Epiphone Valve Jr.
•
Mercury Upgrade Kit
47
This project and its documentation is the result of technical investigations made by the engineering staff of
Mercury Magnetics
. The disclosure of the information herein may pertain to proprietary rights and
the furnishing of these documents does not constitute an expresed or implied license to use such materials.
yellow and maybe put a piece of shiny tape on
it to make it more visible. You can even put a
fuse in series with the resistor on the discharge
tool in case you forget to remove it.
Filter capacitors are wired in parallel, so draining
one should drain them all, but never assume.
Always recheck for residual voltage in every filter
capacitor until there’s absolutely no doubt in your
mind that all are drained.
Less than 5 volts is safe, but I prefer to drain mine
to 1 volt for peace of mind. Don’t be surprised if you
find the capacitors slowly recharging themselves.
This phenomenon is known as dielectric absorption
and is quite normal in electrolytic capacitors. The
filter caps shouldn’t recharge to a lethal level, but
leave the discharge tool in place while working on
the amp.
A few final notes:
1. Never work on an amp if you’re tired, fatigued,
frustrated or intoxicated.
2. Never work while distracted.
3. Never work on an amp around small children.
There are just too many dangers involved to
take that chance.
4. Try to have a plan in case something does go
wrong. You might consider asking someone in
your household to take a CPR class.
5. Take your time and don’t rush.
6. Use common sense.
http://tubenewbie.com/discharge_capacitors.html
Summary of Contents for Epiphone Valve Junior
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