[Johnson] BA transformer replacements

[gbrown]

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" <altdx@worldnet.att.net>
To: <johnson@mailman.qth.net>
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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