Bow Technologies WALRUS
¥ 760,000 (around 2000)
Commentary
A stereo power amplifier with a powerful power supply and dual monaural construction.
The voltage stage of the amplifier circuit uses a JFET/BJT cascode and high-efficiency current mirror configuration single amplification, and operates at a high supply voltage for a simple design close to the vacuum tube system. The driver stage also uses a single MOS-FET for high current configuration.
The complimentary service stage consists of two high-power / high-speed MOS-FET output pairs.
Current feedback is used instead of the normal voltage feedback.
Since the current feedback is extremely fast, it has the advantage of reducing TIM distortion and other factors that interfere with sound quality and improving high-frequency characteristics.
The feedback circuit is limited to a minimum value of 20 dB.
The power supply consists of four 350 VA toroidal transformers, one for the positive and negative power supplies of each channel, for a total of 1400 VA full dual monaural construction.
We use carefully selected parts, such as Wima polypropylene capacitors, low ESR electrolytic capacitors, and high speed / soft reversible rectifiers.
The input can be balanced or unbalanced.
The WBT connector is used for the speaker output terminal for by-wire connection.
It has a balanced and unbalanced throughput output that is convenient for bi-amplifier drive.
When the main power supply of the rear panel is turned on, the logo letters of the front panel light up sequentially, and when all of them light up, the operation state is activated.
The O part of the BOW logo on the front panel is the standby switch.
.jpg)
Model Rating
| Type | Stereo power amplifier |
| Effective power | 150W + 150W (8 Ω) 300W + 300W (4 Ω) |
| Input sensitivity | 2V RMS |
| Input impedance | 50k Ω |
| Output impedance | 0.1 Ω or less |
| Distortion factor | 0.1% |
| Output bandwidth | 2 Hz to 300 kHz -3dB |
| Signal-to-noise ratio | 100dB(A-WTD) |
| Negative feedback | 20dB |
| Channel balance | Within 0.1 dB |
| Power consumption | 110W (idle) 1400W at maximum output |
| External dimensions | Width 434x Height 160x Depth 390 mm |
| Weight | 33kg |
.jpg)