Details:

Based on the famous Sugden A21 pure class A amplifier circuit.

Mono 21W pure class A single-ended OTL power amplifier board

Power supply voltage: AC32V*1(mono 150W)

Output power: 21W

Quiescent current: 800mA~1000mA

Debugging method: Before power on, adjust the potentiometer clockwise to the end. After the power-on test sound is normal, turn it counterclockwise and adjust the voltage across the 1-ohm resistor to 800mV-1V.

Use Rubycon 50V/10000uF main capacitor imported from Japan.

Use new Sanken transistor C3284.

PCB size: 224*71MM

Net weight: about 0.24KG

Package list:

1 × Assemble Amplifier Board

Note: This is mono board, if you need stereo, you need to buy two

Protect board ：https://www.ebay.com/itm/354215938961