Troubleshooting - Hughes & Kettner TRIAMP Manual

TRIAMP - Manual

6.0 TROUBLESHOOTING

TriAmp is not getting any power:
- Check the mains cable to see if it is connected properly.
- The mains fuse is defective. Replace the fuse with another
identical fuse.
TriAmp is connected properly, but no sound is audible:
- The amp is set to STANDBY.
- One or several GAIN and MASTER controls are turned all
the way down. Dial in a higher setting.
- The FX-MIX control is turned all the way to WET but you
have not connected a processor to the FX loop. Switch the
FX LOOP off or turn the FX-MIX knob to DRY.
- The anode fuse is blown. Before you replace the fuse,
examine whether the power amp tubes are defective.
Fuse keeps on blowing.
- After replacing the fuse, with standby off, turn on the
power. Watch the power tubes, turn standby on. Look for
tube "flash" before fuse blows, indicating excess oxygen
within the tube. This will show which power tube needs to
be replaced.
The FX LOOP is on when it shouldn't be.
- The FX LOOP is deactivated when the front panel button,
the STAGEBOARD button and the MIDI module switching
function are off. If any of these three switches is on, the
circuit is active.
The sound is thin and muddy when the effects processor is
active.
- The signal processor is causing phase cancellations that are
being added to the original signal in the parallel loop. To
avoid phase cancellations, turn the FX-MIX control all the
way to the right (WET), and adjust the mix at the processor
itself.
When in use with a loud PA, the RED BOX DI OUT circuit is
causing feedback even though the amp is set to a low
MASTER volume.
- Speakers connected to a tube amp may have microphonic
properties. Turn TriAmp's MASTER volume up and the circuit
will stop feeding back. In extreme cases of microphonic
speakers, you would either turn the PA down or mic the
cabinet.
Your amp is producing ringing noises or tends to feedback.
- One or several tubes are microphonic. Replace the
appropriate tube with another of the same type.
After just a few hours of operation, your amp is displaying
the typical characteristics of old tubes (increased
microphonics and noise, treble loss, weak power output,
muddy sound).
- You have installed the wrong tubes or the bias is not
adjusted properly. Take the amp to a professional amp
technician to correct the problem.
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