[HAM] B3 Swell Capacitor

[Jordan Kersten]

Well, it was not the tubes.  It also was not even the swell capacitor box.  It was the matching transformer!  Being I did all my trouble shooting on the spot at the gig friday night, I couldn't really get an accurate diagnoses as to the problem.  I went back during the day on Sat and spent about an hour with it.  I figured it wasn't the tubes because when I tapped on the tubes, no problems.  If I would tap on the swell box, bingo I got this feedback noise.  Anyway, all the parts inside the swell box were nice and tight so I was stumped.  I then started messing with the transformer.  If i took the metal shield off, the problem went away.  When I put the shield back on, there came the feedback sound.  If I got that metal shield in just the right spot, it wouldn't make the noise.  What I ended up doing was keeping the shield on and bending the "L" mounting bracket that attaches the transformer to the cabinet.  I bent it just slightly toward the side of the cabinet.  I guess the transformer was vibrating on the metal bracket because when I bent it in, the problem went away.  I have never had this problem or herd of this problem before.  Has anyone ever experienced this?



----------------------------------------
> From: mtcasino at comcast.net
> To: hammond at zeni.net
> Date: Mon, 11 Feb 2008 10:02:42 -0500
> Subject: Re: [HAM] B3 Swell Capacitor
> 
>> try switching out the 12bh7 and/or 12Ax7 for known good ones (i.e.
> non-microphonic). Check the shielded wire that connects the swell pedal
> (green wire) for a good connection. Also,  the swell cap housing
> there are four screws that hold down the assembly- make sure these screws
> are screwed tight to the preamp chassis. 
>>   
> 
> pete
> 
>  
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