The integrated amplifier is a powerful 80 Watts RMS per channel equipment. The power supply is some kind of early switching type, but different from current designs. It has low distortion, MC and MM preamp for phono cartridge and a very clean sound. It has a curious feature: a "listening level monitor" slider to set the LED power threshold. This well replaces level indicators, which might have been very expensive in the past.I am looking for the service manual for this amplifier.
This receiver is an early digital type, mixed with an analog tuner. It uses the standard 3-gang air type variable capacitor and a special type of "Quartz Lock" system, which locks the FM station frequency after the tuning center has been found and the dial movement has stopped. It has a clean 50 W RMS per channel audio power. Total harmonic distortion is better than 0.05%. The tuner performance is very good (and much better after some little mods): clean reception of well far stations (200 km permanent and 350 km and beyond ocassionally with a 5 element yagi), improved high selectivity (at least 75 dB instead of the 50 dB claimed on the manual), thanks to a third ceramic filter inserted to the IF circuitry. Finally, an added switchable hi-blend function using the subsonic filter button. The subsonic filter was permanently activated. I had to replace also the muting resistor by a trimming potentiometer and a smaller series resistor, because some local stations were overmodulated enough to produce instant muting and stereo LED flickering during the early 80's. Fortunately, broadcsters learned to do better quality transmissions over the years and this problem does not occur anymore.
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