NAKAMICHI 620 + 630 - made in Japan Nakamichi 620 Power amplifier : Power output: 100 watts per channel into 8Ω (stereo) Dimensions: 400 x 189 x 248mm Weight: 12.5kg The 620 is closer to a pure class B amplifier than anything else that has gone before. The first stage of the 620 is a differential amplifier with "current mirror" loading. The final section of the amplifier is a four stage push-pull circuit. All four stages are full complementary direct coupled, and each stage employs a unique double NPN/PNP combination for the positive and negative halves. This design eliminates the errors inherent in even the most carefully matched pairs of NPN/PNP output devices. Nakamichi 630 FM Tuner preamplifier : Dimensions: 400 x 170 x 237mm Weight: 7kg Both items are tested and working : A-ZGF269671 Pictures are part of description. Shipping by DHL.