Technics SU-3404

Commentary

A 4 ch pre-main amplifier with built-in SU-3400 solid state pre-main amplifier, 2 sets of 4 ch matrix circuits, and 4 ch control volume.

With built-in two matrix circuits, the optimum circuit for each of the 4-2-4 system and 2-2-4 system can be selected by switching the mode switch. For discrete 4 ch, the volume of the front and rear can be adjusted simultaneously.
The position of 4 ch Matrix A is a 2-2-4 type 4-ch conversion circuit. This position is used when the conventional 2-ch source is used for 4-ch conversion. In this case, the front L and R are left as they are while the rear matrix is phase-shifted.
In the position of 4 ch Matrix B, the 4-2-4 system 4-ch conversion circuit is used for the reproduction of matrix 4-ch records. In this case, both front and rear are matrixed, and the rear is phase-shifted. This position is characterized by this.
The 4 ch Discrete position is a position for playing a discrete 4 ch such as a 4 ch tape or CD-4 record.

The preset volume is a 4-channel volume. If you want to play a discrete 4-channel, you can adjust the volume of the front and rear by connecting the rear amplifier to the 4 ch Control In jack of the SU-3404. You can adjust the volume of the SU-3404.

All stages of the power amplifier are connected directly to the OCL circuit, and the outputs are fully complimentary service.

The equalizer circuit is a 3-stage direct connection circuit of PNP-NPN-PNP.

It is equipped with functions such as texiton tone control, 2-step turnover frequency switching and preset volume.

Two tape decks can be connected.

Two protection circuits, speaker protection and circuit protection are speaker protection and circuit protection.

Uses an easy connector.

Model Rating

Type	Solid state 4-ch control pre-main amplifier
Circuit system	Power Amplifier Section : Complete complimentary service, all stages directly connected OCL circuit
Power Amplifier Unit
Music Power (IHF)	120W (4 Ω) 98W (8 Ω)
Effective power (IHF)	42W/42W (4 Ω) 35W/35W (8 Ω)
Power band wiz	5 Hz to 50 kHz, -3dB
Frequency characteristic	5 Hz ~ 100 kHz + 0 -3dB
Distortion factor (at effective output)	Not more than 0.2%
Intermodulation distortion factor (60 hz : 7 khz = 4 : 1)	0.2% or Less (Effective Output)
Signal-to-noise ratio (IHF)	110 dB or more
Damping factor	50 (at 8 Ω Load)
Input Sensitivity / Impedance	1V/50k Ω
Preamplifier Section
Input Sensitivity / Impedance	Phono : 2mV/30k Ω, 50k Ω, 100k Ω Tuner, AUX : 100mV/80k Ω
Tape monitor	Rec Out : 100mV/10k Ω Playback : 100mV/60k Ω Rec/Play (DIN) : 100mV/60k Ω, 50mV/80k Ω
Output Voltage / Impedance	Rated output : 1V/200 Ω Maximum output voltage : 3 V
Phono maximum allowable input	100mV(1kHz)
Frequency characteristic	Phono : within ± 0.5 dB deviation from the RIAA standard curve Tuner, AUX : 5 hz to 60 khz, + 0 to 3 db
Tone control	Bass: 50 Hz, ± 16 dB Turnover frequency : 150 Hz, 500 Hz Treble: 20 kHz, ± 14 dB Turnover frequency : 2 kHz, 6 kHz
Loudness control	100Hz:+10dB(Volume -30dB)
<4ch Rear Out>
Rated output voltage / output impedance	600mV/10k Ω
Maximum output voltage	2.5V
Frequency characteristic	10 hz ~ 20 khz + 0 -3dB
<General>
Semiconductor used	Transistor : 37 Diode : 7 pcs
Pwer	100 VAC, 50/60Hz
Power consumption	Rated output : 70W
External dimensions	Width 410x Height 140x Depth 300 mm
Weight	10.3kg