Technics SU-4100

Commentary

2ch/4ch pre-main amplifier developed based on SU-3000.

The main amplifier section consists of all stages of directly connected OCL circuits.
The first stage consists of a low-noise PNP transistor with uniform characteristics, and the output terminal is stabilized together with a d-circle reduction circuit using a zener diode.
This main amplifier section can also be used as a 2-channel high-power amplifier with BTL connection by switching the switch.

The equalizer stage consists of a PNP-NPN2-stage direct connection circuit using specially selected low-noise transistors.

The tone control circuit is composed of the main part.

Equipped with an AFD circuit that can adjust the matrix 4 ch.
It also has a 0 ° / 90 ° phase shifter.

Equipped with rotary type low / high filter.

Equipped with 2 pairs of front and rear headphone jacks.

Equipped with a microphone terminal.

Equipped with a preset volume and four sub-volumes with independent adjustment for each channel.

The indicator lights up when playing 4 ch.

A 4 ch balancer can be connected.

There was a wood case sold separately.

Model Rating

Type	2ch/4ch pre-main amplifier
Main Amplifier Section
Music power	4 ch Operation : At BTL : 100W (4 Ω) 100W (8 Ω)
Effective power	4 ch Operation : At BTL : 12.5Wx4 (4 Ω) 11Wx4 (8 Ω) 24Wx2 (8 Ω)
Continuous Rated Output (20 Hz to 20 kHz)	4 ch Operation : At BTL : 9Wx4 (8 Ω) 24W/24W (8 Ω)
Total harmonic distortion factor	0.2%
Cross modulation distortion factor	0.2%
Power Band Wiz (for 4-ch operation)	5 Hz to 30 kHz (-3dB)
Residual noise	1mV
Damping factor	4 ch Operation : At BTL : 30 (8 Ω) 15 (8 Ω)
Load impedance	4 ch Operation : At BTL : 4 Ω ~ 16 Ω 8 Ω ~ 16 Ω
Preamplifier Section
Input Sensitivity / Impedance	Phono : 1.5mV/50k Ω Tuner, Aux1/2, Tape PB : 100mV/50k Ω Mic : 2mV/50k Ω
Maximum allowable input	Phono:120mV(1kHz) Mic:100mV
Signal-to-noise ratio (IHF)	Phono:67dB Tuner, Aux1/2 : 80 dB Mic:65dB
Frequency characteristic	Phono : RIAA deviation ± 0.5 dB Tuner, Aux1/2 : 7 hz to 60 khz + 0 to 3 db Mic : 7 Hz ~ 15 kHz + 0 -3dB
Low filter	40 Hz, -6dB/oct.
High filter	6 kHz, -6dB/oct.
Tone control	Bass : + 10 dB ~ -11dB (50 Hz) Treble : ± 10 dB (10 kHz)
Output Level / Impedance	Rec out : 100mV/500 Ω
Loudness	+8dB(100Hz)
<General>
Semiconductor used	Transistor : 48 Diode : 8 pcs
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	65W
External dimensions	Width 410x Height 140x Depth 340 mm
Weight	9.6kg
Sold Separately	Wood Case SH-747 (¥ 4,800)