Technics SU-8055 (1979–1980)
A stereo integrated DC amplifier from Technics, produced around 1979-1980, with a capacitor-free signal path.
Overview
The Technics SU-8055 is a stereo integrated DC amplifier made by Technics during the late 1970s to early 1980s. Technics designed it to improve waveform fidelity by leaving out coupling capacitors in both the signal path and the negative feedback loop. The aim was cleaner audio transmission across the full frequency range. It has an independent recording and playback selector, so input and record sources are controlled separately. It also has an FL peak power meter that shows output levels from 0.1W to 100W as a bar graph.
Specifications
| Product type | Stereo Integrated DC Amplifier |
| Manufacturer | Technics |
| Production years | 1979–1980 |
| Original price | ¥51,800 (approx. 650 DM) |
| Frequency response | 20Hz to 20kHz |
| Output bandwidth | 5 Hz to 30 kHz (-3dB) |
| Speaker load impedance | 4Ω |
| Total harmonic distortion | 0.03% |
| Signal-to-noise ratio | Phono: 82dB, Tuner/Aux/Tape: 97dB, Mic: 70dB |
| Phono maximum allowable input | 150mV |
| Tone control | Bass: ±10 dB (50 Hz), Treble: ±10 dB (20 kHz) |
| Subsonic filter | 30 Hz, -6dB/oct |
| Power requirement | 100 VAC, 50Hz/60Hz |
| Power consumption | 100W |
| Dimensions | 430 x 142 x 255 mm (WxHxD) |
| Weight | 7.2kg |
Design
The SU-8055 is DC-coupled. There are no coupling capacitors in the signal path or in the negative feedback circuit, which is how it gets its waveform fidelity. The first stage of the power amplifier uses a single-package dual transistor, run with a current mirror load for low distortion. The output stage uses Power Pack ICs built on a two-stage Darlington connection, in a pure complementary symmetry circuit. The recording and playback selector was newly developed for this amp and lets record and input selection work independently.
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