Technics SU-3500
¥ 86,800 (released in 1973)
Commentary
A pre-main amplifier that improves circuit stability with a constant voltage power supply of ± 40 v.
The EQ circuit is a 3-stage direct-coupled circuit configuration using a differential-amplified 2-power supply system with a pure complimentary service SEPP output stage.
In addition, the input impedance can be switched in 3 levels of 25k Ω / 50k Ω / 100k Ω.
The main amplifier section is composed of a pure complimentary service OCL circuit connected to all stages. In addition, the power supply voltage is lowered and two 10,000 μ F electrolytic capacitors are used for the output stage to pursue low distortion rate and high stability.
The tone control circuit is NF-type and equipped with a tone defeat switch that instantly restores the characteristics.
Uses a preset volume that can also be used as an audio mute.
Two tape decks can be connected.
Equipped with two Phono terminals.
Model Rating
Type | Stereo pre-main amplifier |
Circuit system | Fully complimentary service all-stage direct-coupled differential-amplification OCL circuit |
Music power | 190W (4 Ω) 125W (8 Ω) |
Effective power (1 kHz, both channel drive) |
55W + 55W (4 Ω) 43W + 43W (8 Ω) |
Output Bandwidth (8 ω) | 5 hz to 70 khz -3dB |
Harmonic distortion factor | 0.08% |
Signal-to-noise ratio | Phono:70dB |
Damping factor | 100 (8 Ω) |
Phono maximum allowable input | 510mV(1kHz) |
Tone control | Bass : ± 12 dB (50 Hz) Treble : ± 12 dB (20 kHz) |
Low filter | 30 Hz, -12dB/oct. |
High filter | 8 kHz, -12dB/oct. |
Pwer | 100 VAC, 50Hz/60Hz |
Power consumption | 110W |
External dimensions | Width 410x Height 140x Depth 340 mm |
Weight | 10.2kg |