service manual
Nad_3030 service manual

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

Thank you

indianajo · 7th January 2011, 09:46 PM

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.

DF96 · 7th January 2011, 10:35 PM

Do they need changing? Have you tried switch cleaner?

uffearon · 8th January 2011, 10:11 AM

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

b0ri5 · 8th January 2011, 10:39 AM

Quote:

Originally Posted by indianajo

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
Bass- Treble
Volume

Quote:

Originally Posted by DF96

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

DF96 · 8th January 2011, 11:47 AM

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.

7th January 2011, 09:11 PM	#1
b0ri5 diyAudio Member Join Date: Nov 2010	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. Here are all the information that I got Volume pot 805b 50kbx2 Bass- Treble pots 923h/8d2b 50kbx2 Balance pot 923a 250kw 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.

7th January 2011, 09:46 PM	#2
indianajo diyAudio Member Join Date: Jan 2010 Location: Jeffersonville, Indiana USA	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. __________________ Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,SP2-XT's, T-300 HF Projs, Steinway console, Herald RA88a mixer, Wurlitzer 4500

8th January 2011, 10:11 AM	#4
uffearon diyAudio Member Join Date: Apr 2010	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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7th January 2011, 10:35 PM	#3
DF96 diyAudio Member Join Date: May 2007	Do they need changing? Have you tried switch cleaner?

8th January 2011, 11:47 AM	#6
DF96 diyAudio Member Join Date: May 2007	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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