[HAM] B3 Swell Capacitor

[Jordan Kersten]

Well, just to be sure, I actually adjusted my pedal linkage to produce the lowest possiable output in its full position.  Still noise.  I will take the cover off and inspect the inside for loose parts.  Thanks guys!



----------------------------------------
> From: thermionic27609 at earthlink.net
> Date: Sat, 9 Feb 2008 10:19:12 -0500
> To: hammond at zeni.net
> Subject: Re: [HAM] B3 Swell Capacitor
> 
> Jordan,
> 
> 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.
> 
> On Feb 9, 2008, at 10:00 AM, Jordan Kersten wrote:
> 
>>
>> It is not a microphonic tube.  When the swell box is all the way  
>> up, you can tap on the tubes lightly and get to noise.  Tap on the  
>> swell box with the same amount of force, you can hear the taps and  
>> it will start to ring and have a low frequency feedback kind of  
>> sound and it will ring like this until you turn the pedal down.  It  
>> won't ring until it senses vibrations from the cabinet and it won't  
>> do it when the pedal is anywhere but in the full up position.   
>> Adjusting the link between the swell capacitor and the foot pedal  
>> didn't work.  Does it seem like something is loose in there?
> 
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