Maintained in 2022/6. It is an attractive mono power amplifier with a beautiful design and thick mid-low range. In particular, the meter lamp is fantastic, and the way it shines slightly at night is really captivating. It is a thick, rich sound unique to the heyday of analog, with strong extrusion. There is a scratch on the front corner on one side (Oikawa Tetsuji)
Maintenance information: 2022.6.7 maintained (S/N796: semiconductor with deteriorated characteristics (P-Tr, OP-AMP, Zener), resistor replacement. S/N797: Changeover switch disassembly contact cleaning (796 treatment at the same time) Relay contact cleaning, polishing, bias, etc. are all set to manufacturer specified values for both units. Distortion ratio minimization adjustment, actual measurements confirmed that the distortion at 20 to 20 kHz was 0.003% or less, the S/N ratio was 100 dB or more, the maximum output was 200 W or more, and 0.0018% or less at 1 kHz @8 Ω for both units. (All 12 power Tr (6 para) are exchanged to match the characteristics)
Accessories: copy of instruction manual, 4 terminal covers
Main specifications: mono power amplifier 200W/8Ω S/N ratio 120dB or more W310 x H188 x D462 mm 22 kg