SANSUI AU-3300

Commentary

This pre-main amplifier is based on the concept of focusing on sound quality, with power and sound quality adjustment function.

All stages are directly connected OCL circuit with ± 2 power supply system without harmful coupling condenser.
In addition, the differential amplifier, which is the core of this circuit, uses dual transistors with uniform characteristics and excellent stability, and achieves highly stable operation even against DC fluctuations.
Power transistors of the same polarity (NPN-NPN and PNP-PNP) are connected to the complimentary service stage, and pure output system is adopted.

The equalizer circuit uses a PNP-NPN2-stage direct-coupled circuit that combines a low-noise transistor and carefully selected equalizer elements.

The tone control section uses a 2-stage direct-coupled tone amplifier with carefully selected transistors and a CR-type tone control circuit with highly accurate elements. The knob uses a Klix/Klukš top type that can be adjusted in 10 stages each.

Equipped with a microphone mixing circuit with a microphone level adjustment function.
Mixed sound can be output from the recording terminal.

Equipped with two speaker outputs.

An all-push button type one touch selector is installed for input switching.

Click noise generated at switch switching is reduced by using ± 2 power supply.

It is equipped with a protection circuit that combines an electronic circuit and a relay.

Features include loudness control, high-cut and low-cut filters, -20dB audio muting, and a stereo / mono mode switch.

Model Rating

Type	Pre-main amplifier
Effective power	35W + 35W (8 Ω, both channel operation, 40 Hz to 20 kHz) 38W + 38W (8 Ω, both channel operation, 1 kHz) 40W + 40W (8 Ω, single-channel operation, 1 kHz)
Music power	140W (4 Ω, 1 kHz)
Total harmonic distortion factor	Not more than 0.15%
Intermodulation Distortion Factor (70 Hz : 7 kHz = 4 : 1, SMPTE)	0.2% or Less (Rated Output)
Power Band With (IHF)	10 Hz ~ 40 kHz (8 Ω)
Frequency Response (at 1W)	10 Hz ~ 40 kHz + 0.5 -1.5 dB
RIAA deviation (30 Hz to 15 kHz)	± 0.5 dB
Damping factor	50 (8 Ω)
Input Sensitivity / Impedance	Phono : 2.5mV/50k Ω Mic : 2.5mv/10k Ω Tuner, Aux, Tape Monitor : 130mV/50k Ω
Phono maximum allowable input	230 mv (1 khz, THD 0.2% or less)
Output Voltage (1 kHz)	Tape Rec(Pin):100mV
Channel Separation (1 kHz)	Phono : 60 dB or more Tuner, Aux, Tape rec : 65 dB or higher
Hum and noise	Phono : 75 dB or more Mic : 65 dB or more Aux, Tuner, Tape Monitor : 90 dB or higher
Tone control	Bass : ± 12 dB (50 Hz) Treble : ± 12 dB (15 kHz)
Loudness (at Volume-30dB)	+ 10 dB at 50 Hz, + 8 dB at 10 kHz
High filter	-3dB (7 kHz), 6dB/oct.
Low filter	-3dB (100 Hz), 6dB/oct.
Muting	-20dB
Power consumption	76W (Rating) 210W maximum
External dimensions	Width 400x Height 120x Depth 240 mm
Weight	6.3kg