Perseverance works
Carl
KM1H
----- Original Message -----
From: <Gudguyham@aol.com>
To: <amps@contesting.com>
Sent: Tuesday, September 16, 2008 6:35 PM
Subject: [Amps] SB-220 PROBLEM (FINAL)
>
> Latest diagnostic info........Disconnected one leg of the secondary AC
> side
> of the transformer going to center junction of the 8 caps in the
> doubler.
> Tried it again, and the plate meter still moved and the grid meter
> went
> negative, however it took more ac mains voltage to produce a
> significant movement on
> the meter. Next I disconnected the other AC lead going to the diodes
> so
> that the secondary of the transformer was totally out of the
> circuit.....now the
> meter does not move at all with full main voltage. Looks like there
> is
> leakage on the power transformer to ground, I took a measurement
> across the plate
> meter as it was moving and its only millivolts, but enough to cause
> the
> problem. Suffice to say the power transformer is leaking. Guess
> we'll need
> another transformer. This amp is one of the first made so the thing
> is pretty
> old. Time to lay to rest. Lou
>
>
>
>
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