[Boatanchors] GPR-90 Vs R-390A

[wf2u at ws19ops.com]

The GPR-90 has a different "architecture" conversion-wise than the  
Collins-type conversion receivers (first IF variable, after crystal  
conversion, and fixed second IF). Stability and frequency readout  
accuracy is better with the Collins-type receivers. The main down side  
of most Collins receivers is the somewhat anemic and tinny-sounding  
audio. The SP-600 and GPR-90 sound much better and less fatiguing.  
Just an interesting fact is that the Russians made a series of  
receivers starting in 1949, using the Collins system. I have an early  
50's version (R-250M), all octal tubes and it's the best octal tubed  
receiver I ever used!
Its performance is better than the Collins 51J4 - the audio is better as well.
It weighs about double the R-390 and it's larger...
I look at the GPR as a funkier looking SP-600 with band spread.From  
comparing my SP-600 with my GPR-90 two side by side, they're about the  
same, with the GPR-90 easier to tune on the ham bands. Interestingly,  
I got my GSB-1 sideband/CW adaptor before the GPR-90 and I used it for  
a while with the SP-600. I found the two receivers about equal in  
performance even with the GSB-1.

73, Meir WF2U
Landrum, SC


Quoting Harold Hairston <k4hca at windstream.net>:

> There were many Boat Anchors at the Shelby/Dallas, N.C. Hamfest this  
>  past weeknd. I saw a very nice GPR-90, first one in many years.  
> Just  wondered, from those who know, how do these two receivers  
> compare?
>
> Harold
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