TRIAMP MK II - MANUAL
6.0 TROUBLESHOOTING
TriAmp® MK II 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® MK II 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 anode fuse is blown. Before you replace the fuse, examine whether the power amp tubes are defective.
•The fuse for the tube heater blew (the tubes don’t glow). Make absolutely certain to check the rating when replacing this fuse. It is a super- slo blo TT 15 A fuse. This type of fuse is relatively uncommon and may be hard to find in your area. That’s why your TriAmp® MK II shipped with a replacement fuse. Be sure to have a service technician replace the fuse.
The sound is thin and muddy when the effects processor is active:
•The effect device routes back a dry signal that is added to the original dry signal in the parallel effects loop. Depending on the type of em- ployed effect device, the phase position of the dry return signal can lead to cancellations when the return and original signals are mixed. To fix this problem, switch the effects loop to SERIAL or turn the dry signal all the way down on the effect device.
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® MK II’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.
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.
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 profes- sional amp technician to correct the problem.
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