SANSUI B-2105 MOS VINTAGE

Commentary

Last model with power MOS FET 2SK405/2SJ115.

It uses an Advanced Hyper α -X balanced circuit developed to reduce the operation distortion in the transmission and amplification process to 0 during actual operation.
It is a circuit in which the driver stage is vertically symmetric balanced type linear current supply system, and the whole system from the sound inlet to the sound outlet is a closed loop, realizing a stable operating environment.

The input is a cascade of FET, and the NEW diamond differential circuit that can take out the - output without phase inversion is adopted. In combination with the driver power supply part that is vertically symmetric balanced, excellent linearity, instantaneous large power supply capability and high-speed response are obtained.

The power supply section uses a large low-vibration transformer to increase current supply capability.
In addition, it uses a closed loop configuration that is completely independent from the ground, and is free from ground noise, and always supplies a clean and stable large current.

It employs a reinforced twin monaural construction designed to eliminate the effects of vibration generated in the power supply and signal systems from the structural aspect, and realizes the optimum weight balance by placing the power supply in the center of the amplifier and arranging the power units symmetrically.
By controlling the generation and transmission of vibration and minimizing the circuit, sound image localization and phase characteristics have been obtained.

By effectively using a gold-plated pure copper oval insulator that eliminates internal interference and external vibration, as well as pure copper material and Teflon sheet, by taking advantage of its excellent damping characteristics, the effect of various vibrations caused by electrical and mechanical actions and the physical properties of the material on the sound quality is reduced.

In order to adjust the volume without damaging the music signal, the volume is configured in parallel and the contact resistance is reduced by half.
The left and right independent knobs are linked together to provide the same level of control.

All parts are gold-plated, nonmagnetic, low-impedance, high-speed, and vibration-proof.

Equipped with variable inputs (NORMAL-1, 2) and fixed inputs (NORMAL, BALANCED).

Uses Neutrik's gold-plated balanced input terminals.

Equipped with a gold plated speaker terminal for bi-wiring connection and banana plug, and gold plated RCA input terminal made by WBT.

6N copper strip bus bar adopted

The bottom chassis is a double-bottom chassis with a pure copper inner chassis and a copper-plated outer chassis.

All screws are copper plated.

Model Rating

Type	Stereo power amplifier
Effective Output (10 Hz to 20 kHz, Simultaneous Operation for Both Channels)	150W + 150W (6 Ω) 110W + 110W (8 Ω)
Total harmonic distortion factor (at effective output)	0.008% (8 Ω)
Cross modulation distortion factor	0.008% (8 Ω)
Damping factor	200 (8 Ω)
Frequency Response (1W)	DC ~ 300 kHz, + 0 -3dB
Input Sensitivity / Input Impedance (1 kHz)	1V/10k Ω
Signal-to-noise ratio (A network, short circuit)	110 dB or more
Dynamic Power	190W (6 Ω) 240W (4 Ω) 320W (2 Ω)
Envelope distortion	Below the measurement limit
TIM Strain (STRAIN)	Below the measurement limit
Slew rate	150 V / μ sec
Rise time	0.5 μ sec
Channel Separation (1 kHz)	90 dB or more
Load impedance	4 Ω ~ 16 Ω
Pwer	100 VAC, 50Hz/60Hz
Rated power consumption	360W
External dimensions	Width 460x Height 174x Depth 480 mm
Weight	37.0kg