40 WATTS POWER AMPLIFIER PARTS LIST AND SPECIFICATIONS:
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Rated Power Output: 20W - 40W RMS 
Load impedance: 4 - 16 Ohm
Frequency Response: 25Hz - 1.2MHz (-3dB)
THD: 0.1% (1kHz/85% Power)
Input Signal: 1Vpp (full power)
Input Impedance: 45k
Overload and Short-Circuit protected

RESISTORS:
R1 = 82k
R2 = 10k
R3 = 100k
R4 = 6k8
R5,R8 = 680R
R6,R14,R16 = 100R
R7 = 1k
R9 = 330R
R10 = 1k5
R11,R12 = 220R
R13,R18 = 8k2
R15,R17,R19 = 10R
R20, R21 = 0R12 / 3W (0.12 Ohms)
All resistors 0.25W 5% unless noted otherwise.

CAPACITORS:
C1 = 0.47uF/100V
C2,C4 = 100uF/50V
C3 = 3300pF/100V
C5 = 10pF/100V Ceramic
C6 = 220uF/50V
C7 = 3300uF/50V radial or axial

SEMICONDUCTORS:
T1,T2,T3,T5 = PN2222 or eq.
T6 = 2N2907  or eq.
T4 = BD138, BD 238, MJE172
T7 = MJE15029, TIP31B
T8 = MJE15028, TIP32B
T9,T10 = 2N3055, MJE3055T, TIP3055, 2N3772
D1 = 1N4001
NOTE: T7, T8, T9 T10 mounted on heatsink

POWER SUPPLY:
Power Transformer:
20 Watts = B+ 34VDC = Utr = 24VAC Ver.A or 2x24VAC Ver.B; Fuse F2= 1A
35 Watts = B+ 42VDC = Utr = 30VAC Ver.A or 2x30VAC Ver.B; Fuse F2= 1.25A
42 Watts = B+ 47VDC = Utr = 33VAC Ver.A or 2x33VAC Ver.B; Fuse F2= 1.5A
Line Fuse F1= 1A
All fuses MDL rated.
For Stereo Amplifier, double amperages of transformer and fuses.

Power Supply Capacitors:
Mono 2 x 1500uF/50V
Stereo 2 x 3300uF/50V

PCB NOTE:
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PCB size: 3.00" x 5.25" = 7.65mm x 13.40mm
Layout design for: T1, T2, T3, T5, T6 = TO92 (EBC)
T4 = TO-126 (SOT32) (ECB)
T7, T8 = TO-220

Supply sources:
www.futurlec.com
www.web-tronics.com
www.jameco.com