[HAM] B3 Swell Capacitor

[Ted Thompson]

There are screws inside that hold the laminations of the transformer, if
they are loose the transformer will become microphonic.  You may need to get
in there and tighten the screws.  I've seen them come loose, even on home
kept organs.

Cheers!

Ted Thompson
General Manager - Speakeasy Vintage Music

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> -----Original Message-----
> From: hammond-bounces at zeni.net 
> [mailto:hammond-bounces at zeni.net] On Behalf Of Jordan Kersten
> Sent: Monday, February 11, 2008 10:22 AM
> To: The Hammond Forum
> Subject: Re: [HAM] B3 Swell Capacitor
> 
> 
> 
> 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
> > 
> >  
> > 
> > No virus found in this outgoing message.
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> > 2/11/2008
> > 8:16 AM
> >  
> > 
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