6
Tube Replacement
Tube life varies depending upon playing style and application. Power tubes have a
much shorter life than pre-amp tubes which can last for years. To maintain the
optimum performance of your amplifier, the tubes should only be replaced with the
same type as specified on the tube illustration below.
When changing tubes ALWAYS unplug the amplifier and remember that the
TUBES ARE HOT! Wait for the tubes to cool or replace tubes when amplifier has
not been used for several hours.
Your Cornell-Plexi 18/20 amplifier has 4 valves: two pre-amp valves 12AX7 or
ECC83, two power valves EL84 and a rectifier GZ34.
Valve Failure
When a valve breaks down its internal elements can short. This can cause major
damage to the internal components of the amplifier and also be a possible fire risk.
There are two fuses which will break under faulty conditions: one fuse is mounted
on the back panel and the other is on the chassis. Remember to replace the fuses
with the same type and rating.
Remember – we are always happy to assist in any we can, so please do not
hesitate to contact us.
Chassis Valve Line Up
Mains
Transformer
Output
Transformer
EL84 EL84
ECC83
Front panel
CAUTION CHASSIS SURFACE HOT
GZ 34
ECC83
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