Specifications
OPERATION MANUAL  MODEL : ZMA - ZEN MYSTERY AMP!  REV 1 MAR 2014 
Components 
Please refer to the diagram below to identify the remaining components of a Zen 
Mystery Amp. 
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A1 A2 A3
A5 
A4 
A6 
A7 
A8 
A9
A10 
A11 
A12 
A13 
A14 
A15 
A1  Left XLR Input Jack   
A2  Left RCA Input Jack 
A3  Left Balanced XLR input transformer 
A4  Left Output transformer 
A5  Left Power Supply transformer 
A6  Left Bias Level Control 
A7  Left OA3 Voltage Regulator Tube 
A8  Left 500V Power Supply Capacitor 
A9  Left output tube (1 of 2) 
A10  Left output tube (2 of 2) 
A11  Left phase inverter tube 
A12  Left input tube   
A13  Bias Meter for A10 tube 
A14  Bias Meter for A9 tube 
A15  Balance Control for Bias Meter’s A13,A14
B1  Right XLR Input Jack   
B2  Right RCA Input Jack 
B3  Right Balanced XLR input transformer 
B4  Right Output transformer 
B5  Right Power Supply transformer 
B6  Right Bias Level Control 
B7  Right OA3 Voltage Regulator Tube 
B8  Right 500V Power Supply Capacitor 
B9  Right output tube (1 of 2) 
B10  Right output tube (2 of 2) 
B11  Right phase inverter tube 
B12  Right input tube   
B13  Bias Meter for B10 tube 
B14  Bias Meter for B9 tube 
B15  Balance Control for Bias Meter’s B13,B14
B15 
B14 
B10 
B11 
B9
B12 
B13 
B8 
B7 
B6 
B5 
B4 
B3 B2 B1










