Linear Tube Audio MZ3 Manual de usuario

USER GUIDE: MZ3

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 MZ3 is a Class A tube amplifier utilizing ZOTL (Zero-hysteresis

Output Transformer-Less) technology. The MZ3 represents several

years of research and listening in order to significantly improve on

both the original micro-ZOTL designed by David Berning in 1999

and the MicroZOTL2.0 (now the MZ2) released by LTA in 2015.

Limited Two-Year Warranty*

1. Your new product is covered by a limited two-year warranty

against defects in material and workmanship. Any repairs

required will be made at no charge within the first two years after

purchase as a new unit.

2. Any units returned for warranty repair must be shipped prepaid

after receiving return authorization. If possible, the unit should be

shipped in its original packaging. If this is not possible, the unit

should be well packed with particular attention paid to protection

of all corners and avoidance of any looseness in the carton.

3. This warranty does not apply to damage resulting from physical

abuse or unauthorized alterations or repairs, or from tube rolling or

adapter use, or from the use of third-party components, or

damage to exterior finish resulting 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 determines after receiving the unit that

damage was misrepresented and has been caused by something

not covered by the warranty, the customer must pay for any

necessary repairs before the unit is returned to the customer.

7. Linear Tube Audio reserves the right to improve or change its

products without obligation to modify previously manufactured

units.

* Applicable for domestic sales only. There is a one year warranty

for overseas customers. Handling and shipping costs are the

responsibility of the overseas customer.

Service Note

ZOTL amplifiers use a unique circuit and even trained technicians

familiar with tube amplifiers may not know how to correctly work

on LTA products. Please contact us before attempting any

alteration or repair, whether you are concerned about the

warranty or not.!

Specifications

Circuit Type: Push-Pull Class A

Power Output: 1W (4 Ohm), 0.5W (8 Ohm)

Input Sensitivity: 0.6V RMS for full output

Input Impedance: 50K

Output impedance: 2 Ohms (measured at 0.5A, 60 Hz)

Preamp Output Impedance: 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: 110/220 Selectable

Tube Complement: (2x) 12AT7, (2x) 6SN7/12SN7

Size: Amplifier: W: 10” (25.5cm), H: 4.75: (12cm), D: 8.5” (18cm)

PSU: W: 5.25” (13.5cm) H: 4.25” (11cm) D: 12.25” (31cm)

Weight: Amplifier: 7 lbs (3.2 kg),

PSU: 5.2 lbs (2.35kg)

Shipping Weight: 17 lbs (7.7kg)

Quick Start

Remove amplifier, power supply, and included cables from the

box.

Attach the DC umbilical cable to the power supply and amplifier.

This has a 4-pin XLR on each side - make sure these are securely

attached.

Attach the power cable to the IEC connector on the power

supply, and plug into an outlet.

Hook up your sources as well as your power amp, if using the MZ3

as a preamp.

Once your system is set up and everything is hooked up, turn on

your system.

Operation

The unit is designed to be powered on indefinitely without harm.

You can also safely leave only the power supply on, using the

power button on the front panel to turn the amplifier on and off.

While it does not generate much heat, the unit is air cooled and

should be placed somewhere with adequate ventilation.

There are 3 RCA pairs on the back for 3 inputs, selectable via

toggle switch on the front panel.

The 2 RCA pairs next to the speaker binding posts are for the

preamp output. While the headphone and speaker outputs are

identical, the preamp output is optimized for preamp use and has

a higher output impedance. Both preamp outputs are identical.

The binding posts for the speakers can be used with banana plugs,

spades, and bare wire. We recommend using very sensitive

speakers (at least 98dB) if you want to utilize the MZ2 as a speaker

amplifier.

User Interface and Controls

The front panel features a power switch, input switch, volume

knob, and display. The remote control is able to adjust volume,

mute, and access a menu with more configurable options.

Remote Control

Up and Down Buttons: These normally function as Volume Up and

Volume Down. They can be held down or used in a single step

mode. In Menu mode, they function to move up and down in the

menu as displayed on the operator display.

Left and Right Buttons: In normal operation these are not active.

They can be configured in the “L-R Remote Arrows” Menu to

function as the Balance control. In the Menu mode, they act as

selectors.

Center Button: This normally functions as a Mute function. When

the unit is muted, there are two Xs on the display. When in Menu

Mode, the Center button functions as a Select button.

Menu Button: When in normal operation, selects the Menu Mode.

In the menu, this functions as a Select button.

Play/Pause Button: This is only used to pair a new Apple remote to

the unit, which is done by holding the button down for 30 seconds.

The menu is accessed via the Menu button on the remote control.

Scroll with the up and down buttons to see menu options. Pause

on an option to see the entire title scroll by.

Balance: Use the right and left remote buttons to adjust the

balance. The front panel displays the balance setting as you

adjust - two bars in the center indicate that the balance is at 0

(both channels are equal). Press the center button to save the

setting. The display will indicate which setting the balance has

been set to. The balance setting is saved across all inputs. The

maximum balance setting is 16 levels difference.

Brightness: The front panel display can be set to 16 levels of

brightness. The brightness levels are saved and recalled upon

power on.

Display Timeout: The volume display and input LEDs can be set to

turn off after 10 seconds. They will reappear if a button on the

remote control is pressed or the volume knob or front panel switch

is changed. There are 3 settings:

OFF - The volume display and input LEDs remain on.

VOL - The volume display turns off but the input LEDs remain on.

ALL - The volume display and input LEDs turn off.

L-R Remote Arrows: There are two functions that can be selected

for the Left-Right Arrow buttons as follows:

Off – the remote Left-Right arrow buttons are deactivated.

BAL – the remote Left-Right arrow buttons will control the balance.

Power-On Override: When activated, the unit powers on when the

AC power is turned on without needing push the front panel

power button.

Reset to Default: The amplifier controls are set to Balance = 0,

Display Timeout = Off, Home Theater Mode = None, and Display

Brightness = 8, and Remote Left-Right Arrow buttons set to Not

Active.

Tube Heater Voltage Jumper Settings

The MZ3 comes with selected

old-stock 12SN7 tubes as its

standard output tubes. By

changing the jumpers on the

circuit board, the amp can 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 position. A 6-volt

tube like the 6SN7 will burn out

quickly if given 12 volts.

On the circuit board, there are

two headers next to each other,

for a total of 4 pins. There is a small diagram showing the correct

way to orient the jumpers. When using only a single jumper in 6V

operation, there is a header labeled “park” where you can store

the extra jumper.

To use 6SN7s, set the jumpers to 6V by placing a single jumper

across the center two pins. To use 12SN7s, set the jumpers to 12V

by using two jumpers, covering all 4 pins.

Tube Replacement/Rolling: The amplifier operates the tubes in a

manner that maximize tube life and the tubes are expected to last

over 10 years of regular use. The sockets are tight, so gently rock

the tube pins until you are able to remove the tubes. We use high-

quality ceramic tube sockets with gold pins which are designed in

such a way that the white ceramic part may shift slightly. This is an

intentional design; 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 the 12AT7s. Do not use

12AX7s. When replacing the tubes, use matched pairs.

Fuses: The MZ3 has a fuse on the audio board and two fuses in the

LPS+. All are 5x20mm. There is a 2.5A Fast Blow fuse on the audio

board there are two 4A Slow Blow fuses in the IEC inlet of the

Power Supply.

For more information and FAQs, please visit

www.lineartubeaudio.com or contact us at

[email protected].

NOTES

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