A4 is specially designed for HIFI users who require high power output, demanding sound quality, and high-fidelity
output. The output dynamics are very large, the low frequency is full and powerful, and the high frequency penetration is excellent!
For large tubes, it is recommended to use American ON Semiconductor 0281/0302
All parameters of the power amplifier board have been strictly tested. As long as the wiring is correct, the sound can be produced without
any debugging by the user. The board has its own filtering and rectification. When properly matched, the single quality of this power amplifier
is comparable to a professional grade power amplifier board costing several thousand yuan. Reasonable ground wire layout and 40000UF filter
capacitor ensure that the noise of the power amplifier board is very low.
Because the power of the machine is relatively high, pay attention to the fact that the heat dissipation must be installed properly and coated with thermal conductive silicone.
This is a guarantee of safety. If the heat dissipation is not tightly attached under high power, the tube will be damaged during operation.
Output power: 300W+300W total 600W
Power input AC dual 20-50V, speaker protection AC independent AC 11V to 18V is available.
Frequency response 20HZ-100KHZ
Overall dimensions: 111*227mm, plate thickness 1.6mm
Harmonic distortion less than 0.005 10W/8R
Matching speakers: 4-8R 50-600W 5-15-inch KTV speakers, floor-standing speakers, stage speakers. If you buy
parts, use 10R for the silk screen 2.2R base resistor. The default configuration is 10R. After installation, debug the quiescent
current, adjust an adjustable resistor in channel 1, and test the voltage at both ends of the 0.27R 5W white cement resistor. It
can be measured as 10-50MV. It depends on the size of the heat dissipation. If the heat dissipation is insufficient, reduce the power.
pressure.
The filter capacitor is 10000UF/80V, suitable for the highest AC input AC50V.
Also note that the board can work up to AC50V, but the transformer should be within 50V as much as possible, because
the mains power of 220V will fluctuate, and in many areas it can reach 230-240V, so the board will be over-voltage.
Highlights of this product compared to similar amplifiers:
1: This circuit architecture is the most stable dual-differential fully symmetrical architecture. The sound quality is very
HIFI-like, delicate, full, natural, and very dynamic. It has more low-frequency dive. It is better than those imitation XX famous
machines, such as those with golden voices. Chili’s circuits are comparable.
2: The protection circuit is about two Omron relays, each providing 10A output current. Some so-called professional
machines on the market only use one 5A relay, but the output current is completely inadequate, and the energy
transmission is greatly reduced.
3: It can work at a maximum of AC 50V, which is close to positive and negative DC 70V and works
stably.
4: Use American ON A42 A92 for small tubes. This tube is required for foreign high-definition machines.
Use 600W transformer
