Audio Database

Picture of the DA-P100
Commentary

A control amplifier paired with the DA-A100.

The base potential of the first stage transistor is made equal to the ground potential by the adoption of the irregular 2 power supply (+ 75 V, -12V) so that the leakage current of the coupling capacitor is eliminated. Moreover, the base bias is supplied from the ground so that the excessive current does not flow to the cartridge when the power is turned on.

With a high power supply voltage of 86 v and an appropriate gain selection, the RIAA curve does not deviate in the high-frequency range even when the allowable input is large (260 mv).

BAX type is used for tone control.
It is designed to eliminate waviness when changing a small amount, and to be the same as a degraded state when tone control is flat.

The tone control amplifier has two stages of voltage amplification by a combination of a differential amplifier and a grounded emitter, so that the open loop gain is approximately 70 dB, and when boosted, sufficient NFB is provided to suppress the deterioration of the distortion.

By making the signal path the same whether the tone control is activated or canceled, the basic tone quality does not change.

A monitor amplifier is built-in.
The amplifier circuits for monitoring and line out are designed to withstand especially low load impedance (over 100 Ω) and long distance wiring (200m with shielded cable).

Model Rating
Type Preamplifier
Input Sensitivity / Impedance Phono1, 2 : 2mV/50k Ω
Tuner, Aux1, 2, Tape P. B. 1, 2 : 150mV/100k Ω
Output Sensitivity / Impedance Main out1, 2 : 1V/50 Ω
Line out : 1V/47 Ω
Monitor : 1V/47 Ω
Tape rec1, 2 : 150mV/470 Ω
RIAA deviation + / - 0.2 dB
Frequency characteristic 20 Hz to 20 kHz -0.5 dB
Tone control Bass : ± 10 dB (100 Hz, 50 Hz)
Treble : ± 10 dB (10 kHz, 20 kHz)
Filter Low cut:-12dB/oct(30Hz)
High cut:-12dB/oct(9kHz)
ATT -20dB
Residual noise 0.1mV
Allowable input 260mV
Equalizer input conversion noise Less than -118dB (V) (flat)
-126dB (V) or less (A-curve correction)
Semiconductor used Transistor : 34
Diode : 10 pcs
Pwer 100 VAC, 50Hz/60Hz
Power consumption 7.4W
External dimensions Width 476x Height 180x Depth 262 mm
Weight 10.4kg