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MZ2/ 

MZ2-S 

HEADPHONE AMPLIFIER, PREAMP, & STEREO AMPLIFIER 

USER GUIDE 

Linear Tube Audio 

Takoma Park, MD, USA 

WARNING: For safety, the cover of this amplifier should be secured at all times.

 DC 

voltages as high as 450V and peak AC voltages as high as 800V are present inside. The service 
information contained in this manual is intended only for trained service personnel. Furthermore, 
this amplifier generates radio-frequency energy that can interfere with communications 
equipment.  

Quick Start Guide 

-Remove the amp and power supply from the box and bags. 

-Plug the AC cable into the power supply and into an outlet.  

-The DC cable will have one end with a locking connector and one end with a plain connector. The 

locking connector attaches to the back of the amp, where you should screw it securely but not as tight as 

you can onto the threads of the DC jack.  

-Insert the non-locking end of the DC cable into the DC jack on the power supply.  

-Turn on the power supply using its toggle switch (if you are outside the US, make sure the voltage is set 

correctly on the linear power supply, which is visible directly above the IEC connector).  

-Turn on the amp with the power button on the faceplate. You may want to attach interconnects or 

speakers before powering on, but it isn’t necessary. If you are using the MZ2/MZ2-S as a preamp, it is 

best to have your power amp off (and 

necessary to have it off if it is a DC-coupled amp

) when 

powering on and connecting the MZ2/MZ2-S, to avoid off/on transients. 

Please read this entire guide if 

using a DC-coupled power amp.  

Introduction 

The MicroZOTL2.02.0 is a high quality Class A tube headphone amplifier utilizing ZOTL (Zero-
hysteresis Output Transformer-Less) technology. Additional uses of MicroZOTL2.0 include 
tweeter amplifier, preamplifier, and high-efficiency speaker amplifier recommended for small 
rooms or desktop setups. 

 

Features 

External power supply – extremely low noise floor 

More than enough power for standard headphones 

Drives all types of dynamic and planar headphones of any impedance 

Summary of Contents for MZ2

Page 1: ...n the power supply Turn on the power supply using its toggle switch if you are outside the US make sure the voltage is set correctly on the linear power supply which is visible directly above the IEC connector Turn on the amp with the power button on the faceplate You may want to attach interconnects or speakers before powering on but it isn t necessary If you are using the MZ2 MZ2 S as a preamp i...

Page 2: ...10 000 hours Power Supply The power supply for the unit is in a separate case The external power supply has a connection to the AC cord and a connection for 12V Output A cable with 2 5mm mini plug connectors on either end is attached between the power supply and the main amplifier unit Other manufacturer s power supplies may be used as long as they supply 12VDC at 2 amps The MicroZOTL2 0 is fused ...

Page 3: ...king mechanism in which case the preamp and speaker outputs are disconnected when headphones are plugged in Preamplifier Outputs There is a pair of RCA jacks on the back of the unit labeled Preamp Out which is designed to provide the input for a power amplifier when using the MicroZOTL2 0 as a preamplifier CAUTION when connecting to a direct coupled solid state power amplifier the turn on and turn...

Page 4: ... pairs of RCA jacks on the back of the unit labeled Input 1 and Input 2 If you have requested a third input it will be active when the switch is in the unmarked center position The faceplate for remote units which has a hole for the IR sensor has all three input positions marked In the case of only having two inputs those are the two you would use ...

Page 5: ... need to ever change these jumpers unless you are changing from a 6SN7 to a 12SN7 or from a 12SN7 to a 6SN7 To set the jumpers for 6 volt operation using a 6SN7 there should be only one jumper installed across 3 and 4 you can store the extra jumper on pin two so that it is not connected to any other jumper For 12 volt operation one jumper should be installed across 1 and 3 and a second jumper shou...

Page 6: ...turns ratio of the output transformer determines the impedance matching between the output tube s and the speaker There are practical limits to how large this ratio can be made because of the parasitic elements of the windings and it is difficult to make an output transformer with more than a 25 1 ratio With the ZOTL technology the impedance matching is determined by the effective turns ratio of t...

Page 7: ...ivity 0 6V RMS for full output Output impedance measured at 0 5A 60 Hz 2 ohms Input impedance 50k 100V 120V 240V operation Auto switching or manually switched with linear power supply Hum and noise minimum 60µV RMS or 90dB below full output 20Hz 20kHz Carrier 50dB 250kHz Power consumption from ac power source 33W Power output with 4 ohm load 1W 1 THD Power output with 14 ohm load 0 5W 1 THD Channe...

Page 8: ...esulting from physical abuse or unauthorized alterations or repairs or from tube rolling or damage to exterior finish resulting from careless use The warranty is void if the serial number has been removed altered or defaced 4 This warranty is void if improper voltage is applied to any input or output 5 Linear Tube Audio reserves the right to improve or change its products without obligation to mod...

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