Proton AM-452

Specs
2x25W@8Ω/20-20000Hz,

2x2 Sanken A1186 C2837 power transistors,
4x2200µF Panasonic filter caps,
Panasonic SU components,

pre out,

phono mm,

mm 446x80x332, kg 6.

Proton AM-455PRO

Specs
2x50W@8Ω/20-20000Hz,

2x2 Toshiba 2SD424 2SB554 power transistors,
4x10000µF Nichicon filter caps,
Wima, Nichicon Muse, Panasonic components,

toroidal power transformer,
pre out,

phono mm.

mm 446x80x332, kg 9.

Proton AM-452PRO

Specs
2x25W@8Ω/20-20000Hz, 

2x2 Toshiba 2SD424 2SB554 power transistors,
4x4700µF Panasonic filter caps,
Wima, Nichicon Muse, Panasonic components,

toroidal power transformer,
pre out,

phono mm.

mm 446x80x332, kg 7.