[Johnson] BA transformer replacements

Rick Gouge VER7RiK [email protected]
Tue, 5 Feb 2002 18:10:47 -0800


Ok John , I will see what i can do for you. 73 for now. Rick VE7RiK
----- Original Message -----
From: "John W. Harden, Jr." <[email protected]>
To: <[email protected]>
Sent: Tuesday, February 05, 2002 4:58 PM
Subject: Re: [Johnson] BA transformer replacements


> Dear Rick,
>
> I need one so I'm prepared to pay!!!
>
> 73,
>
> John
>
> Rick Gouge VER7RiK wrote:
>
> > Hi John. No i don`t have one of those knobs kicking around here. But i
do
> > know a few people that might and i will see what i can do for you. What
is
> > it worth to you so i can offer a price if i find one?  Rick VE7RiK
> > ----- Original Message -----
> > From: "Dr. John Harden" <[email protected]>
> > To: <[email protected]>
> > Sent: Monday, February 04, 2002 6:27 PM
> > Subject: Re: [Johnson] BA transformer replacements
> >
> > > Hi, Rick!!!
> > >
> > > You wouldn't by chance have one of the small knobs that is used in the
> > KWM-2A
> > > to change the xtal board in use? It's located right above the band
> > switch...
> > >
> > > Thanks for info on bucking xfmr...
> > >
> > > 73,
> > >
> > > John, W4NU
> > >
> > >
> > > Rick Gouge VER7RiK wrote:
> > >
> > > > Hi John. Why not use a bucking transformer. i use one in line for
all of
> > my
> > > > tube gear. 20 amp filament transformer does the job. the line
voltage
> > works
> > > > out to be between 108 and 110 volts.   73 Rick VE7RiK
> > > > ----- Original Message -----
> > > > From: "Dr. John Harden" <[email protected]>
> > > > To: <[email protected]>
> > > > Sent: Monday, February 04, 2002 12:20 PM
> > > > Subject: [Johnson] BA transformer replacements
> > > >
> > > > > Whenever I have a transformer fail I look at a new one by Stancor,
> > etc.
> > > > > If  I can't find a replacement I use Peter Dahl. They are
expensive
> > but
> > > > > extremely dependable. Old transformers usually break down and I
avoid
> > > > > them.
> > > > >
> > > > > When the first Collins 516F-2 power supplies came out the primary
was
> > > > > only 108 VAC!!!! The primary voltage went up over the years as
Collins
> > > > > was aware of the increase in AC line voltages to 120 VAC or more.
> > > > >
> > > > > I recently restored a 516F-2 supply for use with my KWM-2A
> > transceiver.
> > > > > I use high-quality solid state replacements for the 5U4 and 5R4
that I
> > > > > purchased locally at Ack Radio Supply. Naturally I use a variac
> > > > > auto-transformer to set the AC. With only
> > > > > 103 VAC on the primary I get the rated 285 VDC and the 800 VDC out
of
> > > > > the supply key up.....Imagine where it would be with 120 VAC or
more
> > on
> > > > > the primary!!!! Old transformers will quickly break down if the
input
> > AC
> > > > > is too high...
> > > > >
> > > > > 73,
> > > > >
> > > > > John, W4NU
> > > > > Atlanta
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
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