[HAM] B3 Swell Capacitor

[David Anderson]

Scott,

You're right. I did write the suggestion, but I was having trouble  
with my router yesterday losing contact with the DSL modem, so the  
message languished in the Outbox without being sent. I assumed it had  
gone out....too much going on at once.

David


On Feb 10, 2008, at 9:47 PM, Scott Hawthorn wrote:

> 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.