OPERATION MANUAL MODEL : ZMA - ZEN MYSTERY AMP
REV 1 MAR 2014
STEP 3
Plug in the amplifier and turn on the power switch. As the tubes heat up you will
see the bias meters start to rise. After the needles have stopped rising simply use
the bias balance control for each pair of meters to make them match.
!
STEP 4
Adjust the bias level controls so that the meters read 50ma. 50ma is exactly in the
middle of the meter’s range.
!
STEP 5
As the amplifier warms up you can re-adjust things. Once the amplifier has been
on for 30 minutes make a final adjustment and then you won’t have to adjust
anything again unless a tube begins to change. From this point on, regardless of
how well the meters match when you first start your amp, they will always be
matched at the 30 minute point and stay that way until you turn your amplifier off.
Of course not all tubes are perfect, and tubes do age with use so we made it very
easy to adjust the balance at a glance.
!
!
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