Trouble Shooting Guide
If you have a problem with your amplifier, it is always best to let a fully qualified approved technician
check it over. Regular servicing should prevent any major breakdowns and is an extremely beneficial long
term precaution.
Often it is the simplest thing that needs attention and it may not be possible to get technical assistance. In
this case you may be able to keep the amp running at least until the end of the show. The greatest care
should be taken, before removing the back panel, that all mains power is disconnected. Also remember
that even after short periods valves will become very hot.
9
CH1 Clean CH2 Crunch
CH3 Lead
In case of microphony
(high pitched whistle) on
CH2 suspect V2
In case of microphony
(high pitched whistle) on
CH3 suspect V2 and/or V3
V8 - 11 Pair
V9 - 10 Pair
Phase splitter
(fault all channels dead)
View from top of Chassis
HEAD
COMBO
V8 V9 V10 V11
V7V1
V8 V9 V10 V11
V1 V2 V3 V4 V5 V6
V7
V2 V6
V3 V4 V5
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