Yamaha M-65 . This amp sold for almost a $1,000 new. It is perfect in every way. Has gold connections and the Specs: 170 true watts per channel 195 watts at 6 ohms, 230 watts at 4 ohms Auto class A operating range. Red leds to show your channels or you can turn them off. Will operate a & b speakers. This amp has connections and switching capability for three pairs (six single) speakers. User can select speaker impedence betwenn 2,4, and 8-Ohms. This unit is from the mid 1980s. Freguency response 20 to 20,000 Signal to noise 127db THD .0002% Channel seperation 89db 17 ' w x 6.5 h x 16.75 d Weighs about 40lbs. Buyer pays UPS shipping. Pay by PayPal, BidPay or Postal Money Order.