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I open my CS900 Peavey power Amp to service. This is when I realised that One Gain Pot is B50K and one is C100K. Is this normal or has it been changed ? the Two Gain Pot looks like it is not the Original Pot as it is Abundant in the common Market.If I were to replace it, what figure is the best ? Thank you in advance for your answer.

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Firstly, the two kinds of currently available pots are A and B, these are logarithmic (A) and linear (B) in their function.

Older pots were marked differently though, it used to be that linear was marked A, and logarithmic marked C.

A gain control should use a logarithmic control ( A, in the new coding system, or C in the older system ) so there's nothing wrong here.

As for the value to use, I would suggest replacing with 100K, the same value as the pot marked with the C, as this is an older marking code this pot was probably in the circuit originally and the 50K pot marked with the A probably found it's way in there in the more recent past.

I hope this helps

Posted on Apr 05, 2011

Testimonial: "Thank you very much Im555 for your Professional answer.I will surely replace the B50K with another new C100K. so that it is Identical Left / Right Ch"


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