Amplifier parts:
R1__________________6K8 1W Resistor R2,R4_____________470R 1/4W Resistors R3__________________2K 1/2W Trimmer Cermet R5,R6_______________4K7 1/2W Resistors R7________________220R 1/2W Resistor R8__________________2K2 1/2W Resistor R9_________________50K 1/2W Trimmer Cermet R10________________68K 1/4W Resistor R11,R12______________R47 4W Wirewound Resistors
C1,C2,C4,C5________47µF 63V Electrolytic Capacitors C3________________100µF 25V Electrolytic Capacitor C6_________________33pF 63V Ceramic Capacitor C7_______________1000µF 50V Electrolytic Capacitor C8_______________2200µF 63V Electrolytic Capacitor (See Notes)
D1_________________LED Any type and color D2________Diode bridge 200V 6A
Q1,Q2____________BD139 80V 1.5A NPN Transistors Q3_____________MJ11016 120V 30A NPN Darlington Transistor (See Notes) Q4_____________MJ11015 120V 30A PNP Darlington Transistor (See Notes)
SW1_______________SPST Mains switch
F1__________________4A Fuse with socket
T1________________220V Primary, 48-50V Secondary 75 to 150VA Mains transformer (See Notes)
PL1_______________Male Mains plug
SPKR______________One or more speakers wired in series or in parallel Total resulting impedance: 8 or 4 Ohm Minimum power handling: 75W
Preamplifier circuit diagram:
Preamplifier parts:
P1_________________10K Linear Potentiometer P2_________________10K Log. Potentiometer
R1,R2______________68K 1/4W Resistors R3________________680K 1/4W Resistor R4________________220K 1/4W Resistor R5_________________33K 1/4W Resistor R6__________________2K2 1/4W Resistor R7__________________5K6 1/4W Resistor R8,R18____________330R 1/4W Resistors R9_________________47K 1/4W Resistor R10________________18K 1/4W Resistor R11_________________4K7 1/4W Resistor R12_________________1K 1/4W Resistor R13_________________1K5 1/4W Resistor R14,R15,R16_______100K 1/4W Resistors R17________________10K 1/4W Resistor
C1,C4,C8,C9,C10____10µF 63V Electrolytic Capacitors C2_________________47µF 63V Electrolytic Capacitor C3_________________47pF 63V Ceramic Capacitor C5________________220nF 63V Polyester Capacitor C6________________470nF 63V Polyester Capacitor C7________________100nF 63V Polyester Capacitor C11_______________220µF 63V Electrolytic Capacitor
Q1,Q3____________BC546 65V 100mA NPN Transistors Q2_______________BC556 65V 100mA PNP Transistor
J1,J2___________6.3mm. Mono Jack sockets
SW1_______________SPST Switch
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