[R-390] 390() vs 390(A) vs 389

[Sandy Geiger]

   Surely  you  jest,  Mr.  Bond....  I think an easier thing would be to
   change  the  stripes  on  a tiger...I don't think anything major would
   interchange  w/a  R-390A. Now, a few things would w/an R-390...but not
   the  "A"  model. I suppose it COULD be done, but why? Kinda like going
   to McDonalds & ordrering a cheeseburger w/o cheese...<grin>-Sandy G.
   >From: eldim at att.net
   >To: paul at pdq.com, Barry Hauser <barry at hausernet.com>
   >CC: r-390 at mailman.qth.net
   >Subject: Re: [R-390] 390() vs 390(A) vs 389
   >Date: Tue, 28 Dec 2004 05:21:20 +0000
   >
   >Hello Fellow Collectors, Operators, and Maintainers,
   >Just  thought  I'd  throw  this  out  for your comments, suggestions,
   etc.  Since there is so little activity on the LF/VLF bands and my 389
   has  not  been getting much exercise, I was wondering how much rework,
   modification,  etc to bring it onto the HF Band?  Has anyone attempted
   this challenge?   In other words upgrade it to a R-390A.  Hope everone
   had  a  wonderful  Christmas,  and a restful holiday. May the New Year
   bring each of you PEACE and PROSPERITY.
   >
   >73,
   >Glen Galati,  KA7BOJ
   >Tacoma, WA
   >eldim at att.net
   >
   >--------------    Original    message   from   "Paul   H.   Anderson"
   <paul at pdq.com>: --------------
   >
   >
   > > On Sun, 26 Dec 2004, Barry Hauser wrote:
   > >
   > > > Hi John & list
   > > >
   > > > There is also the R-391, which is basically the same as an R-390
   with an
   >  >  >  electromechanical autotune mechanism added. There is an extra
   8-channel
   >  >  > knob, little window showing the current channel and special MC
   and KC
   > > > knobs with locking keys.
   > >
   >  >  Don't  forget  the  R-389, which is about as much alike as it is
   different.
   >  >  The  frame is very similar to the R-390 frame (maybe the same, I
   haven't
   >  >  looked real closely yet), and uses the same IF, AF and PS. Early
   R-389's
   > > used a PS with different output B+ wiring. Supposedly these were
   >  >  retrofitted  so that PS's were compatible across the R-389/R-390
   and R-391
   > > (MOD-1, I think).
   > >
   > > The VFO and RF decks of the R-389 are very different, and there is
   a
   >  >  rectifier  stack  for  producing  DC for the R-389 tuning motor.
   Oddly, the
   >  >  R-391,  which  also  has a DC motor for tuning, doesn't have the
   rectifier
   > > stack. There probably wasn't room, if I had to guess.
   > >
   > > Paul
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