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Re: [Amps] SB-220 and Copious Amounts of Smoke...

To: <amps@hidden-valley.com>, <amps@contesting.com>
Subject: Re: [Amps] SB-220 and Copious Amounts of Smoke...
From: "Fern Rivard" <crc@cyberlink.bc.ca>
Date: Wed, 4 Feb 2009 11:10:58 -0700
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Jeff: It sound like transformer windings are  shorted out. This was a fairly 
common problem with this happening to that transformer.  Fern


----- Original Message ----- 
From: "Jeff Carter" <amps@hidden-valley.com>
To: <amps@contesting.com>
Sent: Tuesday, February 03, 2009 10:28 PM
Subject: [Amps] SB-220 and Copious Amounts of Smoke...


Hi all,

The SB-220 I've been rebuilding has developed a problem.

I put brand new tubes in it, and when I fired it up, within ten
minutes the filament transformer began *smoking*.

I thought maybe some of the wiring or components were burned, but an
inspection didn't reveal any.  I removed the side panel and put power
back on the amp, and sure enough, the smoke is coming from the
transformer itself.

I can't find a problem in the wiring.  Of course, it doesn't do this
this with the tubes removed, it'll merrily sit there all day with no
tubes.

Ideas?  What have I done wrong?

Thanks,
Jeff/KD4RBG
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