[R-390] R-390A Product Detector Schematic available

[Tisha Hayes]

Les,
Was that the detector design based upon the W1KLK "Updating the SP-600"
article from August 1970 QST?

I have another schematic that would have required about seven different
interconnects to the SP-600 to add a product detector and SSB to the SP-600.
That was something I was working on when I compared the differences between
the SP-600 variants and was looking at making a plug in module to add
functionality. It has a 12AU7 as a product detector and a 12AT7 as a carrier
oscillator.

-- 
Ms. Tisha Hayes/ AA4HA
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"your parent tree stifled your theme desire and gave rise to your desire to
dwark someone in a blendish manner" -- X Minus One, Bad Medicine