Hand made Hobbyskoop Philips hi-fi amplifier. Sounds perfect. MM Phono input. Very clean excellent condition in and outside. Power supply is set to 60V Both Idle currents are set correct Contacts cleaned 2x40W Philips DIY amplifier This amplifier consists of the parts kits NL6924 power supply, NL6923 preamplifier, NL6920 stereo power amplifier. The device was housed in a wood panel and aluminum cabinet and was fitted with the original, matching Philips front panel (purchased separately), and stood on rubber feet. Distortion (dtot): between 50 and 10,000 Hz, less than 0.1% at 40 W. 2 x 40 watt HiFi/stereo power amplifier NL 6920 Intermodulation distortion: 0.25%, measured at 40 and 10,000 Hz in a ratio of 4:1 and at 40 W equivalent power. Noise level: 100 dB relative to 40 W (with short-circuited input). HiFi/stereo power amplifier fully equipped with silicon transistors, featuring high continuous output power with very low distortion. The driver and output transistors are types specially developed for HiFi purposes. The amplifier is protected against overload and short circuits of the loudspeaker outputs. Preferably to be used with the HiFi/stereo preamplifier NL 6923 and the stabilized power supply unit NL 6924. Input voltage: 400 mV for 40 W output power. power. Input impedance: 100,000 Ω. Output impedance: approx. 0.08 Ω. Load impedance: at least 8 Ω. Damping factor: approx. 110. Supply voltage: 60 V. Current consumption: peak 2.2 A, average approx. 500 mA, quiescent current approx. 120 mA. Dimensions: approx. 193 x 72 x 42 mm. Dimensions heatsink with output transistors: approx. 190 x 85 x 20 mm. Technical specifications Output power: 2 x 40 W continuous (8 Ω). Power bandwidth: 10... 20,000 Hz at 1% distortion and at least 40 W. Montalux enclosure ready for installation of the combination NL 6920, NL 6923, NL 6924. Frequency range: measured at -6 dB relative to 40 W: 10... 60,000 Hz (-0.5 dB); lower than 10 Hz... higher than 100,000 Hz (-3 dB). 2 Speaker din plugs and RCA cables included. Carefully shipped