Its large volume knob contains a light that serves as an index line, changing from green to red when the protective system has silenced the amplifier (shutting off the power for a few seconds allows the circuits to reset). The TA-F555ES does not have loudness compensation. Other buttons select a fixed bass boost and a subsonic filter function. The tone controls can be bypassed with a nearby button. A cartridge load switch selects either moving-magnet (MM) or moving-coil (MC) amplification, with a choice of either 100 or 330 picofarads of capacitance for an MM cartridge and either 30 or 400 ohms of input resistance for an MC cartridge.
There is also a small knob that selects the recording output, including a tape-copy connection from deck 1 to deck 2. Along the lower edge of the front panel are the usual tone and balance controls, the speaker selector, and a headphone jack. Red lights below the buttons show which source is being channeled to the tape-recorder outputs. The inputs (phono, two tape decks, and three other high-level sources, including one identified as “CD”) are selected by pushbuttons that have illuminated indicators above them. A rocker switch in the rear selects operating modes for loads from 8 to 16 ohms or from 4 to 6 ohms, the latter for use with low-impedance speakers 'or pairs of speakers wired in parallel. Its circuits are direct-coupled from the high-level inputs to the speaker outputs, and protective circuits prevent damage to either the amplifier or the speakers from a malfunction or most forms of careless operation. According to Sony, the TA-F555ES is intended to meet the special demands imposed by digital Compact Discs, and to this end the amplifier is said to have 100 dB of channel separation at 100 Hz, a 120-dB dynamic range, and a “linear gain control.” The TA-F555ES is rated to deliver 100 watts per channel into 8-ohm loads from 20 to 20,000 Hz with no more than 0.004 per cent total harmonic distortion and into 4-ohm loads with no more than 0.01 per cent distortion.
A front-panel inscription further identifies ACT as “a current drive amplifier system that has electrically separated the four amplifier sections for total elimination of mutual interference.” Elsewhere we are told that this involves the use of completely separate power supplies for each of the preamplifier and power-amplifier sections. Sony’s TA-F555ES integrated amplifier features what its manufacturer callsan “Audio Current Transfer” system (ACT).
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