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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