Carbon stereo Pot 200k, 220k or 250k

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IslandPink
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#1 Carbon stereo Pot 200k, 220k or 250k

Post by IslandPink »

Chaps
Seems amazingly hard to buy, either New or on EBay -
Just need a good old-school carbon track potentiometer, dual-channel, at 200k to 250k value.
I have a box full of various myself but too many useless ones at 10k, mono ones , tiny ones etc.
Not fussed what it looks like , wattage not too important but the normal-sized ones with the plastic 'D' shaft are easiest to work with.
Let me know.
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#2 Re: Carbon stereo Pot 200k, 220k or 250k

Post by Ant »

Only thing I have that's even remotely close is a 500k stepped attenuator

Would that be any use?
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IslandPink
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#3 Re: Carbon stereo Pot 200k, 220k or 250k

Post by IslandPink »

Thanks for looking, but no.
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Richard Higgins
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#4 Re: Carbon stereo Pot 200k, 220k or 250k

Post by Richard Higgins »

Hi Mark
I searched for, 250k stereo potentiometer, on Ebay and got several, linear and log, from 3.49.
There is also an Alps 250k Stereo for 4.73 from China.

Cheers

Richard


Ah, are they carbon or wirewound?
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#5 Re: Carbon stereo Pot 200k, 220k or 250k

Post by IslandPink »

Well looks like I should search again then ! I doubt you'd get a wirewound at that sort of value though. I don't like the Alps ones - at least the blue ones. Many of the standard pots are cermet , which is some sort of conducting plastic track which doesn't sound nice.
If you have an example that looks like a carbon one, please post & I will check in later. Thanks !
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#6 Re: Carbon stereo Pot 200k, 220k or 250k

Post by IslandPink »

Yet another supplier selling everything BUT a dual 250k :
https://www.jaycar.com.au/passive-compo ... nce&page=2
I might end up making one at this rate - buy buying two single 220 or 250's and a shell from a dual 100k ....
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#7 Re: Carbon stereo Pot 200k, 220k or 250k

Post by SimonC »

Hi Mark,

Mouser UK have a 2 gang 250k carbon track alpha in stock if this is any use: https://www.mouser.co.uk/ProductDetail/ ... 3xXQ%3d%3d

Si
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#8 Re: Carbon stereo Pot 200k, 220k or 250k

Post by IslandPink »

Well spotted that man !
I was finding Mouser were promising, but must have missed that one due to lack of picture. Full-sized barrel, easy to work with. Smooth shaft too, 0.25" . I'll check my knob this evening :D
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Richard Higgins
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#9 Re: Carbon stereo Pot 200k, 220k or 250k

Post by Richard Higgins »

Another example;
https://www.ebay.co.uk/itm/Linear-Mono- ... _5I7hWUahA

If that does not include 250k and stereo use the drop down menus to select.

Sorry for delay in resp[onding, just back from lunch.

Cheers

Richard
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#10 Re: Carbon stereo Pot 200k, 220k or 250k

Post by steve s »

Mark I have a nos boxed 250k lin stereo pot, its a Norman one from the 60's with metal shaft...
If it's any use pm me your address.. but it will be next week b4 I can send it.
Cheers
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#11 Re: Carbon stereo Pot 200k, 220k or 250k

Post by IslandPink »

I was just about to jump on that offer, Steve , then I checked a couple of the pots I have upstairs, and the ali knob I bought . I'd missed the annoying fact that the older metal-shaft ones and some of the plastic ones ( too ) are 1/4" , whereas modern ones are 6mm. 'course the knob is 6mm internal.
I'd better look into the links Richard and Simon has sent me instead, even if it does mean buying 2 or 3 and selecting the best for channel balance.
Of course you might have a smart-looking knob to go with yours ? ...
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#12 Re: Carbon stereo Pot 200k, 220k or 250k

Post by pre65 »

I can ream 6mm to 1/4" if necessary.

1/4" = 6.35mm
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#13 Re: Carbon stereo Pot 200k, 220k or 250k

Post by IslandPink »

No, re-thinking again ! - those current ones just have the really short serrated shafts on - not very useful for going through a wooden amp surround. I'll get the internal bore of the knob taken out to 6.35mm at work.
I'll PM you Steve.
ps. I did use Google to search for 'Norman potentiometer' pictures and got a pic of Norman Wisdom.
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#14 Re: Carbon stereo Pot 200k, 220k or 250k

Post by steve s »

That's fine mark.. I may well have an old nob too .... in brown bakerlite !
The tube manual is quite like a telephone book. The number of it perfect. It is useful to make it possible to speak with a girl. But we can't see her beautiful face from the telephone number
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