Reverb; Tube Task Chart - Mesa/Boogie MARK 1 RE-ISSUE Owner's Manual

MARK I

TUBE TASK CHART

Partial View Of Chassis
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.
12AT7
B A
GRAY

REVERB

V 4
WHITE
6L6
( View from above - looking down on chassis )
12AX7
12AX7
B A B A
V 2
V 3
B A
(Each 12AX7 contains
two separate Triodes)
V 5
12AX7
6L6
REAR OF CHASSIS
Description of Tube Functions
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
12AX7
B A
V 1
6L6
6L6
V4 A =
Reverb Drive
V4 B =
V5 A =
Phase Inverter
V5 B =