Ovation FET 3 Pre-Amp Schematic
FET preamp with passive EQ
FET 3 Passive EQ (Ovation part 703800)
9V DC (battery)
1970s
US
23 components
Single JFET preamplifier circuit with passive EQ section for Ovation acoustic guitar pickup. Features a JFET input stage (T1) biased by resistor network, passive tone-shaping EQ with bass/treble control via potentiometers R2 and R8 (250K), battery-powered 9V operation with polarity protection diodes D1/D2, and pickup input with 1M input impedance (R1). Part number 703800.
Components
R1 1M
R2 250K
R3 200K
R4 5.62K
R5 100K
R6 15K
R7 50K
R8 250K
R9 10K
R10 47K
R127
C1 .047uF
C2 .0068uF
C3 4.7uF
C4 .047uF
C5 .047uF
C6 4.7uF
T1 JFET (2N5457)
D1 diode
D2 diode
SW1 switch
SW2 switch
BATT 9V