Sony TA-F55

Sixty-five watts a side, a phono stage that handles both moving-magnet and moving-coil cartridges, and a chassis slim enough to slide under a tuner. That was Sony's "inseparable separates" pitch, and the hardware mostly backed it up.

Overview

Sony built the TA-F55 as half of a matched pair. It's an integrated amplifier meant to sit alongside a slim matching tuner, and together they take up roughly the footprint of a single receiver. That was the whole sales argument, and Sony leaned on it hard. The company's own advertising billed the combination as giving "the compactness of a single receiver, with the higher-fi engineering" of separate components, and pushed the point that the amp was a genuine step up from a one-box unit rather than a sideways move. High-Fidelity (September 1980, p.47) carried the same pitch, noting that the slim separates were positioned to deliver single-receiver convenience without the compromises.

The service documentation shows Sony didn't skimp on the electrical side to hit that low profile. The power amplifier section is rated at 2 x 65 W (RMS), specified into 8 to 12 ohms, with total harmonic distortion held under 0.01% across the full 20 Hz to 20 kHz band with both channels driven at once. That both-channels condition is the honest way to rate an amp. 65 watts at that distortion figure is respectable for a component this size. It's enough to drive most reasonable bookshelf and floorstanding speakers of the period without strain, though it won't tame genuinely inefficient loads.

The distortion story goes further than the headline figure. The manual specifies distortion below 0.008% at rated output and below 0.006% at 35 W, which suggests the amp runs comfortably within its limits at normal listening levels instead of being pushed toward clipping. Power bandwidth is quoted at 5 Hz to 30,000 Hz at 35 W output with 0.008% THD into 8 ohms. That's a wide, clean window for an output stage that doesn't only look good at 1 kHz.

The preamp section is where the TA-F55 earns a lot of its keep. The phono input is switchable between moving-magnet and moving-coil, with the MM input rated at 2.5 mV sensitivity and the MC input a genuinely low 0.17 mV. The RIAA equalization is held to within ±0.2 dB, and the signal-to-noise figures are strong: 75 dB on the MM input and 104 dB on the MC input, both A-weighted. The MC number is the one to note. A quiet moving-coil stage in a modest integrated amp was not a given in this era. HiFI-Stereo (December 1980, p.25) made a point of the TA-F55's phono flexibility, suggesting listeners with either MM or MC cartridges would find the amp accommodating.

Tone controls cover both ends of the spectrum. Bass shelving is +10 dB at 100 Hz with a 500 Hz corner, and treble is +10 dB at 25 kHz with a 5 kHz corner. There's also a subsonic filter rolling off at 6 dB per octave below 15 Hz. A loudness contour boosts +10 dB at 100 Hz and +3 dB at 10 kHz. The inputs are phono, tuner, two tape loops and an aux/TV input, with a tape-copy function for dubbing between decks. That's the usual full complement for this class. Source switching goes through a semiconductor switch array built around a CX 770 IC rather than mechanical contacts alone.

The physical package is compact: roughly 430 x 80 x 320 mm and about 4.6 kg net. The 80 mm height is the point, since that's what lets it stack neatly with its matching tuner. Power consumption is listed at 280 W. Build details called out in the period copy include gold-plated phono jacks, oxygen-free copper wiring, and metallized film resistors. HiFI-Stereo (September 1980, p.39) and High-Fidelity (September 1980, p.47) both highlighted these as the "final touches" distinguishing the model from cheaper slimline fare.

The documentation doesn't settle the production run. No start or end years are confirmed, and no original list price appears in the material available. Collectors hunting one should verify the exact variant, since the service manual notes different component values for AEP/UK and US versions in several positions, including the main filter capacitor and the cartridge-loading switch. The cartridge load switch offers a 330 pF setting, which matters for matching a phono cartridge's capacitance.

Today the appeal is straightforward: a clean, low-distortion 65-watt integrated with a capable dual MM/MC phono stage, in a package that won't dominate a shelf. The slim form factor that was a sales pitch in 1980 makes it practical now. The caveats are the usual ones for a component of this age. The semiconductor switching and the electrolytics in the signal path are the first things to check on a unit that's been sitting, and the low-profile chassis leaves less room for airflow than a full-height amp, so ventilation matters.

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