Volume pot question

Rohan1701

Rohan1701

New Member
I have an onkyo 4500 mkii that I am restoring. Almost there and invested a lot of sweat equity along with a fair bit of money. I only paid $25 for it.
I love the way it looks- so many lights… the volume pot is beyond cleaning and I would like to replace it. However I’m very cheap plus considering the money I’ve already spent. There’s one available on my favourite online auction site but I’d be looking at over $50 including shipping..
Does anyone know if another manufacturer used the same pot (or similar-that will work) on a different unit? It is marked 100Kohm BX2
Any thoughts would be appreciated!
 
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I’ve cleaned it several times now with contact cleaner. It feels like fingernails on a chalkboard when you turn it. Not smooth at all. In fact you can actually hear it it turn if it’s quiet in the room. After I clean it and let it dry for a few hours it will be fine for a couple of days then the crackling in the speakers returns.
 
if it's an ALPS pot, it should have the series number on it also. Unfortunately, a lot of those were specific to the application (custom design rather than open stock designs) so finding one may be a pain.

I have the same issue but worse with a KA-88, pot is toast even after cleaning, no contact on one side and the other intermittent and I've not seen a direct replacement yet.
 
I may eventually bite the bullet and spend the $50..
The last time I cleaned it I actually removed it from the board to get it at all angles. It seems to be better in that it’s not crackling.. but it still feels terrible. I’m sure the crackling will return sooner or later.
 
Be aware there is a seller on eBay selling pots at around $90? Check the Marantz forum, and elsewhere on AK, there has been a lot of disgruntled buyers saying the parts are crap!
 
Also, if you decide to buy from overseas, I would buy two. A lot of times you can get one with some imbalance
 
Well, Rohan1701, it would seem you probably trashed your volume control and possibly any other pots, if you were ill advised to spray them out with any brand contact cleaner, as those cleaners remove the all important mechanical control lubrication and can mess up the pot`s conductive coating inside, thus ruining or chancing to a perfectly good usable pot.

You should never, ever spray any pots with contact cleaner, even if God told you to !

Any switches or plugs/jacks/contacts of that nature, then the various contact cleaning DeOxit products are your friend.

DeOxit brand Fader Lube or the like is the only spray treatment that should be used on pots.

Good luck on fixing this preventive self imposed failure.
 
Bill Ferris said:
Well, Rohan1701, it would seem you probably trashed your volume control and possibly any other pots, if you were ill advised to spray them out with any brand contact cleaner, as those cleaners remove the all important mechanical control lubrication and can mess up the pot`s conductive coating inside, thus ruining or chancing to a perfectly good usable pot.

You should never, ever spray any pots with contact cleaner, even if God told you to !

Any switches or plugs/jacks/contacts of that nature, then the various contact cleaning DeOxit products are your friend.

DeOxit brand Fader Lube or the like is the only spray treatment that should be used on pots.

Good luck on fixing this preventive self imposed failure.
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Wow. You sure told me.
 
I would not have put it that way but it is important to use something with lubricant as a last step. I used De-Ox-Id on a volume control on a Technics SU-V707 and it is still working great. That does contain some lubricant but it smells horrible and must be used with ventilation.

Have you put any lubrication in that pot? Or is it so bad that one channel drops out at times?
 
coonmanx said:
I would not have put it that way but it is important to use something with lubricant as a last step. I used De-Ox-Id on a volume control on a Technics SU-V707 and it is still working great. That does contain some lubricant but it smells horrible and must be used with ventilation.

Have you put any lubrication in that pot? Or is it so bad that one channel drops out at times?
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Yes, sorry coonmanx. I was a little vague at first.
All pots were originally treated with fader lube and were fine with exception to the volume pot. It was really scratchy and terrible feeling from the get go. So fader lube to start with. Then I used contact cleaner a few times with touch of fader lube after it’s been allowed to dry. The last time I did it I removed it from the board figuring it’s toast anyways, I really doused it, used compressed air and lubed. It’s definitely better and crackling is barely noticeable when I change the volume now-but it’s there. I feel it will return after some time..
 
Are you talking about the TX 4500 mk II? Because I see one of those on the Bay currently for $24. The thing about getting the original part and not a brand new replacement is that you won't really know the condition of that pot until you get it.
Screenshot at 2022-01-01 09-07-18.png
 
Yes. $47 after shipping. I’ve been eyeballing it for a couple weeks now. Funny you mentioned it because I just pulled the trigger on it! Hopefully it’s not bad….
I’ve never seen a pot as bad as the one I have in it here. Thanks for looking into that.. just tallied I have $285 into this thing so far. I’m at the point of no return. Oops yes tx4500 mkii..
 
That one I posted up was $24 plus free shipping. Sorry if I don't understand how you got to $47. Was there another one?
 
Are you in the US? I’m in Canada. Maybe that’s why? That was the only one I saw on there… same item I believe ships from west field massachusetts.
 
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