Technics SE-A7000 (1992)
A high-powered stereo amplifier using a proprietary MOS class AA circuit, released in December 1992.
Overview
The Technics SE-A7000 is a stereo power amplifier released by Technics in December 1992. It is based on an earlier SE-A7000 model, with each component refined individually. It delivers substantial power across multiple impedance loads. It also has extensive anti-vibration construction, balanced inputs, and a precision power meter. The circuit is a unique MOS class AA design. MOS FETs handle the voltage control stage, and bipolar transistors run the current supply amplifiers to improve speaker drive.
Specifications
| Rated output | 240W + 240W (4 Ω, 20 Hz–20 kHz, 0.005%) |
| Rated output | 200W + 200W (6 Ω, 20 Hz–20 kHz, 0.005%) |
| Rated output | 170W + 170W (8 Ω, 20 Hz–20 kHz, 0.005%) |
| Frequency characteristic | 0.8 Hz ~ 150 kHz +0 -3dB |
| Signal-to-noise ratio | 120dB (IHF'66) |
| Signal-to-noise ratio | 93dB (EIAJ) |
| Input Sensitivity / Impedance Normal/DC | 1.2V / 47k Ω |
| Input Sensitivity / Impedance Balance | 1.2V / 600 Ω |
| Meter indication range | 0.0001W ~ 300W (8 Ω) |
| Power | 100 VAC, 50Hz/60Hz |
| Power consumption | 420W |
| External dimensions | Width 483 mm x Height 208 mm x Depth 476 mm |
| Weight | 38kg |
Design
The SE-A7000 uses a newly developed MOS class AA circuit. All speaker current comes from the current supply amplifier via the class AA bridge effect. The voltage control amplifier uses MOS FETs as the amplifying element. The current supply amplifiers use bipolar transistors for strong current delivery. The power supply has three transformers - one each for the left and right current supply amplifiers, and one for the shared voltage control amplifier. They are wound with oxygen-free copper wire and enclosed in a 3-layer magnetic shield with special resin. Total power supply capacitance is 93,600 μF, using 10 anti-vibration smoothing capacitors. Internal wiring uses OFC bus bars, LC-OFC, and 6N ESC-OCC, with left and right channels fully isolated. The chassis has a 3 mm thick heavyweight top plate, high rigidity construction, large insulators, and real wood mirror-finish side panels. The balanced inputs use a DL-type permalloy core transformer that resists external magnetic interference. The high-precision peak power meter has 10 mm thick bronze glass. It reads output from 0.0001W to 300W and has a light ON/OFF switch. The speaker terminals are large gold-plated connectors on an aluminum base. They take thick cables and use an electronic selector with gold-clad contacts. A non-inductive resistor and a PC-OCC power cord with polarity indication finish the design.
Market
The Technics SE-A7000 was originally priced at ¥450,000 at launch. It is now sold on the vintage market as a collectible high-end amplifier.
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