[Johnson] Johnson 500 Power Supply?

[C E]

Perhaps a good approach would be to use the existing
chassis (after it has been taken down to "parade
rest") and sheath the top with a blank piece of sheet
metal and punch for the new components accordingly.
Ensure you have a fool proof design waiting to
populate the top of the bare chassis. 

Cal.
--- C E <catman351 at yahoo.com> wrote:

> Hi Roger:
> Since the unit has been butchered, the next best
> thing
> to do would be to rebuild it in the best design
> parameters possible. If there has been metal
> modifications, start from scratch and rebuild
> accordinginly. 
> 
> Best of luck to ya and Merry Xmas. Cal. 
> --- Roger Shultz <nj2r at earthlink.net> wrote:
> 
> > A local OM recently bought a 500 with power supply
> > missing the HV transformer. Well, the power supply
> > is far worse off than just missing the HV
> > transformer. From what I can see it only resembles
> > the original supply in that it still has its
> > handles! Hi!
> > 
> > The screen regulators have been removed, can
> > electrolytics have been mounted in their place,
> the
> > modulator seems to have been modified (disabled)
> to
> > accept an external audio source probably from some
> > sort of audio amplifier directly into the 811's
> and
> > the 3rd audio and audio driver removed in the RF
> > unit. The swinging choke in the power supply has
> > been replaced with a non-swinging 5 HY model. The
> LV
> > supply 10 HY choke has been replaced. The
> modulation
> > transformer has been replaced as well. There are
> > three undocumented pilot lamps on the chassis and
> a
> > 0n-off toggle switch. The HV arrangement with the
> 3
> > pin jacks is gone, Additionally there is an added
> > relay for some purpose and numerous undocumented
> > wiring changes. The chassis has lost much of its
> > plating and is rusty to boot.
> > 
> > IMHO, this could be considered a basket case
> though
> > it is probably an insult to baskets! 
> > 
> > At least the RF unit looks good from the outside
> and
> > if the power supply could be salvaged, even at
> > significant cost, it's a useful transmitter.
> > 
> > So, my questions for the list are:
> > 
> > 1. Were there different power supply versions?
> > 2. Do any of these changes appear to resemble
> > documented mods over the years?
> > 3. What are the odds of obtaining a non-messed
> with
> > power supply (do I hear screams of laughter?)? 
> > 4. If possible at what cost?
> > 
> > It appears the only way to resurrect this thing is
> > to carefully try and figure out the wiring and
> then
> > proceed from there to put it as close to original
> as
> > possible. Any thoughts guys?
> > 
> > And I thought KWS-1's were a pain in the neck!
> > 
> > 73, Roger, NJ2R
> > Johnson mailing list
> > Home:
> > http://mailman.qth.net/mailman/listinfo/johnson
> > Help: http://mailman.qth.net/mmfaq.html
> > Post: mailto:Johnson at mailman.qth.net
> > 
> 
> 
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