[HAM] B3 Swell Capacitor

[Scott Hawthorn]

At 06:24 PM 2/10/2008, David Anderson wrote:

>Yes, checking the 12AX7 is a good idea--so good, in fact, that I
>suggested it yesterday ;-)

Yes, well, hrmmph, I read your excellent post yesterday, and here it is :-)

>It sounds like your swell capacitor or something in the box is acting
>as a capacitor microphone.
>
>I don't want to patronize, just cover all the bases, but when you say
>that the range of travel is correctly adjusted, I assume that you
>mean that the maximum expression pedal position is adjusted for
>maximum output from the preamp, not maximum range of mechanical
>movement. The mechanism will move past the point of maximum output
>and will cause noise at that point. I set mine by watching the output
>on an AC voltmeter.
>
>It's not that hard to take the swell capacitor housing cover off to
>make sure something hasn't worked loose. Also, check the screws
>underneath the preamp that hold the ring terminals to the swell
>capacitor contacts. I have seen these looser than they should be.
>
>I tried tapping the housing on mine and heard no noise through the
>speakers.
>
>
>David A.



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