Kenwood Model 600 (Supreme Series)

Specs

dual mono,

130Wx2@8Ω/20-20000Hz,

4x2 Sanken 2SC1116A 2SA747A power transistors,

4x18000µF Elna filter caps,
44 steps Alps volume pot,

mm 440x154x388, kg 21,3.

Kenwood Model 500 (Supreme Series)

Specs

dual mono,

2x100W@8Ω/20-20000Hz.

4x2 Sanken 2SC1116A 2SA747A power transistors,

4x15000µF Elna filter caps,
44 steps Alps volume pot,

mm 440x154x388, kg 20,2.

Onkyo A-7090

Specs

dual mono,

110Wpc@8Ω/20-20000Hz,
4x2 Toshiba 2SD551 2SB681 power transistors,

4x15000µF Nichicon filter caps, 
Marcon, Sanyo, Nippon Chemicon, Nichicon, Panasonic components,
32 steps volume pot,
dual power transformers,
phono mm/mc,
mm 420x160x410, kg 18.