[Boatanchors] Interesting SP-600 JX-11

[Richard Knoppow]

    I think the only version of the SP-600 that had a product 
detector was the JX-21. These are quite rare. They look like a 
standard SP-600. I think the thing in the picture is a home brew 
modification. Hammarlund made a very good sideband adaptor, the 
HC-10, which could be used on any receiver with an IF between 455 
and 500Khz. It was later built into some models but not the SP-600.
    BTW, I think the SP-600 is one of the best looking receivers 
ever made but the modified thing looks like it came out of the 
Bat Cave. Just ugly, IMO.

On 4/3/2022 12:11 PM, Dave Merrill wrote:
> The sideband adapter on the right looks neatly done, could it be 
> commercial?
> 
> On Sun, Apr 3, 2022, 12:54 PM Richard Knoppow 
> <1oldlens1 at ix.netcom.com <mailto:1oldlens1 at ix.netcom.com>> wrote:
> 
>          Keep in mind this is a modified receiver. The original
>     JX-11
>     was produced in 1951 to replace the JX-7, it is a standard
>     frequency range version and there are no significant changes to
>     it. The date makes this a rather early model.
>           There is a list of versions in the SP-600 Anthology but I
>     don't have a URL for it.
>          Its impossible to tell what has been done to this receiver
>     beyond the bizarre paint job. It appears to have extra knobs on
>     it. If its home built it may be the only example.
>          The suffix may indicate only a run to fill a contract
>     but in
>     some cases, such as the JX-17, it indicates a special model. The
>     17 was built for  use in diversity rigs and is similar to the
>     special version modified by Northern Radio.
>          There were altogether something like 50,000 SP-600's
>     built, I
>     think only the R-390 was made in larger quantities.
> 
> 
>     On 4/3/2022 10:15 AM, Dave Merrill wrote:
>      > We're many of these made?
>      >
>      > https://www.ebay.com/itm/353812204137
>     <https://www.ebay.com/itm/353812204137>
>      >
>      > Dave N9ZC
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>     -- 
>     Richard Knoppow
>     1oldlens1 at ix.netcom.com <mailto:1oldlens1 at ix.netcom.com>
>     WB6KBL
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL