Mark i, Tube task chart – Mesa/Boogie MARK 1 User Manual

Page 12

GRAY

REVERB

WHITE

TUBE TASK CHART

MARK I

V 5

NOTE: Before changing tubes, flip the POWER SWITCH to the off position or to STANDBY.
CAUTION: Tubes are HOT when they have been in use.

Partial View Of Chassis

(Each 12AX7 contains
two separate Triodes)

V 2

V 3

V 4

V 1

B A

REAR OF CHASSIS

( View from above - looking down on chassis )

6L6

12AX7

B A

12AT7

V1 A = Input 1 - Stage 1

V1 B = Input 2 - Stage 1

V2 A = FX Return Stage

V2 B = Final Pre-Amp Stage

V3 A = Tone Control Recovery Amp

V3 B = Reverb Return Stage

V4 A =
V4 B =
V5 A =
V5 B =

Description of Tube Functions

Reverb Drive

Phase Inverter

GE 8