Hughes & Kettner TrilogyTM - Manual (Page 11)

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Troubleshooting
Trilogy™ won’t power up when you switch it on.
• It‘s not getting AC power. Check the mains cord to see if
it is connected and firmly seated.
• The mains fuse is defective. Ensure it is replaced with another
fuse of the same rating.
Trilogy™ is connected properly, but no sound
is audible.
• The amp is set to STANDBY.
• The GAIN or MASTER knob is turned all the way down.
• The effects loop is active.
• The anode fuse has blown. Before having it replaced with a
fuse of the same rating, have the power amp tubes checked
for defects.
• The fuse for the tube heating tripped (the tubes don’t glow).
Ensure that it is replaced with a fuse bearing the same rating.
Always have a service technician replace fuses.
The sound is washed out or muddy when you switch
an effects processor on.
• The signal processor provides a wet signal that is blended
with the dry or original signal. Depending on the type of
effect, the processor may be returning a dry signal back
along with wet signal, which causes phase cancellations
when mixed to the dry signal in Trilogy™’s parallel loop.
To prevent phase cancellations, switch the effects loop
to SERIAL or turn the dry signal all the way down on the
signal processor.
The amp starts making ringing or hissing noises.
• One or several tubes are microphonic. Replace the defective
tube with another of the same type.
Signs of tube wear such as increased microphonics
and noise, treble loss, weak power output or muddy
sound begin reappearing just a few hours after
replacing tubes.
• The wrong tubes were installed when old tubes were replaced
or the amp was not biased properly. Take the amp to a
professional to correct the problem.
english
Trilogy™ Manual 1.1