Mesa/Boogie Heartbreaker Owner's Manual download pdf (Page 19)

5AR4

12AX7

REAR OF CHASSIS

GRAY

REVERB

WHITE

(Each 12AX7 contains two separate Triodes)

V 7 V 6 V 5 V 4 V 3 V 2 V 1

B A

Partial View Of Chassis

6L6's (stock) EL-34's or 6V6's (TWEED Only)

PAGE 15

Description of Tube Functions

V1A=Ch.1 Input Stage (LO Gain) V4A= Ch.2 Third Lead Stage

Ch.1 Second Lead Stage (HI Gain) (Tone Recovery Stage)

V1B= Ch.1 First Lead Stage (HI Gain) V4B= Ch.2 Fourth Lead Stage

V2A= Ch.1 Third Gain Stage V5= Phase Inverter

(Tone Recovery Stage) V6A= Reverb Return

V2B= Ch.1 Forth Gain Stage V6B= Reverb Send / Driver

V3A= Ch. 2 Second Lead Stage (HI Gain) V7A= FX Return

V3B= Ch.2 Input Stage (LO Gain) V7B= FX Send

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Mesa/Boogie Heartbreaker Owner's Manual Page 19