SANSUI CA-2000

Commentary

A control amplifier developed based on the amplifier technology cultivated over many years.

The circuit configuration of the EQ section is a 7-chip configuration with one stage differential input with a constant current load circuit, and a pure complimentary service class A push-pull circuit is adopted for the final stage.
In addition, transistors with fewer noise figures are carefully selected to achieve stable operation over a wide bandwidth.
In addition, the RIAA deviation, which is corrected to a flat characteristic according to the regulation, adopts NF elements such as metal film resistor and styrene condenser with high precision and small error.

The input terminals are mounted on the right side panel, and a unique structure has been adopted in which the input terminal, equalizer board and input selector switch are close to each other.
In addition, shielding wires, which cause degradation of high-frequency characteristics, can be reduced and the SN ratio is improved.

The Phono input circuit is equipped with two circuits, and both input sensitivity and input impedance can be switched in three stages to bring out the performance of the cartridge.

In addition to the normal tone control, SANSUI's unique triple tone control that can adjust the mid-range is used for tone control.
Stable operation is obtained by a two stage amplifier circuit including a single differential stage including a flat amplifier in the previous stage. In addition, tone control circuits for mid-range mid-range and low - and high-range are independent and operated by a dedicated amplifier.
In addition, it is equipped with a turnover frequency switch that can adjust the sound quality over a wider range. It can be switched between three levels of low and high frequency.
The tone control circuit can be bypassed by a defeat switch.

The low filter uses a low-noise transistor and an active type with sharp cut-off characteristics. The cut-off characteristics can be switched between two levels.
In the out position, the signal is bypassed without passing through the filter circuit.

2-stage switching is possible for the high filter as well as the low filter.
Each has a different attenuation curve and can be used depending on noise conditions such as tape hiss or scratch noise in the high range. In the out position, the signal bypasses the filter circuit.

Two tape decks can be used to play and copy tapes independently.
In addition, when the deck is not used, an off position for the deck can be provided to prevent the electrical effects of the load impedance of the deck that remains connected.

Uses a continuously variable high-precision 4-series volume.
In addition, since this 4-channel volume is narrowed down at both the input and output sides, residual noise is less and the practical SN ratio is improved.

In order to ensure stable operation of each circuit, we have adopted a power transformer with good regulation and low leakage flux.
A stabilized power supply circuit with low power impedance is adopted to supply ± 2 power to all circuits.

Equipped with a -20dB audio muting switch.

Equipped with a tuner selector switch that can be selected by one touch operation.

Stereo / Reverse / L + R/L/R mode switch

A pre-out selector is mounted on the front panel.

It has a built-in amplifier for headphones only.

Built-in muting circuit for eliminating click noise when power is on / off.

Model Rating

Type	Stereo control amplifier
Output voltage (rated output)	Preamplifier output : 1 V Recording Output (Pin/Din) : 150mV/30mV
Maximum Output Voltage (1 kHz)	12 V (THD 0.1% or less)
Total Harmonic Distortion Factor (Aux)	Not more than 0.03%
Intermodulation Distortion Factor (Aux, 70 hz : 7 khz = 4 : 1, SMPTE)	Not more than 0.03%
Frequency Characteristics (Rated Output)	10 Hz ~ 80 kHz + 0.5 -1dB
RIAA deviation (20 Hz to 20 kHz)	+ / - 0.2 dB
Channel Separation (Rated Output, 1 khz)	60 dB or more
Signal-to-noise ratio (IHF, A-network, short circuit)	Phono1 : 75 dB or more Aux, Tape mon : 90 dB or more
Input Sensitivity / Impedance (Rated Output, 1 kHz)	Phono1 : 2 mV, 4 mV, 8mV/30k Ω, 50k Ω, 100k Ω Phono2 : 2mV/50k Ω Aux, Tuner, Tape play : 150mV/50k Ω
Phono maximum allowable input	1000 mV (1 kHz, THD 0.1%, input sensitivity 8 mV)
Tone control	Bass : ± 10 dB (30 Hz) Midrange : ± 5 dB (1.5 kHz) Treble : ± 10 dB (20 kHz)
Tone selector	Bass : 600 Hz, 300 Hz, 150 Hz Treble : 2 kHz, 4 kHz, 8 kHz
Low filter	-3dB at 20 Hz, 12dB/oct. -3dB at 60 Hz, 12dB/oct.
High filter	-3dB (7 kHz), 6dB/oct. -3dB at 12 kHz, 12dB/oct.
Muting	-20dB
Rated power consumption	20W
External dimensions	Width 460x Height 176x Depth 345 mm
Weight	9.9kg