OPERATION MANUAL MODEL : ZMA - ZEN MYSTERY AMP
REV 1 MAR 2014
Biasing your Mystery Amp
Biasing your mystery amp is easier than almost every other tube amp on the
market thanks to an extremely well thought out and tested set of controls.
These controls consist of four meters (one for each output tube) and four knobs.
The meters consist of a left and right pair representing the corresponding output
tubes on each side of the amp. Since the goal is to have each pair of tubes
perfectly match, you simply use the bias balance control.
!
STEP 1
Install tubes and hook up speakers. Never turn on amplifier without speakers
connected.
!
STEP 2
Turn master gain (volume) control all the way down (counter-clockwise)
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Right Channel
Bias Level
Right Channel
Bias Balance
Left Channel
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Bias Balance
Left Channel
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Bias Level
