[Johnson] BA transformer replacements

Mon, 04 Feb 2002 21:21:43 -0500

Dear Gary,

Hope your "ticker" is doing better!!! Stress (that comes with hard work) will do
it...
Be sure to follow your doctor's orders...

I've got a 2nd 516F-2 that may need a rewind on the power xfmr. A friend of mine

thinks the xfmr is "saturating"...It may be.....Hell, it's 40 years old.....

I just got through rebuilding the 2nd one, and it seems to work fine.

73,

John

gbrown wrote:

> Hi John:
>     Well..Well..Well.., your still alive and kicking. Havnt heard you on
> here in awhile. Just a thought, I am rewinding transformers and just did one
> for a 516F-2 for a Collins collector. He said when he got it back that it
> was rite on the money as far as voltages were concerned and it was the
> quitest one he ever heard running. At first he thought it wasnt working,
> hehehehehehe. Just to let you know, I am around 25% to 30% below Peter Dahls
> prices. Warantee for a year and turn around time rite now is three weeks.
> Keeping busy with these rewinds. Im not on the road anymore because of
> stress and a mild heart attack.
>
> Regards
> Gary...WZ1M
>
> http://Tubes_Tubes_Tubes.tripod.com/tubestubestubes/index.html
>
> http://Tubes_Tubes_Tubes.tripod.com/
>
> ----- Original Message -----
> From: "Dr. John Harden" <[email protected]>
> To: <[email protected]>
> Sent: Monday, February 04, 2002 3:20 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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> >
> >
> >
>
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