It is Class A power amplifier,

Using  IRFP9140N high current field-effect transistor.

PASSLAB commonly uses this pair of tubes, and A50-L15 also uses this pair of tubes. But the effect is better than all PASSLAB pure Class A.

The effect surpasses similar A-class PASS A30, KRELL KSA50, and JLH1969 Golden Voice A-class on the market.

The voltage of the power supply is DC+-35V. It can be obtained by rectifying with AC24-0-24V transformer.

Pure Class A 50W 8-ohm amplifier.

Radiator recommendation: 3KG per channel

15CM long and 7.5CM wide, including angle aluminum, with a height of 3CM

1 pair A50W amplifier boards