CONTENTS
BILL OF MATERIALS 2
TEST PROCEDURE 4
Introductory remarks 4
Amplitude responses 4
THD measurements 5
Input level 5
Miscellanesous 5
Reference curves 6
DIAGRAMS 8
Components layout 8
Control switches wiring diagram 9
Power supply wiring diagram 9
Schematics 10
1
BILL OF MATERIALS
Ref Type Spec Spec2 Spec3 Spec4
C1 Capacitor 10uF 20% Electrolytic radial 45V
C2 Capacitor 10uF 20% Electrolytic radial 45V
C3 Capacitor 10uF 20% Electrolytic radial 25V
C4 Capacitor 10uF 20% Electrolytic radial 25V
C5 Capacitor 4700uF 20% Electrolytic radial 45V
C6 Capacitor 4700uF 20% Electrolytic radial 45V
C7 Capacitor 100nF 5% Metallised film lp 5.08
C8 Capacitor 10uF 20% Electrolytic radial 25V
C9 Capacitor 100nF 5% Metallised film lp 5.08
C10 Capacitor 10uF 20% Electrolytic radial 25V
C11 Capacitor 220pF 5% Metallised film lp 5.08
C12 Capacitor 220pF 5% Metallised film lp 5.08
C13 Capacitor 100nF 5% Metallised film lp 5.08
C14 Capacitor 100nF 5% Metallised film lp 5.08
C15 Capacitor 1nF 5% Metallised film lp 5.08
C16 Capacitor 1nF 5% Metallised film lp 5.08
C17 Capacitor 1nF 5% Metallised film lp 5.08
C18 Capacitor 1nF 5% Metallised film lp 5.08
C19 Capacitor 220pF 5% Metallised film lp 5.08
C20 Capacitor 1nF 5% Metallised film lp 5.08
C21 Capacitor 22uF 20% Electrolytic radial 16V
C22 Capacitor 100nF 5% Metallised film lp 5.08
C23 Capacitor 22uF 20% Electrolytic radial 45V
C24 Capacitor 100nF 5% Metallised film lp 5.08
C26 Capacitor 1.5nF 5% Metallised film lp 5.08
C27 Capacitor 15nF 5% Metallised film lp 5.08
C28 Capacitor 2.2nF 5% Metallised film lp 5.08
C29 Capacitor 10nF 5% Metallised film lp 5.08
C30 Capacitor 2.2nF 5% Metallised film lp 5.08
C31 Capacitor 100nF 5% Metallised film lp 5.08
C32 Capacitor 470nF 5% Metallised film lp 5.08
C33 Capacitor 100nF 5% Metallised film lp 5.08
C34 Capacitor 22uF 20% Electrolytic radial 45V
C35 Capacitor 22uF 20% Electrolytic radial 16V
C36 Capacitor 100nF 5% Metallised film lp 5.08
D1 Diode 1N4148
DB1 Bridge rectifier 4A Vrrm = 100V KBU402G
IC1 Dual OP amp OP275GP
IC2 Quad Op amp TL074CN
IC3 Quad Op amp TL074CN
IC4 Power Op amp TDA7294V
IC5 Power Op amp TDA7294V
J0 Mains socket IEC type flange fixing with 20x5
fuse
J1 Connector NCJ6FKH
J2 Header 8w - 2rows HE14
L1 Resistor 0 Ohms
L2 Resistor 0 Ohms
L3 Resistor 0 Ohms
L4 Resistor 0 Ohms
L5 Resistor 0 Ohms
L6 Resistor 0 Ohms
2
Ref Type Spec Spec2 Spec3 Spec4
LED1 LED 5mm Blue standard
R1 Resistor 10k 1% Metal film 0.25W
R2 Resistor 20k 1% Metal film 0.25W
R3 Resistor 10k 1% Metal film 0.25W
R4 Resistor 30k 1% Metal film 0.25W
R5 Resistor 200R 1% Metal film 0.25W
R6 Resistor 2k2 1% Metal film 0.25W
R7 Resistor 200R 1% Metal film 0.25W
R8 Resistor 1k3 1% Metal film 0.25W
R9 Resistor 470R 1% Metal film 0.25W
R10 Resistor 15k 1% Metal film 0.25W
R11 Resistor 47k 1% Metal film 0.25W
R12 Resistor 100k 1% Metal film 0.25W
R13 Resistor 15k 1% Metal film 0.25W
R14 Resistor 6k8 1% Metal film 0.25W
R15 Resistor 8k2 1% Metal film 0.25W
R16 Resistor 220k 1% Metal film 0.25W
R17 Resistor 8k2 1% Metal film 0.25W
R18 Resistor 200k 1% Metal film 0.25W
R19 Resistor 5k6 1% Metal film 0.25W
R20 Resistor 16k 1% Metal film 0.25W
R21 Resistor 1k 1% Metal film 0.25W
R22 Resistor 16k 1% Metal film 0.25W
R23 Resistor 4k7 1% Metal film 0.25W
R24 Resistor 2k 1% Metal film 0.25W
R25 Resistor 68k 1% Metal film 0.25W
R26 Resistor n/f
R27 Resistor 15k 1% Metal film 0.25W
R28 Resistor 10k 1% Metal film 0.25W
R29 Resistor 18k 1% Metal film 0.25W
R30 Resistor 18k 1% Metal film 0.25W
R31 Resistor 18k 1% Metal film 0.25W
R32 Resistor 1k5 1% Metal film 0.25W
R33 Resistor 27k 1% Metal film 0.25W
R34 Resistor 1k 1% Metal film 0.25W
R35 Resistor 27k 1% Metal film 0.25W
R36 Resistor 12k 1% Metal film 0.25W
R37 Resistor 13k 1% Metal film 0.25W
R38 Resistor 10k 1% Metal film 0.25W
R39 Resistor 13k 1% Metal film 0.25W
R40 Resistor 2k2 1% Metal film 0.25W
SW1 Toggle switch SPDT 7101SHZQ
SW2 Toggle switch SPDT 7101SHZQ
SW3 Toggle switch SPDT cent.
off
SW0A Rocker switch DPST Snap fit
SW0B Rotary switch DPDT Voltage selector
T1 Transformer Toroidal Dual primary Tannoy TI-
U1 Voltage
regulator
U2 Voltage
regulator
LM317LZ
LM337LZ
7103SHZQ
65220
3