Audio Database

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Commentary

Feature series preamp.

The power supply for each left and right channel and each unit amplifier are of a separate monaural configuration for the left and right channels, and the volume and switches are used with sufficient consideration for separation.
This improves the separation.

In addition to improving the separation by minimizing the number of auxiliary circuits that cause sound quality degradation, a constant voltage power supply is used for the power supply at the heart of the amplifier to eliminate interference between the circuits.

The tone circuit uses a current mirror circuit with high voltage amplification, symmetric drive and low distortion, and the filter circuit uses an inverted Darlington emitter-follower circuit to achieve low distortion.

A low-noise transistor developed by Diatone is used in the first stage differential amplifier stage of the equalizer amplifier to obtain an input equivalent noise of -126dB (V) (IHF, A-curve correction).

A variable resistor with a unique switch is used for the tone control, and the time constant circuit is completely disconnected in the flat position to obtain a flat frequency characteristic.

The tone control volume is provided separately for the left and right channels to improve the separation, and the sound quality can be adjusted separately for the left and right channels.

A muting circuit using a reed relay is adopted to prevent noise when the power switch is turned on and off.

The remote control allows direct speaker switching of the power amplifier.

It can be docked with Feature series power amplifiers.

Model Rating
Type Preamplifier
Input Sensitivity / Input Impedance
Phono1, 2 : 2.2mV/50k Ω
Tuner: 150mV/60k Ω
AUX: 150mV/60k Ω
Play: 150mV/60k Ω
Phono maximum allowable input 270 mv (1 khz, 0.1% harmonic distortion rate)
Output Voltage / Output Impedance
Pre Out (50k Ω load) : Rated 1V/600 Ω
Maximum 9V/600 Ω
Head Phone (8 Ω load) : Rated 50 mv
(at Pre Out 150 mv)
Rec: 150mV/680 Ω
Harmonic distortion factor (20 Hz to 20 kHz) 0.02% or less at 1 V output
At 9 v output : 0.05% or less
Frequency characteristic
Phono (RIAA deviation) : 30 Hz to 15 kHz ± 0.2 dB
Tuner, AUX, Play 10 Hz to 70 kHz 0 dB to 0.5 dB
Channel separation
Phono 1 kHz : 100 dB or more
20 kHz : 80 dB or more
Tuner, AUX, Play 1 kHz : 100 dB or more
20 kHz : 85 dB or more
Tone control Bass : ± 10 dB (100 Hz)
Treble : ± 10 dB (10 kHz)
Subsonic filter Low : 18 Hz, 12dB/oct.
Input reduced noise
(IHF, A-network, input short)
Phono: -126dB
Tuner, AUX, Play : -106dB
Number of semiconductors used FET:3
Transistor : 34
Diode : 15
LED:1
Pwer AC100V 50Hz/60Hz
Power consumption (Electrical Appliance and Material Control Law) 15W
External dimensions Width 425x Height 169x Depth 204 mm
Weight 5.8kg