Linear Tube Audio microZOTL User Manual Download Page 1

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USER GUIDE:

microZOTL Preamplifier

Linear Tube Audio

Takoma Park, MD, USA

301-448-1534

[email protected]

WARNING: For safety, the cover of this amplifier should be secured

at all times.

This amplifier contains extremely high voltages and the user should

not attempt to service the amplifier. Furthermore, this amplifier

generates radio-frequency energy that can interfere with

communications equipment.

Introduction

The microZOTL Preamplifier is a Class A tube preamplifier and

headphone amplifier utilizing ZOTL (Zero-hysteresis Output

Transformer-Less) technology. After years of refining and testing,

LTA has created the microZOTL Preamplifier. This is the highest

expression of the microZOTL circuit as both preamp and

headphone amp in a rack-friendly form factor.

Summary of Contents for microZOTL

Page 1: ...e amplifier Furthermore this amplifier generates radio frequency energy that can interfere with communications equipment Introduction The microZOTL Preamplifier is a Class A tube preamplifier and head...

Page 2: ...from careless use 4 The warranty is void if the serial number has been removed altered or defaced 5 This warranty is void if improper voltage is applied to any input or output 6 If Linear Tube Audio...

Page 3: ...mpedance 50 Ohms Gain 10 3dB 4 Ohm load 12 4dB 8 Ohm load Noise 90dB Frequency Response 1dB 10Hz 20kHz 4 Ohm Load 1dB 5Hz 50kHz 8 Ohm Load THD 1 Power consumption 33W Input Voltage with SMPS Universal...

Page 4: ...our preamplifier via the power button on the front panel The buttons are capacitive so you only need to touch them they do not push in There is a turn on delay of several seconds to allow the unit to...

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Page 6: ...option the XLRs are wired as single ended inputs with the negative signal voltage tied to ground Though there is voltage loss using the XLR inputs with a balanced source may sound better than using th...

Page 7: ...they scroll up and down Left and Right Buttons Unused unless activated in the menu to function as Balance control or input selectors In the Menu they act as selectors Center Button Mute When the unit...

Page 8: ...saved and recalled upon power on Home Theater Input Home Theater Input locks a selected input at a fixed volume level to allow external volume control Select the input desired to have a fixed volume...

Page 9: ...also use 6SN7 tubes These are identical sonically they simply use different voltages for the heater When switching from one to the other be sure to set the jumpers on the boards to the correct positio...

Page 10: ...esign the tube socket is very secure We have heard no reports of any trouble using equivalents of 6SN7 12SN7 or 12AT7 tubes For lower gain and a more laid back sound you can substitute 12AU7 tubes for...

Page 11: ...NOTES...

Page 12: ......