Main Parameters:
1. Channel Type: 1 Piece Mono Channel (without heat sink)
2. Amplifier Type: Class AB/A (adjustable Class A/B)
3. Main Power Supply: ±18V to ±90V DC or ±12V to ±15V AC (suitable for 24 -50V)
Dual winding 50-500W transformer
4. Protection circuit power supply: 12V to 15V DC or AC separate power supply
5. Output power: 400W
6. Harmonic distortion:<0.005%
7. Signal to noise ratio:>100DB
8. Frequency response: 5HZ-100KHZ
9. Matching speaker: 4-8250-400W
10. Circuit board length: 22CM, width: 5CM
Product features:
1. Classic fully symmetrical double differential architecture, HF1 has delicate, natural, and full sound quality, excellent dynamic performance, and multiple protection circuits;
2. Quiet on/off without any impact sound;
3. The background noise is extremely low, and no noise can be heard;
4. Small zero drift, with an output zero drift voltage of less than 10MW (between -5MV and+5MW), and relatively stable performance;
5. High power Toshiba tube output stage with strong power;
6. The installation and wiring of the circuit board are simple and do not require further debugging.
The shipment does not come with a heat sink and has been adjusted to Class A and Class B. To switch to a Class A power supply, the power must be sufficient and the volume of the heat sink must be large enough. After adjustment, the temperature of the heat sink should not exceed 60 degrees Celsius during long-term operation.
The amplifier board has multiple protections:
1. Delay protection: Power on delay connection to prevent surge current from impacting the speaker during the moment of power on;
2. Short circuit protection: When a short circuit occurs in the output circuit, disconnect the power supply to protect the speaker and amplifier;
3. Overload protection: When the load is too large and has not reached a short-circuit state, and the output current exceeds the rated current, the output circuit is disconnected to protect the power amplifier;
4. Overheating protection: When the power amplifier operates in a high temperature environment greater than 70 degrees, overheating protection is activated to protect the power amplifier;
5. DC protection: When the DC voltage at the output terminal of the power amplifier exceeds the limit, the output circuit is disconnected to protect the speaker;
6. Midpoint protection: If the midpoint voltage experiences abnormal drift, disconnect the output circuit to protect the speaker.
