Noice on 1959 SLP presence control

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Mats A
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Noice on 1959 SLP presence control

Post by Mats A » Wed Oct 02, 2013 5:02 pm

I wonder my new 1959 SLP Vintage Reissue has a noice when turning the presence control. According to my brother who knows electronics old Marshalls had some kind of voltage on the presence Control wich make them sound like that. The noice is at the same volume whatever volume i have on the amp. Is it so or is there some thing wrong like a bad pot.

catalin gramada
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Re: Noice on 1959 SLP presence control

Post by catalin gramada » Wed Oct 02, 2013 8:18 pm

It is in the end of long tail 5 k resistance to ground. you have DC through those circuit. it is very normal to hear a scratch when you turn it. If you are disturbed by that can replace the standard 1959 presence circuit to 2203 type one. suposed to be as same in effect they are not quite as same in tone.
Catalin
Catalin

Mats A
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Posts: 407
Joined: Mon Jan 14, 2008 5:32 pm
Location: Västerås Sweden

Re: Noice on 1959 SLP presence control

Post by Mats A » Thu Oct 03, 2013 10:40 am

catalin gramada wrote:It is in the end of long tail 5 k resistance to ground. you have DC through those circuit. it is very normal to hear a scratch when you turn it. If you are disturbed by that can replace the standard 1959 presence circuit to 2203 type one. suposed to be as same in effect they are not quite as same in tone.
Catalin
What is the difference in tone between the circuits?

catalin gramada
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Re: Noice on 1959 SLP presence control

Post by catalin gramada » Fri Oct 04, 2013 2:07 am

using the same cap you drop the same freq, but it will react little different
Catalin

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