MKTP-2 Class-T stereo Headamp,
Preamp and power amplifier
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Table of Contents
3.1 Connection
3.2 Operation
4.1 Specification of the Amplifier Unit
4.2 Specification of the Headphone Amplifier Unit
4.3 Specification of the Pre Amplifier Unit
4.4 Specification of the AC Adaptor
(for professional user only)
5.1 DC Bias Voltage Tuning
1. Introduction
Safety Guidelines
Thank you for your purchase of Miu-Audio MKTP-2 Class-T stereo Headamp,
Preamp and power amplifier.
Important safety instructions
Miu-Audio introduces the mini-size Class-T stereo amplifier MKTP-2 providing
up to 2x15W output with the bundled AC power supply unit. Thanks to the
Tripath's proprietary Class-T Digital Power Processing (TM) technology and
our special techniques in circuit design and component selection, MKTP-2
achieves the sound quality of high-end Hi Fi but in a very affordable price.
2. Features
This product is designed and manufactured to meet strict quality and safety
standards. However, you should be aware of the following installation and
operation precautions.
1. Take heed of warnings and instructions
You should read all the safety and operating instructions before operating this
equipment. Retain this handbook for future reference and adhere to all
warnings in the handbook or on the equipment.
Applied the proprietary T-amp technology for audiophile quality sound,
high power efficiency (90%) and less heat generation
Compact design (mini-size & light weight), easy portable and setup
Provide up to 2x15W output
An AC adaptor is bundled for continuous power supply.
Separated amplifier & AC adaptor design to minimize mutual interference
and flexible to apply other power sources, e.g. lead-acid battery.
2. Water and moisture
The presence of electricity near water can be dangerous.
Do not uses the equipment near water, for example next to a bathtub,
washbowl, kitchen sink, in a wet basement or near a swimming pool, etc.
through any openings. Liquid filled objects such as vases should not be placed
on the equipment.
Standard audio and speaker sockets compatible with most audiophile
quality cables.
It suppresses the "pop" sound when power on/off and also increase the
sound purity.
Built-in over-current protection.
Built-in over-temperature protection
Audiophile-graded parts and components
Air-core inductor used instead of magnetic-core for better sound
The stylish & specially-plated aluminum case provides not only
5. Ventilation
Do not place the equipment on a bed, sofa, rug or similar soft surface, or in an
good-looking, and also provides outstanding shielding capability.
enclosed bookcase or cabinet, since ventilation may be impeded. We
recommend a minimum distance of 50mm around the sides and top of the
3. Object or liquid entry
Take care that objects do not fall and liquids are not spilled into the enclosure
4. Placing the equipment
Only use a rack or shelf that is stable and strong enough to support the weight
of this equipment.
equipment to provide adequate ventilation.
6 Heat
Locate the equipment away from naked flames or heat producing appliances
such as radiators, stoves or other appliances that produce heat.
7 Climate
The equipment has been designed for use in moderate climates and in
domestic situations.
8. Cleaning
Unplug the unit from the mains supply before cleaning.
The case should normally only require a wipe with a soft, lint-free cloth. Do not
use chemical solvents for cleaning.
We do not advise the use of furniture cleaning sprays or polishes as they can
cause indelible white marks.
9. Power sources
Only connect the equipment to a power supply of the type described in the
operating instructions or as marked on the equipment.
The primary method of isolating Solo Mini from the mains supply is to use the
switch on the rear of the unit. Solo Mini must be installed in a manner that
makes disconnection possible.
15. Damage requiring service
The equipment should be serviced by qualified service personnel when:
A. the power-supply cord or the plug has been damaged, or
B. objects have fallen, or liquid has spilled into the equipment, or
C. the equipment has been exposed to rain, or
D. the equipment does not appear to operate normally or exhibits a marked
change in performance, or
E. the equipment has been dropped or the enclosure damaged.
Safety compliance
This equipment has been designed to meet the EOCENE 60065 international
electrical safety standards.
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) This device must accept any interference received, including interference
that may cause undesired operation.
