1. The board is a single-channel power amplifier board, which requires a dual channel. 2. The circuit uses a dual differential circuit with high-voltage audio-pair tubes (A970/C2240 and A1145/C2705) for voltage amplification to promote the use of medium-power pair tubes (A1837/C4793). The output stage uses high-power pair tubes (A1943/C5200). 3. The power supply range is DC ±20V-90V. As long as sufficient power is supplied, it can easily reach 200 watts. The sound quality is good, the driving force is strong, and the 15-inch speaker is driven hard! 4. Power supply: dual voltage, DC ±20-90V (the upgraded version has optimized the circuit and components, but for direct application of high voltage, it is recommended to use below 90V; do not question the voltage limit.) 5. Actual power: undistorted power 200W, maximum power 300W.
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