[Amps] Re: SB-220 on 220V

[Michael Tope]

I agree with Dave. I recently wired an SB-221 for
240V service. It was wired exactly as Dave
describes (third wire is chassis to AC
mains safety ground connection). There is no
connection between the amplifier and the AC
mains neutral.

73 de Mike, W4EF.....................................................

----- Original Message -----
From: "Dave Haupt" <emailw8nf at yahoo.com>
To: <amps at contesting.com>
Sent: Friday, December 05, 2003 8:27 PM
Subject: [Amps] Re: SB-220 on 220V


> I do not think that is correct.
>
> My SB-220 does not use the neutral.  It uses
> hot-ground-hot in the power cord.   The "third" wire
> is connected to the chassis, and goes to the AC line's
> ground, not the neutral.  The schematic supplied with
> mine clearly defines the third wire as "ground" and
> does not refer to "neutral" at all.  Nothing on the
> primary side of the wiring is connected to the
> chassis.
>
> The 120VAC fan is driven from one of the primary
> windings of the power transformer when it is wired for
> 220VAC - essentially a center-tap.  The "third" wire
> is not used for carrying any current, except fault
> current.
>
> If you ran the neutral wire into an SB-220, I am not
> even sure where you would connect it.
>
> 73,
>
> Dave W8NF
>
> >From: Ku4uk at aol.com
> >To: amps at contesting.com
> >Cc: Ku4uk at aol.com
> >Subject: [Amps] RE 220 V
>
> >No one has said anything about the heathkit SB 22O
> wiring. It has two
> >hot
> >wires to transformer and neutral to chassis .
> >Thousands of them still in
> use.
> >Haven't heard of a problem with them. Maybe Richard
> can comment on this
> >here on
> Amps.
>
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