PAGE 46
12AX7
V5
12AX7
V4
12AX7
V6
12AX7
V2
12AX7
V3
12AX7
V1
EL84
V9
EL84
V7
EL84
V8
EL84
V10
TUBE REPLACEMENT
MARK FIVE: 35 HEAD
FRONT OF CHASSIS
PREAMP TUBES
POWER TUBES
V1A- Input Stage CH1 & CH2
V1B- 2nd Gain Stage CH1 CLEAN & FAT
3rd Gain Stage CRUNCH
2nd Gain Stage CH2
V2A- 2nd Gain Stage CH1 CRUNCH
V2B- 4th Gain Stage CH2
V3A- 3rd Gain Stage CH1 CLEAN & FAT
4th Gain Stage CRUNCH
V3B- 4th Gain Stage CLEAN & FAT
35 Watts = V7 - V10 Pentode
25 Watts = V7, V8 Pentode
10 Watts = V7, V8 Triode
BEFORE CHANGING TUBES FLIP POWER & STANDBY SWITCH TO OFF
INPUT JACK
TO MAINTAIN WARRANTY, USE MESA/BOOGIE TUBES WHEN REPLACEMENT IS NECESSARY
FOR CUSTOMER SUPPORT, PLEASE CALL 707-778-6565 MONDAY-THURSDAY 9-5 PST, OR EMAIL US AT INFO@MESABOOGIE.COM
6 x 12AX7
V4A- Reverb Return
V4B- Reverb Send
V5A- FX Loop Return
V5B- 5th Gain Stage CH2
V6A&B- Driver/Phase Inverter
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