Technics SU-3100

Commentary

This is a pre-main amplifier that uses the all-stage direct connection ITL-OTL-OCL circuit used in the SU-50A and SU-3600.

A monolithic IC is used in the drive stage of the main amplifier to improve the SN ratio and characteristics.

The equalizer circuit is a combination of PNP-NPN transistors.
The first stage uses specially selected PNP transistors and has succeeded in reducing noise.

Separate left and right level meters are used on the front panel to monitor the output level of the left and right channels.

Equipped with a microphone terminal.

It has a built-in matrix circuit that takes out 4 ch output from 2 ch source. By connecting 4 speakers, you can enjoy matrix 4 ch playback.

Model Rating

Type	Solid state pre-main amplifier
Circuit system	ITL-OTL-OCL circuit
Power Amplifier Unit
Music Power (IHF)	46W (4 Ω) 40W (8 Ω)
Effective power (IHF)	18W/18W (4 Ω) 16W/16W (8 Ω)
Power band wiz	7 Hz to 35 kHz, -3dB
Frequency characteristic	10 Hz to 100 kHz, + 0 -3dB
Harmonic distortion factor	0.08%
Residual noise	1 mV or less
Signal-to-noise ratio	90dB
Damping factor	40 or More (8 Ω Load)
Input Sensitivity / Impedance	200mV/30k Ω
Preamplifier Section
Input Sensitivity / Impedance	Phono1 : 2mV/50k Ω Phono2 : 7mV/50k Ω Tuner : 150mV/60k Ω AUX1, 2 : 150mV/60k Ω MIC : 28mV/50k Ω
Tape Monitor 1, 2	Rec Out : 150mV/5k Ω Playback : 200mV/90k Ω Rec/Play (DIN) : 35mV/80k Ω
Output Voltage / Impedance	Rated output : 0.2mV/2k Ω Maximum power : 3 V
Phono allowed input	Phono1:100mV(1kHz) Phono2:300mV
Frequency characteristic	Phono1 and 2 : deviation from RIAA standard curve within ± 1 dB Tuner : 10 hz to 100 khz, + 0 to 3 db AUX1, 2 : 10 Hz to 100 kHz, + 0 -3dB
Tone control	Bass : 100 Hz, + 10 dB to -10dB Treble : 10 kHz, + 10 dB to -10dB
Loudness control (Volume -30dB)	100 Hz, + 8 dB 10 kHz, + 3.5 dB
High filter	6 kHz, -6dB/oct.
<General>
Semiconductor used	IC:2 Transistor : 13 Diode : 11
Pwer	100 VAC, 50/60Hz
AC outlet	Switched : 1 system Unswitched : 2 lines
Power consumption	Rated output : 55W
External dimensions	Width 394x Height 119x Depth 283 mm
Weight	6.5kg