This is circuit MOSFET power amplifier OCL, Output 100w , use mosfet k134+j49 or Mosfet J162 + K1058 Output 112W at Speaker 8 OHM. Power Supply +56V/-56V 4A /Ch.

R1-15-16-21-22-17-18=1Kohm R33=68ohm 5W Q1-2=BC550C R2=47Kohm R35-36=6.8ohm 1W Q3-4=BC560C R3-4=10Mohm TR1=1Kohm trimmer Q5=BC560C R5-6-13-14=1.2Kohm TR2=1Mohm trimmer Q6=BC550C R7-12=47ohm C1=2.2uF 63-100V MKT Q7-11=BD140 R8-9-10-11=22ohm C2=1nF 100V MKT Q8-9-10=BD139 R19=82ohm C3-4=2.7nF 100V MKT Q12=IRF9540 R20=22Kohm C5=330pF Q13=IRF540 R23-26=56ohm C6-7=100uF 16V F1-2=Fuse 2.5A Fast R24=2.2Kohm C8=1uF 100V MKT L1=see text R25=560ohm C9-11-12=100nF 100V MKT J1= 2pin connector 2.54mm step [...]

Parts: R1 = 1K C1 = 1uF/35V R2 = 3,3K C2 = 470pF R3 = 100 C3 = 100uF/60V R4 = 330 C4 = 100uF/60V R5 = 3,3K C5 = 10uF/60V R6 = 1K C6 = 47uF/60V R7 = 0,33 C7 = 8,2pF R8 = 33? C8 = 0,1uF R9 = 4,7 C9 = 1uF/35V [...]

From http://www.elecfree.com/circuit/electronic-control/sound-scr-swith-by-ic-1458-scr-c106d/

R1=See Text and Picture1 IC1=LM3915 D9=Led Yellow 5mm R2=10 Kohms IC2=LM317T [On Heatsink] D10=Led Red 5mm R3=1.2 Kohms TR1=15 Kohms Multiturn Trimmer S1=2dip Switch R4=8.2 Kohms D1=1N4002 J1=3pin 2.54mm step connector R5=680 ohms[2W] D2….D8=Led Green 5mm R6=270 ohms C2-3-4=100nF 100V MKT 5% C1=100uF 25V C5=22uF 25V