Details：

Musical Fidelity A1 is a very classic circuit. Whether it is human voice, high frequency or low frequency, it has very good expressiveness

This board adopts the original circuit of A1 without any change. With my more than ten years of drawing experience, this circuit has a very high signal-to-noise ratio and replica. This board is more suitable for DIY assembly, and I think the layout and rationality of this circuit are no less than the original.


Matching of materials and components:

The power tube adopts the brand-new original imported MJ15024 / 15025 audio tube king, and the push tube adopts on ml340 / 350 resistance. Taiwan kunmao coarse copper pin 1% high-precision resistance. In order to fully express the voice of Britain, all capacitors adopt Elna natural silk film capacitor, which makes the sound softer

Parameters:

Output power: 20W + 20W

Output impedance: 4 Ω - 8 Ω

Operating voltage: +/-DC30v-45v

Transformer voltage: Dual AC20-28v, recommended Dual AC26V

Mono pcb size:48 x155x1.6mm

Radiator requirements: radiator not less than 300 X 80 X 50mm

Note:

This is one pair amplifier board pcb ,not included any parts !

The price is for one pair pcb ,stereo amplifier !

Image 1 - HiFi Power Amplifier Board PCB Pure Class A 20W Amp Musical Fidelity A1 Circuit

Image 2 - HiFi Power Amplifier Board PCB Pure Class A 20W Amp Musical Fidelity A1 Circuit

Assembled baord ，just for reference：

Image 3 - HiFi Power Amplifier Board PCB Pure Class A 20W Amp Musical Fidelity A1 Circuit

Image 4 - HiFi Power Amplifier Board PCB Pure Class A 20W Amp Musical Fidelity A1 Circuit