icar 100K pot
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icar 100K pot
i just replaced the icar pot in my late 60's/early 70's vox wah. it say 100k on the pot. however, i checked it with a mutlimeter and measured 500k. has anyone else found this?
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Re: icar 100K pot
They tend to drift up over time and I think how much usage it has seen . I have two old Vox wahs, ICAR in one measures 190K ohms and the other 290K
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Re: icar 100K pot
Mine measures 241k (it says 100K on the pot like yours)...
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Re: icar 100K pot
wow. thats nuts. it never even occurred to me that it could have drifted that much.
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Re: icar 100K pot
Carbon resistors can drift up over time as well . Usage wears the resistive carbon track which IIRC will also contribute to this increased resistance. Notice that some of the replacement ICAR pots are 200K to replicate an old used wah pot.
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Re: icar 100K pot
I resume this long gone post to discuss with you about old icar pots. I've got one of the first clyde mc coy wah from 1967 it has epoxy on the circuit to hide it. It works but the pot is a little scartchy. So i bought a replacement from Rmc. Then i replaced it and measured... Well it drifted to 6.2 M!
When i replaced it with the rmc one.. The wah didn't work well. The effect was very weak.. So i don't know what to think.
My thec told me that according to him it was way more than 100k till the start. Maybe 2or 3 M. It was written 100k to create confusion.
When i replaced it with the rmc one.. The wah didn't work well. The effect was very weak.. So i don't know what to think.
My thec told me that according to him it was way more than 100k till the start. Maybe 2or 3 M. It was written 100k to create confusion.
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Re: icar 100K pot
6.2 M ! Sounds like the pot is shot. Good to grab a few to try , tapers seem to vary...
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Re: icar 100K pot
I re istalled the icar one.. Amd the sound is there! Jimi for sure!
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Re: icar 100K pot
Fever Dog wrote:i just replaced the icar pot in my late 60's/early 70's vox wah. it say 100k on the pot. however, i checked it with a mutlimeter and measured 500k. has anyone else found this?
What did your wah sound like before it started giving you problems?
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Re: icar 100K pot
Hi the wah was wonderfull but the scratchy pot..
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Re: icar 100K pot
In that case may be there is an option to clean the pot? Sounds stupid for a 45 years old pot, but there is always a hope
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Re: icar 100K pot
I ask because maybe that famous sound we are after is truly coming from the 500k pot and not the the so called 100k.
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Re: icar 100K pot
I think the same thing... How is that with 200k the wah doesn't sound a t all!??axeman wrote:I ask because maybe that famous sound we are after is truly coming from the 500k pot and not the the so called 100k.
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Re: icar 100K pot
Can you post some pics of this wah with a 6.2 M ohm pot?
Wah does not need all that range of a pot, It uses actually some small portion of the "trace" of the pot. May be the 6.2 M Ohm pot is a special LOG type or something like it, and when the Wah at max, you get only like 200k-300k of a resistance? Can you check the resistance when the wah on the max?
Wah does not need all that range of a pot, It uses actually some small portion of the "trace" of the pot. May be the 6.2 M Ohm pot is a special LOG type or something like it, and when the Wah at max, you get only like 200k-300k of a resistance? Can you check the resistance when the wah on the max?
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Re: icar 100K pot
6.2M seems me crazy (or shot), possibly you measured in the wrong way? did you measured when the pot was desoldered and alone?
BTW, yes, it's normal for them to drift from nominal 100K to two or three times..mine (68) is around 300k, don't remember exactly.
Unfortunately it is also normal for it to be a bit scratchy..all of them are like that more or less..it's something you have to live with, like the presence pots of marshall. That is due to design of the carcass which leaves too much gap and dust enters too easily in the traces. Surely you can clean it , but after 2 or 3 weeks it starts back again. I dunno if there are some tricks to mitigate that.
I have tried too to replace it with aftermarket pot (200K), no scratch, but in noway it sounds the same anymore ..sounds weakier, just like you said. Poor us vintage nuts!
BTW, yes, it's normal for them to drift from nominal 100K to two or three times..mine (68) is around 300k, don't remember exactly.
Unfortunately it is also normal for it to be a bit scratchy..all of them are like that more or less..it's something you have to live with, like the presence pots of marshall. That is due to design of the carcass which leaves too much gap and dust enters too easily in the traces. Surely you can clean it , but after 2 or 3 weeks it starts back again. I dunno if there are some tricks to mitigate that.
I have tried too to replace it with aftermarket pot (200K), no scratch, but in noway it sounds the same anymore ..sounds weakier, just like you said. Poor us vintage nuts!
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