PIONEER Integrated amplifier A-717 Stereo transistor working AC100V Black USED

Description


This pre-main amplifier was developed as the culmination of a fundamental review of the circuitry, construction, physical properties, and other aspects of an amplifier in order to accommodate digital sources. The design concept of this amplifier is summarized in three major points. The first is "proper placement of each signal block to minimize signal paths. Second, "Thorough measures for vibration isolation and non-resonance. The third is "improvement of speaker drive capability at low loads. We have solved various problems by applying a variety of technologies to the above. The phono equalizer can be turned off when not listening to records, preventing unnecessary noise generation. The equalizer section employs a unique NF-CR type circuit to stabilize operation in the mid and high frequency range, and low noise Hi-gm FETs are used to improve S/N. The recording selector also has an OFF function. The recording selector also has an OFF function, and the purity of the sound is enhanced by using a simple circuit configuration. Copper-plated parts are used on the rear panel and bottom plate to prevent electromagnetic distortion and vibration.