Service/repair manuals owners/users manuals
Also, the power switch is on the back of the unit and when it is on you can still turn the unit on and off by touching the Bose logo on the front of the unit.
It puts out 100 watts per channel and has a built in EQ for the Bose 901 series IV speakers.
Sansui 9900 eBay
Bose also made a model 550 that had a built in EQ as well but only sported 40 watts per channel and had no spatial control.
Tuner Information Center - Sansui Tuners
The front of the receiver has a flip down panel to access the controls.
Sansui 9900 user manual:
Rating: 100 / 100
Overall: 97 Rates