![]() With this setting of the speaker impedance switch, the amplifier’s clipping headroom was 0.76 dB into 8 ohms and 2.28 dB into 4 ohms. The dynamic power output was 150 watts into 8 ohms, 258 watts into 4 ohms, and 142 watts into 2 ohms. The protective circuit shut down the amplifier at 169 watts with 4-ohm loads and at 36 watts when we attempted to drive 2-ohm loads. Using the 8- to 16-ohm setting of the speaker impedance switch, we measured a clipping-power output at 1,000 Hz of 119 watts per channel into 8 ohms. The one-hour preconditioning at one-third power made the top of the case quite hot, but it never became unduly warm in normal use. The TA-F555ES seems to have one power supply, and the isolation implied in the spec sheet must come from individual voltage regulators supplying each section. Curious about its four “separate” power supplies, we removed the cover and found one power transformer (granted, a husky one) and the usual minimum of two filter capacitors. SONY TA F555ESX MANUALS ONLINE MANUALOur test sample of the Sony TA-F555ES (an early production unit) was supplied without an instruction manual or schematic. The all-black Sony TA-F555ES is 17 inches wide, 13-3/4 inches deep, and 5-1/8 inches high, and it weighs about 30 pounds. sockets (two of them switched) as well as the speaker impedance switch and the signal jacks (the phono jacks are gold plated). The rear apron contains heavy-duty speaker-output binding posts and four a.c. 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 TA F555ESX MANUALS ONLINE SOFTWAREDoston Agr Apko Meri Baat Pe Yaqeen Naa Aye Apko Main Neechy Aik Software Ki Link De Raha Hon Usko Download Kr K Video Ko Follow Krty Huwe Ap Khud Bhi Check Kr Sakty Hain Keh Increase Hota Hai Keh Nahin Haan Is Me USB Ya Card Ka Kharab Hony Ka Koi Risk Nahin Hai.Sony’s TA-F555ES integrated amplifier features what its manufacturer callsan “Audio Current Transfer” system (ACT). ![]()
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