[Boatanchors] Interesting SP-600 JX-11

[manualman at juno.com]

The SP-600 JX- 21A had the SSB update circuitry including the addition of
a three position switch (LSB/USB/CW) on the front panel. The JX-21 was
the standard JX model. 
Besides the Hammarlund HC-10 "SSB-type Converter", Hammarlund made a
similar one for rack mounting called the SPC-10. This one included a
front panel meter.

Pete, wa2cwa
www.manualman.com

On Thu, 7 Apr 2022 17:34:57 -0700 Richard Knoppow
<1oldlens1 at ix.netcom.com> writes:
>     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.

 Richard Knoppow
> 1oldlens1 at ix.netcom.com
> WB6KBL