SANSUI AU-7500

Commentary

This is a pre-main amplifier that uses the latest circuit technology and selected parts to pursue a high level of invisible perfection.

All stages are directly connected to the OCL pure complimentary service circuit for the power amplifier.
Stabilization is also achieved by a + - 2 power supply circuit with a large transformer and a 6,800 μ Fx2 large-capacity capacitor.

The equalizer uses a 3-stage PNP-NPN-PNP direct-coupled circuit to achieve low noise and wide dynamic range.

The protective circuit is a combination of a transistor, a diode and a relay, and four short-cut fuses are used in combination.

Uses triple tone control for low, medium, and high tones.

Equipped with two Phono inputs, and Phono2 can switch impedance.

Equipped with a 4-channel adapter terminal.

The pre-part and main part can be used independently.

Equipped with a 5-position mode selector, it can be switched between Stereo/Reverse/Normal/Mono L + R/L/R.

Equipped with muting, loudness and low / high filters.

Model Rating

Type	Pre-main amplifier
Effective power	Both channel operation 20 Hz to 20 kHz : 32W + 32W (8 Ω) 1 kHz : 40W + 40W (8 Ω) Single channel operation 1 kHz : 43W/43W (8 Ω)
Music power	150W (4 Ω, 1 kHz)
Total harmonic distortion factor (at rated output)	Main Amp : 0.1% or less
Cross modulation distortion factor	Main Amp : 0.1% or less (70 Hz : 7 kHz = 4 : 1, SMPTE)
Power Band With (IHF)	5 Hz ~ 40 kHz (8 Ω, single-channel operation)
Frequency response (at 1W output)	Phono1, 2 : 30 Hz to 15 kHz ± 0.5 dB (RIAA deviation) Aux : 10 Hz to 30 kHz ± 1.0 dB Main Amp : 10 Hz to 50 kHz ± 1.0 dB
Damping factor	40 (8 Ω)
Input Sensitivity / Impedance (1kHz)	Phono1 : 2.5mV/50k Ω Phono2 : 2.5mV/30k Ω, 50k Ω, 100k Ω MIC : 2.5mV/50k Ω Tuner, Aux, 4 ch adaptor, Tape monitor (Pin/Din) : 100mV/50k Ω Main Amp : 800mV/40k Ω
Phono maximum allowable input	300 mV (THD 0.5% or less)
Output Voltage (1 kHz)	Tape Rec(Pin/Din):100mV/30mV 4ch Adaptor:100mV Pre Amp: 0.8 V (THD 0.08% or less) 4.0 V (maximum, THD 0.5% or less)
Hum and noise (IHF)	Phono1, 2 : 75 dB or more Tuner, AUX : 80 dB or higher Main Amp : 100 dB or higher
Tone control	Bass : ± 15 dB (50 Hz) Midrange : ± 5 dB (1.5 kHz) Treble : ± 15 dB (15 kHz)
Loudness (at Volume -30dB)	+ 10 dB at 50 Hz, + 10 dB at 15 kHz
Low filter	-12dB (50 Hz, 12dB/oct.)
High filter	-11dB (10 kHz, 12dB/oct.)
Muting	-20dB
Rated power consumption (maximum)	100W(315VA)
External dimensions	Width 440x Height 140x Depth 322 mm
Weight	12.7kg