Thanks, Tim for the link. You'll notice not only a JVC 4-DD5 at the right, but a Panasonic "demogitator" as well. Panasonic owned a majority stake in JVC at the time. I believe they still do.
As to more black boxes, I'll pass. My main system already has eight "black boxes." Hell, my black boxes have black boxes.
For you anal folks like me, here's the list:
Sylvania DQ-3700 (JVC 4-DD5)
Sony SQD-2020 full logic SQ/RM
Sansui QRX-5500 (used as QS decoder and Quad synthesizer ONLY)
Panasonic SH-3433 Quad scope
dbx 224 n/r encode/decode
Ortofon MCA-76 moving coil pre-preamp
Zektor HDS-4.1 switch
Russound QT-1 switch