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HEADPHONE AMPLIFIER, PREAMP, & STEREO AMPLIFIER
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 has locking connectors on both ends*. You should screw it securely onto the threads of the
DC jack.
-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 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, to avoid off/on transients. Please read this entire guide if using a DC-coupled
power amp.
*Earlier versions of the cable have no locking connectors or locking only on one side
Introduction
The MZ2 is a high quality Class A tube headphone amplifier utilizing ZOTL (Zero-hysteresis
Output Transformer-Less) technology. Additional uses of MZ2 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 most headphones
• Drives all types of dynamic and planar headphones of any impedance
• Drives speakers to adequate volume with 1watt output (small room) if speaker sensitivity
is 93db efficiency or higher, for critical listening 98db or higher is recommended.
• Transparent top cover
MZ2
USER GUIDE
Linear Tube Audio
Takoma Park, MD, USA
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Summary of Contents for Linear Tube Audio MicroZOTL MZ2S
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Page 1: User Guide
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. - Page 2 • Universal voltage power supply – works in any country automatically (the LPS can be easily switched by the user between the two most widely used voltages, with the exception being Japan) • Front switch selects between three* inputs • Preamp output *Earlier versions of the amp had only two inputs or the option between two and three.
- Page 3 Burn in Units are shipped after an initial burn in period but benefit from 50-75 more hours of use before becoming effectively fully burned-in. Rear View Speaker Outputs The amplifier outputs 1 watt (4 ohms). If your speakers are 93db efficiency or higher, speakers can be driven to a surprising volume with only a watt.
- Page 4 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 MZ2 as a preamplifier. CAUTION: when connecting to a direct coupled solid state power amplifier, the turn on and turn off transients might be dangerous to the speakers and possibly the amplifier.
- Page 5 Jumper Position 1st Version Jumper location on circuit board. set at the factory to match the tubes shipped with the unit. So, you should never need to ever change these jumpers unless you are changing from a 6SN7 to a 12SN7 or from a 12SN7 to a 6SN7.
- Page 6 In the second version of the circuit board, there is a “park” spot to put the unused jumper when configured for 6V tubes. Technology In 1996 David Berning developed a new and technically advanced vacuum tube architecture designated as ZOTL. ZOTL stands for Zero-Hysteresis Output-Transformer-Less amplifiers. The ZOTL architecture eliminated the problematic sound quality issues that audio-output transformers caused.
- Page 7 use a tube for output that is normally used for input or intermediate gain stages. The 6SN7 is respected for its linearity, but prospects for making a high-fidelity output transformer for this tube are dim indeed. With the high effective turns ratio in MZ2, the 6SN7 works well, and a 2- ohm output impedance is achieved without using negative feedback.
- Page 8 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 modify previously manufactured units.
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