This is a monster amplifier, very large and heavy, due to oversized power supply (that's a good thing!)
SX-D5000 Receiver — The D5000 is a large heavy box, 21 inches across and 39 pounds. It has controls grouped into three areas, the tone area on the left, control area in the center, and the tuning area on the right. The tone area includes speaker A/B, low pass filter, mono, treble, bass, and on-off. The control area includes buttons for FM, AM, AUX, phono, two tape monitors, an adapter loop, 1 to 2 and 2 to 1 dubbing, loudness, mute, and concentric volume and balance controls. The tuning area includes buttons for six pre-sets, down tuning, up tuning, memory, auto tuning, 25 microsecond FM de-emphasis, and FM muting. The D5000 has the non-switching amplifier rated at 80 watts per channel with less than 0.005% distortion. The SX-D5000 was available in 1980 and 1981,