Technics SU-9400
¥ 148,000 (around 1975)
Commentary
Pre-main amplifier that integrates the 9200 series (SU-9200/SE-9200).
The configuration is identical except that the power meter, input sensitivity adjustment function of Phono2, and output impedance switching are omitted.
The equalizer stage is designed so that input impedance can be switched between resistance (3 stages) and capacitance (2 stages), so that subtle changes can be obtained in the high-frequency range of frequency characteristics.
High power supply utilization factor of output stage and constant voltage power supply of ± 42 v realize high allowable input.
This reduces interference between circuit blocks and channels.
The last stage of the pre-part is equipped with SEPP of low distortion rate class A operation.
Equipped with 1.5 dB step / 11-contact rotary switch type low distortion rate NF tone control circuit.
The volume is equipped with a 26-step switch-type attenuator.
A pre-drive stage of constant current operation with improved stability in the low frequency range is adopted.
The power amplifier is designed for low distortion and high stability.
The voltage amplification stage is driven by a constant voltage power supply of ± 42 v.
Uses a 10,000 μ F capacitor.
Equipped with a unique protection circuit.
Model Rating
Type | Stereo pre-main amplifier |
Main Amplifier Section | |
Effective output (1 kHz, both channels driven simultaneously) | 103W + 103W (4 Ω) 82W + 82W (8 Ω) |
Output Bandwidth (8 ω) | 5 hz to 70 khz -3dB |
Harmonic distortion factor | 0.08% |
Residual noise | 0.3mV |
Input Sensitivity / Impedance | 1V/40k Ω |
Preamplifier Section | |
Output Voltage / Impedance | Rating : 1V/500 Ω Maximum : 10V/500 ohm |
Phono maximum allowable input | 520 mv (rms, 1 khz) |
Signal-to-noise ratio | Phono:70dB |
Tone control | Bass : ± 7.5 dB (50 Hz) Treble : ± 7.5 dB (20 kHz) |
Turnover frequency | Bass : 125 Hz, 500 Hz Treble : 20 kHz, 8 kHz |
Low filter | 15 Hz, -12dB/oct. 30 Hz, -12dB/oct. |
High filter | 10 kHz, -12dB/oct. 15 kHz, -12dB/oct. |
<General> | |
Pwer | 100 VAC, 50Hz/60Hz |
Power consumption | 190W |
External dimensions | Width 450x Height 173x Depth 380.5 mm |
Weight | 15.6kg |