Technics SU-8088(88A)
¥ 98,000 (around 1979)
Commentary
A pre-main amplifier developed as an Middle Class unit of the New Integrated DC-Amp series.
It employs a straight DC method in which a capacitor with a time constant is eliminated from the stage between the high-level input and the output terminal of the speaker and from the negative feedback. This realizes faithful waveform transmission from the direct current region, which is an ultra-low band, to the entire audible band.
In addition, when the operating point moves due to fluctuations in the power supply or temperature, this becomes an input signal and an ultra-low-frequency signal appears on the output side as if a DC signal has been input. As a countermeasure against DC drift, the characteristics of the pair elements such as differential and current mirror are strictly aligned and handled.
Operation can be switched between straight DC and via tone (tone control circuit insertion).
In order to eliminate distortion in the high-frequency range, a concentrated power block is adopted.
Large signals and large current components such as large capacity electrolytic capacitors, power supply circuits, drive circuits, and power transistors are compactly concentrated in a single radiator block. At the same time, the large current components are arranged using copper plates at the shortest distance, so that the influence of electromagnetic induction is completely suppressed, and even ultra-high frequency signals of up to 100 kHz can be reproduced with a margin and low distortion.
Newly developed super linear transistor is adopted.
This transistor is equivalent to having more than 200 built-in small-signal transistors with excellent high-frequency characteristics. The high-frequency reproduction limit is on the order of 100 MHz, and the Takamasu width-ratio is realized linearly from small current to large current.
Uses a peak power meter with a pure electronic FL (fluorescent display tube) that is easy to see the output level.
The lighting bar parallel display is used for easy viewing without the influence of parallax and for easy reading of the balance of the left and right channels.
Equipped with MC pre-preamp for direct use of MC cartridge.
High-precision volume is used.
A tone control circuit is adopted in which the tone control element is removed from the signal system at the midpoint.
The Rec selector has been made independent and the selector layout has been adopted in pursuit of good operability.
Uses an equalizer subsonic filter.
There are 2 variations, silver and black.
.JPG)
Model Rating
| Type | Integrated DC amplifier |
| <Overall characteristics of tuner, aux → SP out> | |
| Effective power | 20 Hz to 20 kHz : 90W + 90W (4 Ω, 0.01%) 78W + 78W (8 Ω, 0.02%) 1 kHz : 80W + 80W (8 Ω, 0.005%) |
| Total harmonic distortion rate (20 Hz to 20 kHz) | 0.006% (at rated output -3dB) |
| Power Bandwidth (THD 0.03%) | 5 Hz to 100 kHz |
| Frequency Response (Straight DC) | 20 Hz ~ 20 kHz + 0 -0.1 dB 0.2 Hz ~ 200 kHz + 0 -3dB |
| SN ratio (IHF-A, straight DC) | 110dB |
| Residual noise | 300 μ V |
| Damping factor | 50 (8 Ω) |
| Load impedance | Main or Remote : 4 Ω ~ 16 Ω Main + Remote : 8 Ω ~ 16 Ω |
| <Other characteristics> | |
| Input Sensitivity / Impedance | Phono1, 2 mm : 2.5mV/47k Ω Phono1 MC : 100 μ V/47 Ω Tuner, Aux, Tape : 200mV/47k Ω |
| Phono maximum allowable input (1 kHz, RMS) | Phono MM:250mV Phono MC:10mV |
| Pre-part total harmonic distortion factor (20 Hz to 20 kHz) | Phono MM → Rec out : 0.005% (at 5 V output) Phono MC → Rec out : 0.005% (at 5 V output) Tuner, Aux to Pre out : 0.005% (via tone) |
| Phono signal-to-noise ratio (IHF-A) | Phono MM:90dB Phono MC : 78 dB (250 μ V input) 70 dB (100 μ V Input) |
| Phono frequency characteristics | 20 Hz to 20 kHz, RIAA standard curve ± 0.2 dB |
| Tone control | Bass : ± 7.5 dB (50 Hz, turnover frequency 500 Hz) Treble : ± 7.5 dB (20 kHz, 2 kHz turnover frequency) |
| Turnover frequency | Bass : 125 Hz, 500 Hz Treble : 2 kHz, 8 kHz |
| Filter | High : 7 kHz, -6dB/oct. EQ subsonic : 20 Hz, -12dB/oct. |
| Loudness control (VR -30dB) | +7dB(100Hz) |
| Muting | -20dB |
| Output voltage | Pre out : 1 V (rated), 7 V (maximum) Rec out:200mV |
| <General> | |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 182W |
| External dimensions | Width 450x Height 142x Depth 360 mm |
| Weight | 14.5kg |