I would guess there was a failure somewhere in the transformer...Lead wire
broken or un-soldered or something of the sort....
Just a guess....
Had to "repair" the filament transformer in an Ameritron AL-1500 once. One
of the high current (filament) secondary wires had a bad connection where
the lead wire soldered onto the end of the winding.....It was not potted
73 and cul
From: Len Schaier <email@example.com>
To: firstname.lastname@example.org <email@example.com>
Date: Thursday, February 18, 1999 3:06 PM
Subject: [AMPS] SB220 Xformer labodomy
>I have a very noisy SB220 power transformer that sounds like a bad
>florescent ballast. Other than being noisy, the amp works fine. I've taken
>good look at the transfomer and noticed that the back surface of the
>tranformer has been hacked off. It looks like someone was trying to make
>more clearance between the transformer and the back plate of the amp but I
>doubt that that is the reason for cutting the transformer. I removed the
>back plate and pushed asside the paper insulator on the windings and
>that there is some grey tape ( looks suspicially like duck tape) wrapped
>around the windings.
>I'm tempted to just loosen the screws, paint the laminations with some
>shellac and see if I can get rid of the noise.
>Anybody ever hear of this kind of transformer surgery or why anybody would
>Thanks in advance.
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