Technics SU-V New Class A integrated amplifiers · c. 1979–1983
Technics SU-V8
TechnicsModel SU-V8 · Integrated amp
889296100104108 MHz
L · dB
R · dB
Power
The story
The SU-V8 is a high-power model in Technics’ SU-V integrated amplifier range, released in Japan in December 1979. Technics rated it at 110 watts per channel into 8 ohms from 20 Hz to 20 kHz, with THD quoted at 0.003% at 3 dB below rated output. Its headline feature is Technics’ “New Class A” output stage: a synchronous bias circuit keeps the output transistors from switching off, which Technics marketed as eliminating switching and crossover distortion while running far cooler than true class A. Despite the badge, it is not a pure class-A amplifier. The rest of the design follows the era’s high-end checklist: DC-coupled “Straight DC” circuitry, separate power supplies for each channel, moving-magnet and moving-coil phono inputs, a Super Bass control and automatic speaker protection. At about 35 pounds it is a substantial box. It suits buyers who want a powerful, well-specified early-80s Japanese integrated with a built-in MC stage, and who are comfortable having the idle current set by a technician.
Known variants
SU-V8X (c. 1983 successor with Technics’ microcomputer-controlled “Computer Drive” New Class A bias)
Before you buy
The pre-purchase checklist
Checklist · 6 checks
- 01Ask whether the idle (bias) current has been checked against the service manual, since the SU-V8 has several adjustment steps and a drifted setting can trip protection or add distortion.
- 02Confirm the protection relay engages after power-on and does not drop out at normal volume.
- 03Listen for buzzing, popping or one dead channel when switches are operated, which usually means dirty switches and controls rather than failed parts.
- 04Check that the New Class A emblem lamp and other indicators light.
- 05Ask about packing, because a dropped unit can crack the driver circuit board.
- 06Test both the MM and MC phono inputs if you plan to use a turntable.
On eBay
Find one on eBay
We haven’t reviewed current listings for the SU-V8 yet.
Until we do, search eBay for the exact model number and use the checklist above on every listing: ask for photos of it powered on, and a note of what has been serviced.
After you buy
Search supplies on Amazon →Service supplies
Noisy volume and tone controls and crackly selector switches are the usual first job on a used SU-V8. Contact cleaner fixes most of it; bias and offset adjustments belong to the service manual or a technician.
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