PAGE 57
12AX7
V4
12AX7
V2
12AX7
V3
12AX7
V1
12AX7
V5
6L6
V6
6L6
V8
6L6
V9
6L6
V7
MARK VII
™
TUBE REPLACEMENT DIAGRAM
FRONT OF CHASSIS
PREAMP TUBES
POWER TUBES
V1A -
V1B -
V2A -
V2B -
V3A -
V3B -
V4A -
V4B -
V5A&B -
Input stage all channels
2nd Gain stage Clean and Fat, 3rd gain stage Crunch, 4th gain stage MKVII, 2nd
gain stage CH3
FX Loop Return all channels
3rd gain stage Clean and Fat, 4th gain stage Crunch, 5th gain stage MKVII, 4th gain
stage MKIIB, 5th gain stage MKIIC and MKIV
Reverb Return stage
2nd gain stage Crunch and MKVII, 3rd gain stage MKIIC and MKIV
3rd gain stage MKVII, 3rd gain stage MKIIB, 4th gain stage MKIIC and MKIV
Reverb Send stage
Driver/Phase Inverter
90 Watts: V6 V7 V8 V9 PENTODE
45 Watts: V6 V7 PENTODE
25 Watts: V6 V7 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 VISIT WWW.MESABOOGIE.COM
5 x 12AX7
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