Audio Database

PMA-930V
Commentary

A pre-main amplifier with a non-feedback power amplifier.

The power amplifier section is a non-feedback 0 db amplifier in which the voltage amplifier stage and the power amplifier stage are completely electrically separated to reduce dynamic distortion such as TIM distortion and all kinds of distortion. Moreover, the effect of the back electromotive force from the speaker on the predriver stage is suppressed.
In addition, Pc100W power transistor is adopted to obtain high power.

A multi-shielded power transformer and -shielded power transformer and a 16,400 μ F block capacitor.

By using a super equalizer in the equalizer amplifier section, a wide bandwidth is achieved.
In addition, the MC/MM is switched by the in-flight remote control to prevent deterioration of the SN ratio due to wiring.

It is equipped with wide-band real-time tone control with limited quality degradation and subsonic filter.

Equipped with high-speed protection circuit.

Model Rating
Type Pre-main amplifier
<Power Amplifier Unit (Tuner → SP out)>
Rated output 80W + 80W (6 Ω)
70W + 70W (8 Ω)
Input Sensitivity / Impedance 150mV/30k Ω
Total harmonic distortion factor Not more than 0.007%
Cross modulation distortion factor Not more than 0.003%
TIM distortion factor Measurement limit value or less
Slew rate ± 150 V / μ sec or more
Output bandwidth (both channel drive) 5 Hz ~ 80 kHz (THD 0.1%)
Frequency response (at 1W output) 4 Hz ~ 250 kHz + 0 -3dB
Output Impedance (1 kHz) 0.1 Ω
Output terminal Speaker AORb : 6 Ω ~ 16 Ω
Speaker A + B : 12 Ω ~ 16 Ω
Headphone Jack : 230mW/8 Ω
Preamplifier Section
Input Sensitivity / Impedance Phono MM : 2.5mV/47k Ω
Phono MC : 0.2mV/100 Ω
CD, Tuner, Video, Tape : 150mV/30k Ω
Maximum Output / Rated Output 10V/150mV
Total harmonic distortion factor 0.001% or Less (1 kHz, 8 V)
RIAA deviation 20 Hz ~ 100 kHz ± 0.3 dB (MC)
<General>
SN ratio (input ratio (input short circuit, weight A) Phono MM : 86 dB (at 2.5 mV input)
Phono MC : 70 dB (at 0.25 mV input)
CD, Tuner, Video, Tape : 106 dB at 150 mV input
Tone control Bass : ± 10 dB (100 Hz)
Treble : ± 10 dB (10 kHz)
Subsonic filter 18 Hz, 6dB/oct.
Loudness control characteristic Low frequency : + 7 dB (100 Hz)
High frequency : + 6 dB (10 kHz)
Pwer 100 VAC, 50Hz/60Hz
Power consumption 150W
External Dimensions (including legs, knobs, terminals) Width 434x Height 112x Depth 393 mm
Weight 9.3kg