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Marantz Volume Potentiometers--what swaps with what?

EastPoint

Recycler
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I just picked up 3 Marantz parts units today--a 2230, 2245, and 2250B. They are all missing knobs and are not happy. The 2230 and 2245 are missing their volume pots, but I think the 2250B has it. I see a number of volume pots on eBay--2225, 1070, 2220B. They all seem to be 250k stereo pots. They have loudness taps so I don't think I can just swap in a generic volume pot, unfortunately.

How interchangeable are these? Will any of the ones on eBay (2225, 1070, 2220B) work in the 2230 or 2245?
 
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There are 50,250 and 500K regular style wired volume pots and then the ones that mount directly to the circuit board.
I believe,but not down at shop right now,the 2245 and 2270 pots are the same.
You can look in the service manuals for the values.
The 250K are most commonly sourced and the 50K more scarce.
Obviously they all have the same loudness tap.
I can look in the morning if that helps and also have some.

Bob

ps. did you find the 2275 power switch?
 
Hi Bob. I ordered a power switch, thank you.

With the 250k switches, some have slightly different part numbers, but are they interchangeable anyway?
 
Here are a few pics....
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There are P/N variations among the 250Kx2 pots with loudness taps but the only critical matter is the shaft length which on these is approximately 17mm of actual aluminum shaft.

The only ones that you referenced that probably won't work are the 1070 pots as I believe the shafts are shorter because the 1040/1060/1070 and 1090 front panels bolt up tight against the chassis.


Bob
 
Perfect, thank you. As long as we're here, I need a power switch for the 2245 as well. Is there a new one out there?
 
Hi all

I dig that post up because its the closest one treatiing of my issue .

I recently got a 1060 , the volume pot was gone ( it made noise from the metal wipers scratching onto the carbone tracks and was giving trouble to have a stable good sound in both channels ) , i therefore decided to change it , got an alp blue 250 k and a khozmo 250 k from a friend , for now i tried the blue alp because the Kozmo is slighty too big to fit in there ( i might get to fit it in when i fully dismantle the amp on a future planned recap ) .

Both of those new pots have 6 pins ( i mean 3 times 2 since they are dual ) , but the original pot had 6 pins in front plus 2 wires at back ( red and white ) , now since the 1060 has loudness tap volume feature ( couldnt find much infos on the topic ) i just wrapped those two wires together ( unconected to each other thougth ) and just dealt with the 6 frontal pins rewirering as they were on the original pot regardless of the two back pins .

Now I face two different issues , sound quality seems to be overall somehow affected by the pot change , its hard to describe ,but i fell it doesnt sound as sweet as it did before the operation . Also the loudnees push button doesnt do anything when its pressed , I never uses loudness anyway , but it would seem that the sound has a mild loudness on it .

Using the alp blue is tricky i read you should purchase several to find a decent one , a friend had those lying around so I didnt have much options he only had the one ... Could the alp blue random quality be responsible for the poorer sound quality ?

Those two extra wires on the original pot , wich i still believe are responsible for loudness tap , do they need to be left as it is or do they need to be connected together ? I guess that might be source of my issue , its late here but I thought I might aswell ask before bed time I migh just try connect them in the morning !

Thanks in advance for your thoughts !

Happy hollidays
 
The other two wires are for the loudness tap, yes. Do not connect them together. If you have a new pot without a loudness tap, just tape off both wires separately.
 
ok thanks very much for the fast reply , I ll try the kohzmo outside of the amp then to see if the alp blue i have is responsible for sound change ..
 
A volume control should not make any difference in the sound. Attaching those two wires to each other probably did though.
 
i was planning on attaching those wires but never did !

Sorry ifor my English , I am trying to be precise as much as i can when explaining my problem but dont always nail it ...
 
Hi all does anyone have a good color code for the balance and volume controls for the 2230? Some cut the balance control out and now trying to figure out exactly how it supposed to go back in. I put in but have not balance to left or right stays the same so I know it’s not correct. Any info would be greatly appreciated
 
Ben helped me out so much with the balance control for a 2230 that I could not find anywhere. Not only did he help me with the install he made a great drawing so I could see how it went In. Someone had bypassed the balance control and cut it out. Now balance is working great! Appreciate the help Ben a great man!
 
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