The first power amplifier released by Accuphase during the Kensonic era.
It was developed with the aim of creating an amplifier that can accurately follow even subtle changes in music and large amplitudes.
All stages are directly connected push-pull from input to output.
Therefore, the bare characteristics before applying NFB (negative feedback) have been improved.
Six high-output power transistors are used for each channel in the output stage, making this a triple push-pull configuration.
The circuit system uses a pure complementary direct connection system.
A large capacity filter capacitor of 40,000μFx2 is adopted as the power supply section.
We carefully select and select parts after testing them for changes in sound quality and durability.
We have adopted a protection circuit that uses a relay to shut off if the cord short-circuits after the output terminal, if an abnormality occurs in the speaker, or if an abnormality occurs inside the P-300.
When an abnormality occurs, the power meter lamp flashes to notify you of the abnormality.
It has a built-in bandpass filter that removes frequencies below 17Hz and above 24kHz at 18dB/octave to cut noise components such as phono motor rumble, unnecessary input caused by arm resonance in the ultra-low range, and unnecessary input in the ultra-high frequency range. .
A large power meter is used, and the display can be switched between 0dB, -10dB, and -20dB ranges.
Scaled with 8Ω load and 150W as 0dB.
Equipped with a speaker selector switch that allows you to switch between 4 sets of stereo speakers. In addition, it is possible to switch between two input systems.
One output terminal circuit and one input terminal circuit are provided inside the front sub-panel
Specifications
| Model | stereo power amplifier |
| Rated output (both channels driven, 20Hz to 20kHz, distortion rate 0.1%) |
4Ω load: 200W/ch 8Ω load: 150W/ch 16Ω load: 75W/ch |
| Harmonic distortion rate (20Hz to 20kHz) | At rated output: 0.1% or less - At 3dB output: 0.05% or less At 50mW output: 0.1% or less |
| IM distortion rate | 0.1% or less (at rated output) |
| Frequency characteristics (8Ω load) | 20Hz～20000Hz +0 -0.2dB |
| damping factor | 20 or more (8Ω load, between 20Hz and 20kHz) |
| Rated input/input impedance | 1.0V/100kΩ |
| S/N ratio (at rated output) | 100dB or more |
| stereo headphones | Low output impedance type |
| audio bandpass filter | Below 17Hz, above 24kHz, 18dB/oct |
| power limiter | Full power, 1/2, 1/4, switchable |
| Semiconductor used | Transistor: 73 Diode: 88 Thermistor: 2 IC: 1 |
| power supply | 100, 117, 220, 240V/50~60Hz |
| power consumption | No input: 100W 8Ω load rated output: 510W |
| External dimensions | Width 445x Height 152x Depth 355mm |
| weight | 25kg |
https://audio-heritage.jp/ACCUPHASE/amp/p-300.html
