Specifications

OPERATION MANUAL MODEL : ZMA - ZEN MYSTERY AMP! REV 1 MAR 2014
Installing Tubes
Refer to the illustration below for tube placements. Right channel is shown, simply
do the same for the left channel.
!
WARNING: If the amp was plugged into the wall, and the power
switch was turned on and then off again, enough time would have passed to fully
charge the large 500 volt caps. Do not insert tubes if the 500 volt caps have been
charged. Unplug the amplifier and let it set for 8 hours to let the charge drain away
before installing tubes. Do not turn amplifier on until all tubes have been installed.
Installing the OA3 tube in particular while the 500 volt caps are charged will cause
an arc inside the OA3 tube and likely damage the tube, not to mention scare the
crap out of you when it happens.
!
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OA3
6N23P
6N23P
KT66
KT66