Most everything was sold in a rack system. Sanyo Fisher did not require a full dealership in order to sell the rack systems, part of the reason why so many retailers took then on. It worked out good for them. They became the largest seller of rack systems for a number of years. The rack system with the 800 in it was 799 I believe. Turntable, speakers, double cassette, tuner, turntable, and the amp. The only single pieces we were carrying, at the time, were some cheap $100 pr. speakers, which were garbage, and a turntable, don't remember the number, but it was CEC built I think, and not half bad. Believe it was around 139 w/o cart.
The rack systems started at 399, for a 30 wpc amp, tuner, double cassette, turntable, speakers, and rack. The only piece with a power supply was the amp and the turntable. Everything else plugged into the amp for power. Your piece looks similar to the amp in the 499 or 599 rack but of course, that was decades ago. I do remember a lot of the amps coming in with blown output fuses. It was so common that we would check them at the counter before writing them up for service and replace right then if necessary. So obviously many of these were being run pretty hard.
People who bought single pieces of gear were willing to pay the price to get Yamaha or Luxman, the next two lines up the ladder, that we sold. We also sold a pile of B&O turntables.