We now offer NOS 12AT7 tube options in the Tubes section. Purchase a pair to be installed in your amp or just an extra set. 12AU7 tubes also work in the MZ2, though the gain will be lower. This will only make a noticeable difference if using certain headphones or speakers.
•All units now have 3 inputs.
•We have upgraded our DC umbilical cable and the standard length is 2'. A 4' cable is available for a $20 upcharge.
•Now available with a Silver faceplate.
Questions about the differences between MicroZOTL2.0, MZ2, and MZ2-S? See the FAQ for an explanation.
Currently ships in 10-14 days.
The successor to David Berning's original micro-ZOTL, the MZ2 continues to offer what Berning intended it to: an introduction to ZOTL technology.
Equally a headphone amplifier, integrated amplifier, and preamp, the MZ2 is considered reference-grade for powering almost any headphone, as a 1 wpc amp for extremely efficient speakers, and as a preamp performing well above its price.
Hand-built by our small team just outside of Washington, DC, each MZ2 involves 12 hours of delicate work, including precise hand-winding of several proprietary components, and several days of burn-in and testing.
While technically an OTL amplifier, not having traditional output transformers, the MZ2 is an entirely different kind of circuit that is able to achieve low output impedance and low-current tube operation, which translates to easy matching to almost any headphone or speaker and a very long tube life. ZOTL technology results in amps with the transparency of OTL without the many limitations of OTL designs: purely tube amplification that achieves a theoretically ideal turns ratio and happily interacts with speakers from 2 to 16 ohms, or above. Headphones from 16 to 600 ohms are powered without any hum.
A new feature of the MZ2 is an on-board jumper that allows the user to switch between using 6SN7 and 12SN7 tubes.
We also now offer premium DC cables for the connection between the amp and the power supply. Visit the cables section of the shop to purchase.
- Designed by David Berning - one of the world’s premier amplifier designers
- Hand-made just outside Washington, DC
- External power supply - extremely low noise floor
- Drive high efficiency speakers (95db efficiency or higher) to adequate volume.
- Transparent cover
- Universal voltage power supply or high quality linear power supply
- 3 selectable inputs
- Class A preamplifier output
- Transformer-less design eliminates intermodulation distortion inherent in all transformer designs
- Simulates the correct transformer turns ratio using impedance converter
- Low impedance output easily matches wide range of headphones and speakers
- No heavy power or audio transformers
- Optimized tube life expectancy of 10 - 20 years based on use
- One year warranty including tubes (international pays shipping)
Amplifier class: Push-pull Class A, no feedback
Sensitivity: 0.6V RMS [full output]
Output impedance: (measured @ 0.5A, 60 Hz) 2 ohms
Input impedance: 50k
Power Supply Input: Auto-switching 100V / 120V / 220 / 240V operation or linear supply user-switchable between 110/120 and 220/240 (contact us if in need of a 100V linear supply)
Power Supply Output: 12VDC 2.5 amps
Hum and noise: minimum 60mV RMS or 90dB below full output (20Hz-20kHz)
Power consumption from ac power source: 33W
Power output: with 4-ohm load: 1W, 1% THD, with 14-ohm load: 0.5W, 1% THD
Channel separation: (4-ohm loads) 46dB, 100Hz-10kHz, (14-ohm loads): 54 dB, 100Hz-10kHz
Frequency response full power: (4-ohm load) +0, -1dB 10Hz-20kHz, (14-ohm load): +0, -1dB 5Hz-50kHz,
Voltage gain: (4-ohm load): 10.3dB, (14-ohm load): 12.4dB
Size: amp: 9 1/2 inches (24.1 cm)wide, 4 3/4 inches (12.0 cm) tall, 7 7/8 inches (19.7 cm) deep (including connectors)
linear power supply: 12" (30.48 cm) x 3.25" (8.26 cm) x 4.25" (10.8 cm)
Net weight: with switching supply: 5.35 lbs (2.5 kg) - amplifier and external power supply)
with linear supply: 8.94 lbs (4.1 kg) - amplifier and external power supply)
Finish: Aluminum case w/ lexan top
Tube complement per channel: 12AT7/6201 input, 6SN7 or 12SN7 output