Ovation Optima Pre-Amp Schematic Set
preamp
Ovation Optima
9V battery / 48V phantom power
1990s
US
13 components
5 diagrams
Complete 5-sheet schematic set for the Ovation Optima guitar preamp. Includes: Input Board (Dwg 40-601BH, Rev 2, dated 6/22/94) with FET input stage, state variable notch filter, and frequency sweep; Output Board (Dwg 40-604BH, Rev 2, dated 9/22/94) with balanced XLR output driver and 1/4 inch jack; Auto Chromatic Tuner Board (dated 9/21/95) with note indicator LEDs and 32.768KHz crystal oscillator; Slider Board (Dwg 40-602BH, Rev 2, dated 6/22/94) with tuner on/calibrate, battery management, V REF generation, and low battery LED indicator; plus exploded assembly view and Optima Preamp Service Guide cover (Part #980149-A). Drawn by NM, checked by b.h.
Components
2SK427 JFET
MC33178 dual op-amp
TL062 op-amp
2N5088 NPN transistor
1N4741A 11V Zener diode
1N5817 Schottky diode
1N914 signal diode
1N4021 diode
piezo transducer
state variable notch filter
auto chromatic tuner IC
bipolar LED indicators
32.768KHz crystal