Sony TA 1630 (1975–1977)

At 6.7 kg, it sits in the rack like a compact workhorse - light enough for easy handling, dense enough to mean business.

Overview

The Sony TA-1630 is not a headline-grabbing powerhouse. It is a serious integrated amplifier from Sony's mid-70s engineering phase. Rated at 22 + 22 W RMS into 8Ω across 20Hz - 20kHz, it is modest by modern standards. The 25 + 25 W output at 1kHz suggests it could briefly handle dynamic peaks. Harmonic distortion stays under 0.5% at full rated output and drops to less than 0.1% at 1 W, which points to clean operation at typical listening levels. Intermodulation distortion is also held below 0.5%. Frequency response runs from 10 Hz to 40,000 Hz (IHF), well beyond the audible range, and line-level inputs hold a flat 20-100,000 Hz ±1 dB. The phono stage follows the RIAA curve to ±0.5 dB, which was tight for its era. Signal-to-noise ratio is 90 dB (A-weighted) on line inputs and 70 dB (B-weighted) on phono, with residual noise measured under 0.25 μW into 8Ω. A damping factor of 40 at 1 kHz hints at decent control over speaker loads, though not the iron grip of higher-end contemporaries. Input sensitivity is 200 mV for line and 2.5 mV for MM phono. Input impedance is 100 kΩ (line) and 50 kΩ (phono), so it works with most passive preamps and moving magnet cartridges. Output levels are standard: 200 mV at REC OUT 1, 30 mV at REC/PB. The amp takes 4-16 Ω speakers on AEP and Canadian models, while the UK version is limited to 8-16 Ω. That matters if you are sourcing replacement speakers. Power consumption varies by region - 210 W for AEP/E models, 150 W for UK, and 100 W for Canadian - reflecting different transformer configurations and line voltages (110-240 V AC, 50/60 Hz). Fuses range from 3.15 A to 4 AT depending on model, and a voltage selector plug is included on AEP/E/UK versions. The unit measures 388 mm wide, 286 mm deep, and 45 mm tall, which was compact by 1970s standards. It weighs 6.7 kg (14 lb) net, 8.5 kg (18 lb) shipping.

Key Features

Steel Lid with Wooden Side Cheeks

The TA-1630 has a steel top cover with wooden side panels. The side cheeks helped dampen vibrations and protect internal components, a common practice in mid-tier separates of the era.

FUNCTION Rotary Switch and Lever Slide Controls

Input selection is handled by a central FUNCTION rotary switch, offering PHONO, TUNER, AUX, TAPE 1, and TAPE 2. Tone adjustments are lever slide switches: LOUDNESS and PRESENCE flank the volume knob, while bass and treble controls give ±9 dB at 100 Hz and ±6.5 dB at 10 kHz respectively. The loudness contour applies a +8.8 dB boost at 50 Hz and +2.5 dB at 10 kHz when engaged at -30 dB attenuation, to compensate for low-volume listening. The presence control adds +2.5 dB at 1 kHz under the same attenuation, useful for vocal clarity.

Monitor and Tape Routing Options

A MONITOR lever slide switch routes TAPE 2 to the main output, so you can monitor tape without breaking the signal chain. The amplifier has TAPE 1 with REC OUT 1, a TAPE 2 input, and a REC/PB connector on AEP and UK models, which covers basic tape looping and dubbing. Pre-out and main-in jacks are not documented, which limits bi-amping or preamp upgrades.

Headphone and Speaker Compatibility

The front-panel HEADPHONES jack supports both low and high impedance models. The speaker terminals are sturdy, and the 4-16 Ω (or 8-16 Ω) range fits many vintage cabinets, though owners should verify impedance to avoid overloading the output stage.

Power Supply and Protection

Each regional variant includes a power transformer, and Canadian models also have an encapsulated component, possibly a filter or regulator. The DC bias is set to 25 mV, a critical adjustment for minimizing crossover distortion in the output stage. The POWER pushbutton switch comes with a neon lamp for on/off indication. Canadian models include switched and unswitched AC outlets rated at 200 W each, useful for powering a tuner or cassette deck.

Discrete Transistor Output Stage

The amplifier is a discrete transistor design with no integrated circuits, using parts like the 2SC1362, 2SA705, 2SA884, and 2SB521. Diodes include SV04F, 1T243, and 10E2. This discrete approach is service-intensive today, but it was standard for reliable performance in the 1970s. There are no STK power packs, which were common in later Sony models, so the output stage layout is more traditional.

Collectibility & Value

The TA-1630 trades in the $450 - $480 range when listed, though actual sold prices are undocumented. It is not a blue-chip collectible like the ES series, but it appeals to people who want a compact, serviceable Sony integrated amp from the mid-70s. Common issues include channel distortion, often tied to failing output transistors, and degraded electrolytic capacitors, which should be replaced during restoration. Owners report that units treated well over decades can still perform reliably, but "serviced" units are more desirable given the age. No original pricing is available, but its position below the ES line suggests it was a mid-tier offering.

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