50W Class-B power amplifier circuit

Power amplifier Class-B is the most popular operating modes, and possibly more than 99% of the current series of power amplifier designed and manufactered are of this class. Defining the Class-B is the amount of bias voltage that causes conduction of both output devices to overlap with the current and thus produce the minimum amount possible crossover distrosi.

This Class-B power amplifier performance :
Power Output________________________ 50W
RL Impedance_______________________ 8R
Distortion__________________________ Below 0.0006% at 1 kHz and 50W/8R
Slew rate___________________________ Approximately 35V/us
Noise______________________________ -91dBu at the output
EIN_______________________________ -117dBu (referred to input)
Frequency response__________________ +0, -0.5dB over 20Hz-20kHz
Part List :

Resistor
R1,R8____________________________10K
R2,R3,R13________________________100R
R4_______________________________150R
R5,R10___________________________1K
R6,R7____________________________68R
R9_______________________________500R
R11______________________________220R
R12,R24__________________________100R
R14______________________________18R
R16,R17__________________________0.1R 5W
R18______________________________10R 5W
PR1______________________________1K trim


Capacitor
C1_______________________________ 10uF
C2_______________________________ 220uF
C3_______________________________ 100pF
C4_______________________________ 4u7F
C5_______________________________ 1uF
C6_______________________________ 100nF 400V
C7_______________________________ 15pF
C7,C8____________________________ 100nF
C8,C10___________________________ 220uf

Diode
D1_______________________________ 1N4148

Transistor
Tr1,Tr3,TR5,TR14__________________ MPSA56
Tr4,Tr10,Tr13______________________ MPSA06
Tr6_______________________________ MJE340
Tr7_______________________________ MJ802
Tr8_______________________________ MJE350
Tr9_______________________________ MJ4502