Stereo Power Amplifier (1973)
Power output: 250 watts per channel into 8Ω (stereo)
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 0.05%
Damping factor: 400
Input sensitivity: 2.25V
Signal to noise ratio: 106dB
Dimensions: 16-3/4 x 6-3/4 x 17-1/8 inches
Finish: brushed gold anodize and black enamel
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Reviewed Feb 14th, 2014 by zaphod1000
The Model 500 was a revelation to me and the rest of the audio industry. Capable of brutish amounts of power (far more powerful sounding than the Japanese receivers, like the 2500 and 2600) and far, far better sounding than the horrible 510/M which succeeded it. A big, ballsy, but highly detailed amp, the Model 500 is a credit to it's designers. It is an enormously complicated amp, very difficult to service, but rewarding to listen to.
The Model 500 was my first big power amp. I acquired it in 1976. At that time, only 3 units had entered Australia. They were phenomenally unreliable, but, arguably, the best power amp built in the early 1970s. I cannot part with mine. I still own it, but I haven't used it in more than 30 years.