Sharp Optonica SM-4646

Specs

2x60W@8Ω/20-20000Hz,

2x85W@4Ω/20-20000Hz,

2 Optonica RH-iX1056AF power(pack) transistors,

2x(2x6800)µF Nichicon (dual-C) caps,

3 power transformers,
32 steps volume pot,

mm 442x144x363 mm, kg 16,0.

Philips RH 720

Specs

4 band tuning,

FM preset touch sensor, AFC,

2x30W@4Ω,
Philips components,

mm 540x117x280, kg 14,0. 

RFT Ziphona HSV 921

Specs

2x25W@4Ω/30-20000Hz,

2200/4700µF Frolyt caps,

dual core power transformer,

5-pin DIN 41524 source in/out,
DIN 41529 speakers out,

mm 418x90x336, kg 7,5.