checkinG and adjustinG the Bias is eXtremely easy to do By FolloWinG
this Procedure:
WARNING: Removing the rear panel will expose the tubes. These are VERY hot and touching them
should be avoided. This procedure should only be carried out by technically competent people and at
their own risk.
• Ensure Power and Standby switches are in the down (off) position. Remove rear panel.
• Connect amp to speaker (or dummy load) and power supply.
• Turn Master Volume to minimum and turn Power switch on.
• At this point only the blue LED should be on.
• On rear panel set the Power Level switch to Full and PowerPan to fully Solid State.
• Allow amp to warm up for a few minutes.
• Turn from Standby to fully on and observe the Bias Status LEDs.
• If the green LED is lit then the Bias Adjust is set correctly and can be left alone.
• If the red LED is lit then the bias is too high, if blue LED is lit the bias is too low.
• To adjust, carefully insert a trimmer tool into the Bias Adjust hole and locate the control inside,
while being very careful to not touch the tubes. Once in position, turn counter-clockwise to lower
bias, clockwise to increase the bias. The optimal setting is green just before the red comes on.
• Once it is set, turn off amp and immediately replace the rear panel.
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MN™-100 GUitAr AMplifier
