[AMRadio] receiver survey

Peter Markavage manualman at juno.com
Wed Sep 19 19:33:37 EDT 2007

Chuck Dachis's book, Radios by Hallicrafters, shows a picture of the
R-274D/FRR, on page 59. You can clearly see the plate marking on the
front. His claim is that the SX-73, R-274/FRR, and R-274D/FRR were
virtually the same receiver. No mention on any mechanical filters.
R-274A - SP-600-JX-1, and -JX-12
R-274B - SP-600-JX6, -JX-35
R-274C - SP-600-JX-14. -JX-26

Not difficult to find this info.

Pete, wa2cwa

On Wed, 19 Sep 2007 17:24:53 -0500 Geoff/W5OMR <ars.w5omr at gmail.com>
> Do you know, or have you done the research on the SX-73 / R-274 to 
> find 
> out what the A, B, C and D models represented?
> As Todd pointed out, the R-274 was the nomenclature for 'a' 
> receiver.  
> The SX-73 was one, and the SP-600 was the other.
> As near as I have been able to figure out, the R-274-C/FRR was the 
> SP-600.  I've never seen an 'A', or 'B', and I -have- a D.  Unless 
> they're counting the non-designated models as 'A' models.
> I'd simply like to find out more history on the contract.
> > Mine has been completely restored by Miltronix, and holds it's own 
> with an
> > R-390 (also restored by Miltronix).
> >   
> Bah... as long as the damn thing works, I really don't care -what- 
> it 
> looks like!
> I would *still* like to know where other SX-73 versions of the 
> R-274's are.
> -- 
> Driving your AM Rig without a scope, 
> is like driving your car at night, without headlights. (K4KYV)
> --
> 73 = Best Regards,
> -Geoff/W5OMR

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