Aleph-30 Class-A Power Amplifier Circuit

The Pass Aleph 30 is the first of the second generation of Aleph single-ended Class A power amplifiers. This design stems from my commitment to creating the best-sounding product, a simple circuit with the most natural features. The Pass Aleph 30 combines powerful Mosfet devices and pure single-ended Class A operation in a simple two-stage topology whose sole purpose is to recreate subjectively natural sound.

Aleph-30 Class-A Amplifier Project

Class A power amplifiers SPECIFICATIONS

Gain 20 dB balanced, 26 dB single ended
Freq. Response – 0.5 dB @ 2 Hz, -1.5 dB @ 100 KHz
Power Output 30 watts/ch @ 8 ohms, 40 watts @ 4 ohms
Maximum Output 25 volts, 5 amps
Distortion (1KHz) 0.2% @ 30 watts, 8 ohms
Input Impedance 47 Kohm single-ended, 52 Kohm differential
Damping factor 100
Crosstalk -80 dB 20-20 KHz
Balanced Input Rejection -50 dB typical CMRR
Output Noise 500 uV unweighted
Random noise floor 5 uV typical
DC offset 100 mv
Power Consumption 200 watts
Temperature 25 degrees C. above ambient
Dimensions 17 ” W x 15.5″ D x 5.5″ H
Shipping Weight 45 lb.

Source: www.skip.informatik.gu.se/~kmg/diyaudio/projects/aleph30 Aleph-30 pcb schematic Alternative link: