[Boatanchors] RE: [Milsurplus] TMC GPR-90 - info request

[WF2U]

My observation exactly.

Using the same antenna, switching between receiver "A" (GPR-90) and receiver
"B" (SP-600 JX-17) there is nothing "B" hears that "A" doesn't hear, about
the same signal strength.
Last time they were on my workbench for alignment/spec check (about 5 years
ago) their sensitivity figures were identical.

Indeed the GPR-90 is more stable after warm-up on the high bands. One thing
I noticed is that the GPR-90 bandswitch has to be cleaned once in a while,
it has the tendency to gunk up a bit.
The main advantage of the GPR-90 over the SP-600 is the band spread dial. I
also have the GSB-1 sideband converter and the original desktop speaker for
the GPR-90. This setup makes a hell of a nice looking  - and may I add -
performing classic receiver setup.
BTW I had the GSB-1 before I even got the GPR-90 and it was then connected
to the SP-600, with similar good results. Again, the lack of band spread in
the SP-600 makes it a little hairier to use it on the ham bands.

The GPR-90 is one of my favorite receivers in my collection...

73, Meir WF2U / NNN0AAF
Landrum, SC



> -----Original Message-----
> From: milsurplus-bounces at mailman.qth.net
> [mailto:milsurplus-bounces at mailman.qth.net]On Behalf Of Robert Nickels
> Sent: Tuesday, April 04, 2006 11:01 PM
> To: Glen Zook
> Cc: boatanchors at mailman.qth.net; Milsurplus at mailman.qth.net
> Subject: Re: [Boatanchors] RE: [Milsurplus] TMC GPR-90 - info request
>
>
> Glen Zook wrote:
> > After the GPR-90 warmed up for a little while, it
> > would run rings around both the the SP-600 JX-17s
> > where electrical stability was concerned, especially
> > above 10 MHz.
> >
> >
> Thanks for rising to the defense of the GPR-90, Glen!  I'll add my
> praise for this receiver, which I use almost every week.  I was
> fortunate enough to get one in virtually mint condition with the
> original speaker, and it sounds every bit as good as it looks (which is
> fantastic).  Mine doesn't drift noticably, on 75 meters where I normally
> use it, tuning is smooth and the receiver just has a high class feel to
> it.  I was able to find the matching GSB-1 sideband adapter which turns
> it into a decent SSB receiver - with hi-fi audio.  My only complaint
> would be the bandwidth is a little broad when QRM is strong, but I
> figure that's what Collins receivers are for ;-)
>
> I paired the GPR-90 up with the B&W 5100B and 51SB-B sideband adapter
> which are contemporaries from the late 50's and I liked the notion of
> the dual external sideband adapters - sort of a transition era thing ;-)
>
> 73, Bob W9RAN
>
>