SONY TA-F55

Commentary

Focusing on how to utilize the cartridge, this pre-main amplifier is equipped with a 4-step cartridge load selector and simple & straight transmission.

Two positions of MM/MC can be adjusted by the cartridge load selector.

It uses a DC power amplifier system, and the power transistor is Hi-f, which was born from Sony's original semiconductor engineering._TTransistor is used.
Since this transistor has excellent high-speed response characteristics, dynamic distortion such as transient intermodulation distortion can be suppressed with a simple circuit, preventing the adverse effect on sound quality caused by the complication of the circuit.

The heat pipe system is used to dissipate heat. The heat pipe has a thermal conductivity several hundred times that of a copper rod. This eliminates the need to use lead wires to connect the transistor to the circuit board and prevents electromagnetic waves from being emitted from the lead wires.

A pulse power supply is used for the power supply section. The pulse power supply immediately turns 100 VAC into DC, preventing 50Hz/60Hz AC magnetic field, contributing to the non-fluxing of the amplifier. In addition, the voltage fluctuation corresponding to the change of the signal is suppressed, and the signal can be supplied directly electrically.
The TA-F55 uses a high-speed rectifier diode to provide a more stable power supply.

A dedicated FET buffer power supply is installed in the preamplifier section.

Simple and straight transmission is used to locate components at the shortest distance along the signal flow, preventing degradation of sound quality due to electrostatic coupling between wires and components.

Features include self-defeat tone control, two monitor and tape-copy switch, audio muting, low filter and loudness.

Oxygen-free copper wires are used for signal lines, and gold plated terminals are used for phono terminals.

Model Rating

Type	Stereo pre-main amplifier
Harmonic distortion factor (at effective output)	0.008% (20 Hz to 20 kHz)
Signal-to-noise ratio	Phono MM:90dB Phono MC:75dB
Power consumption	110W
External dimensions	Width 430x Height 80x Depth 320 mm
Weight	4.6kg