#1
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Cole Clark pre amp background hiss
Just recently got a 2nd hand Cole Clark Fat lady 2. It's a 2011 model and has the old style 2 way pick up / preamp.
One thing is really annoying me is a back ground hiss. Sort of more noticeable when I turn the gain up past half. None of the other controls seem to effect it either way ie biasing / blender towards either pick up. I contacted Cole Clark and got a really detailed and helpful email back. Initially the hiss was a lot worse and they suggested a new battery which did help the hiss and crackling immensely. A lot better now but still there. I have pulled the pre amp out. Plugged unplugged the pick up connections many times in case corroded. Touched up the battery contacts with a light sanding. Anyway after all that the hiss still there. Not serious but enough to be annoying. I've tried three leads. New Alkaline battery etc. I am in a fairly remote area and wondering if someone could give me any pointers or somewhere to look? Maybe its inherent with this pre amp? |
#2
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Its not an inherent problem, however if its at the stage where corrosion existed on the battery connections and pickup then its likely corrosion also exists internally on the circuit board.
Cole clarke do an exchange unit, that is you send them your unit and they will send you back a new one "costed" of course Steve
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Cole Clark Fat Lady Gretsch Electromatic Martin CEO7 Maton Messiah Taylor 814CE |
#3
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Quote:
Nothing else I could try? I don't suppose dabbing contact cleaner around a good idea |
#4
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Could you put a picture of the PCB? If it is sufficiently simple you might try replacing the resistors with low noise metal film.
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#5
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The PCB is in a sealed box which I possibly could open but I wouldn't be changing resistors etc. Would it be possible the PCB board is just dusty or something? Without removing / replacing components would it be worth cleaning it a bit maybe?
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#6
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Its actually a 2 layer circuit board that unless you had an Oscilloscope and circuit diagram you could not troubleshoot.
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Cole Clark Fat Lady Gretsch Electromatic Martin CEO7 Maton Messiah Taylor 814CE |
#7
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That sounds like a good trouble shooting step to me. Anything you can do to isolate the problem is forward progress. Too bad that simply sending the pre-amp back for repair/replacement is such a pain.....
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