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Thread: ART MPA Gold Gain pots issue + noise?

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    ART MPA Gold Gain pots issue + noise?

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    Hi,

    I have an ART MPA GOLD and am wondering if there is any DIY I can do about the jump in gain in the last 15% of the pot travel?

    Here is the MPA GOLD Schemo :-

    http://www.harmoniccycle.com/hc/imag...-schematic.pdf

    Would I be able to put in new better quality pots?

    Also, is there anything I could do about lowering the noise levels apart from swapping tubes?

    Thanks
    [url]http://www.richardpenrose.com[/url]

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    Quote Originally Posted by dickiefunk View Post
    Hi,

    I have an ART MPA GOLD and am wondering if there is any DIY I can do about the jump in gain in the last 15% of the pot travel?

    Here is the MPA GOLD Schemo :-

    http://www.harmoniccycle.com/hc/imag...-schematic.pdf

    Would I be able to put in new better quality pots?

    Also, is there anything I could do about lowering the noise levels apart from swapping tubes?

    Thanks
    You could change R214/R245 to larger values; that will reduce maximum gain but generally make the gain control more linear. 30 ohms would give up the last 6dB of gain, but the ART has a stupid amount of gain available anyway (+75dB), so no big loss. A change in R206/R236 might also be called for, but I don't have a recommendation, I'd have to experiment.

    The pot itself is a dual reverse log pot; those aren't too easy to find. It's possible to make one by hacking a dual audio taper pot though. Basically, you drill out the back of the shaft a little, just enough to loosen the parts, and swap the front and back pieces.

    The ART is already a fairly low noise preamp. The tube is a minor contribution to noise, because there are gain stages before it. If you need lower input noise, the easiest way would be to add a 1:4 transformer (keep the ART's input impedance set high if you do that).

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