[R-390] R390A / R390 help

Thu, 24 Jan 2002 08:00:29 -0500

Hi Lee:

In terms of sensitivity, individual units will vary more according to
condition and precision of alignment than the specs between the non-A and A,
which are close if not eqivalent on paper.  The bigger difference has to do
with the IF section where the non-A has L/C filtering vs. the mechanical
filters of the R-390A.  The non-A is smoother, the A is steeper and with
some ringing from time to time.  There are a lot of other differences -- the
non-A has a heavier gear train, full-sized internal BNC connectors, more
elaborate (and hotter) power supply, was produced in smaller numbers, etc.
There are sites on the 'net that compare 'em.

As for the front panel.  You can probably get one from Fair Radio, but the
first question is -- what's behind those added switches?  The mod may be
desireable or not.  Sounds like someone put in a product detector or perhaps
the diode mod and made it switchable or whatever.  Or it could signify that
the IF module was badly hacked on.  If the mod isn't worthwhile, you could
fill the extra holes with plastic aluminum or similar in the process of
refinishing the panel.  But I think you should check out the inside aspect
of those added switches before buying.  The holes are no big deal.

Barry

----- Original Message -----
From: "Leroy Ritta" <[email protected]>
To: <[email protected]>
Sent: Thursday, January 24, 2002 7:35 AM
Subject: [R-390] R390A / R390 help

>
>
> Hello Everyone,
> I have a question, how does the R390 and R390A compare as to sensitivity?
> Anyone with a spare front panel for the R390 I am looking a buying one but
> it has been modified they have added 2 extra switches  am and ssb on both.
> Its a Motorola s/n 4170 I will need to restore the front panel it needs a
> paint job.
>
> 73's Lee.
>
>
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