Ovation Volume-Only Preamp Schematic (Drawing 700400)
single-transistor volume-only preamp
Ovation 700400 (model 2.375)
9V (battery)
1980s
US
14 components
Factory schematic for the Ovation volume-only preamp circuit, drawing number 700400, shown at 3x scale. Single-transistor buffered preamp design with pickup input, 9V battery supply, dual 100mH inductors, and 100K volume potentiometer driving an output jack. Revised 2/19/83. Intended for acoustic-electric guitars requiring only volume control without tone shaping.
Components
transistor (NPN)
1 MEG resistor
100K resistor
50K trimmer pot
15K resistor
47K resistor
5.62K resistor
100K volume potentiometer
0.047uF capacitor
0.22uF capacitor
4.7uF 25V electrolytic capacitor x2
100mH inductor x2
pickup input
output jack