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You have to understand how to safely work inside the chassis
of a tube amp. Just reading this is not enough, but here are
a few tips: Never work on a amplifier that is plugged into the
wall socket, always unplug it first! Stand on a rubber mat of
some sort and don't work bare foot, under the influence of alcohol
or any other drug, legal or not for that matter. Here is another
good tip: Only probe an amp with you're right hand and with you're
left hand by you're side. So if you do happen to take a high
voltage shock, the the voltage will not go across you're chest!
High Voltage is stored in the electrolitic capacitors and they
need to be discharged! That's what I'm doing in this pic.
These are those large round can's and there usually blue or black.
The discharge tool is made of 600 Volt wire with a 3-5 watt resistor
of 500 to 1000 ohms. Basically you clip one side to ground then clip
the other end to the Pos + side of the capacitor. If I have two cans
as seen here then there are actually 4 capacitors 2 in each can, so I
will take the time and clamp the discharge tool on all 4. Some cans
can have more that 2 as well. Check with you're
multimeter set to 600 DC volt setting and make sure the voltage has
been fully discharged.Please read through these two Links:
How much voltage can kill?
A Must Read!
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Marshall 18 Watt 
