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Diagram of

Circuit Diagram 1251-0-350F

Active 3-transistor guitar preamp with tone shaping Ovation Breadwinner 1251-0-350F 9V (B1) and 18V (B2) dual battery supply 1970s US 44 components

Ovation Instruments factory circuit diagram for the Breadwinner guitar model 1251-0-350F. Three-stage active transistor preamp featuring bridge and neck pickups routed through a pickup selector switch (S1), three common-emitter transistor gain stages (Q1, Q2, Q3) with RC coupling, front and rear tone controls (750K and 250K pots), a 1 henry inductor (L1) in the output filter network, and a dual battery power supply (9V and 18V). Includes red LED power indicator (F1) and phase/tone switching (S2). Note on schematic states all capacitance values in microfarads unless otherwise specified.

Components

R1 750K
R2 50K
R3 100K
R4 150K
R5 10K
R6 475K
R7 150K
R8 475K
R9 221K
R10 22.1K
R11 750K
R12 475K
R13 18.2K
R14 10K
R15 2.52K
R16 100K
R17 5.62K
R18 100K
C1 .047uF
C2 1uF/50V
C3 .0047uF
C4 .22uF
C5 .0068uF
C6 .0068uF
C7 1uF/50V
C8 10uF/25V
C9 .1uF
C10 .0056uF
C11 100pF
Q1 transistor
Q2 transistor
Q3 transistor
S1 pickup selector switch
S2 tone/phase switch
S3 output jack switch
B1 9V battery
B2 18V battery
F1 red LED indicator
L1 1hy inductor
J1 output jack
Bridge Pickup
Neck Pickup
Tone Front pot 750K
Tone Rear pot 250K

Guitar Models

1251 · Breadwinner & Deacon 1251 1251-5 · Breadwinner & Deacon 1251-5 1251-6 · Breadwinner 1251-6 White 1251-7 · Breadwinner 1251-7 Tan

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Breadwinner & Deacon 1251-5 (1251-5) Breadwinner 1251-6 White (1251-6) Breadwinner 1251-7 Tan (1251-7)
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