Great topic.
My first two systems were MCS or Modular Component Systems back around 1974 or so. Don’t remember much about the model numbers but my second system had a MCS 3233 receiver, 33 WPC. Had MCS speakers, turntable, cassette deck, headphones. Also a Realistic 5-band EQ. Wired up with the included interconnects and upgraded 18-guage zip wire. System sounded great and this second system was put together around 1976. Totally enjoyed it but it did push me to move on to a high end system after that one. Mowed lawns and did odd jobs like land scaping and working in restaurants to finance my audio fix.