Vintage Tube Amp

Item: Rare Vintage 1970s Heathkit Model AA-1506 Power Amplifier. Briefly plugged in unit and I didn’t not see any indication of power. Please ask any questions/ address any concerns prior to purchasing. Heath Schlumberger Scientific Instruments; Benton Harbor, Michigan. United States of America (USA). Audio Amplifier or -mixer. Power type and voltage. Alternating Current supply (AC) / 120 or 240 Volt. This model requires external speaker(s). Model: Power Amplifier AA-1506 – Heath Schlumberger Scientific. 203 x 143 x 373 mm / 8 x 5.6 x 14.7 inch. Heathkit Power Amplifier AA-1506. High quality stereo power amplifier, input jacks with level controls on the back. 2 x 60 watts continuous power according to RMS (20-20,000 Hz) at 8O. Frequency response 8 to 45,000 Hz + 0 / -0.5 dB. 0.1% (20-20,000 Hz) at 0.25 to 60 watts. Damping factor at least 60. Two pairs of speakers can be switched. Net weight (2.2 lb = 1 kg). 7.8 kg / 17 lb 2.9 oz (17.181 lb).