10. Power-cord protection
Power supply cords should be routed so that they are not likely to be walked
on or pinched by items placed upon or against them. Pay particular attention to
the point where they exit from the equipment.
Due to the mains switch being located on the rear panel, the apparatus must
be located in an open area without anything obstructing access to the mains
11. Power lines
Locate any outdoor antenna/aerial away from power lines.
Mains plug/appliance coupler is used to disconnect device and it shall remain
readily operable.
12. Non-use periods
If the equipment is not being used for an extended period, we recommend that
you unplug the power cord of the equipment from the outlet, to save power.
13. Abnormal smell
If an abnormal smell or smoke is detected from the equipment, turn the power
off immediately and unplug the equipment from the wall outlet. Contact your
dealer and do not reconnect the equipment.
Correct disposal of this product
This marking indicates that this product should not be disposed with other
household waste throughout the EU.
To prevent possible harm to the environment or human health from
uncontrolled waste disposal and to conserve material resources, this product
should be recycled responsibly.
To dispose of your product, please use your local return and collection systems
or contact the retailer where the product was purchased.
14. Servicing
You should not attempt to service the equipment.
Contact your dealer to arrange servicing.
3. Overview
1. Volume Controller and Pre-Amp Power On/Off.
2. 3.5mm Headphone socket
3. Power Indicator
When plug in your headphone or MP3 into the mini jack (2), always plug in
a vertical way. NEVER shake the mini jack as this will permanently
damage the internal structure of the socket causing bad contact of signal.
4. Audio signal line output.
5. Audio input. The audio signal input (LEFT/RIGHT) connects from
audio source (e.g. CD player) to the amplifier by the RCA audio cable.
6. Power ON/OFF switches; pull up to power off the amplifier and pull
down to power on.
7. Power Supply Socket; Plug the bundled AC Adaptor to this socket to
supply power to this amplifier.
8. Speaker Output (RJ-45);
9. Audio signal line in.
10. Vacuum Tube (6922)
When plug in the supplied mini jack cable between 4 and 9, always plug in
a vertical way. NEVER shake the mini jack as this will permanently
damage the internal structure of the socket causing bad contact of signal.
3.1 Connection
4. Specifications
The mini series is easy to use product. Simply connect your source (CD
player, MP3 player, etc..) and speakers following below steps, you can enjoy
the high quality music in a second:
- Connect “Line Out” mini socket (4) to the “Line In” mini socket (9) using the
supplied mini jack to mini jack audio cable.
- Connect your CD player to the “Line In” RCA socket (5) using normal RCA
audio cable (not included)
- Connect your speakers to the included RJ45 – binding post adapter. Then
use the provided CAT-5 cable to connect the adapter to the RJ45 jack of
the amplifier (8)
- Connect the power adaptor to the “Power In” connector (7) of both units.
It’s now all set and you are ready to enjoy your music.
4.1 Specification of the Power Amplifier Unit
3.2 Operation
Power Efficiency
T-Amp IC Tripath TA2024
Output Power
2x15W @4ohm
2x6W @8ohm(RMS)
Signal-to-Noise Ratio (SNR)
Dynamic Range
IHF IM Distortion
THD+Noise Audiophile Quality
0.10% @ 1W, 4ohm
0.03% @ 9W 4ohm
0.1% @ 11W 4ohm
0.1% @ 6W 8ohm
10% @ 15W 4ohm
10% @ 10W 4ohm
High Power
81% @ 15W 4ohm
90% @ 10W 8ohm
Please follow the below steps such that you can enjoy the product without any
- Turn the “Volume controller” (1) clockwise to turn on the pre-amplifier and
keep the level at minimum. Now the vacuum tube (10) will slowly turn
on and you will see blue light from the top window. Wait for around 15
seconds to let the vacuum tube warm up to its operation temperature.
Turn on the power amplifier using the “Power” switch (6) at the back of the
unit. Now you can see the “Power Indicator” (3) turns to blue color.
Play your source equipment and you can hear music from your speakers.
Now, you can control the volume level by turning the “Volume controller” (1)
There is a “3.5mm Headphone socket” (2) in the front panel. You can
connect your headphone to the unit. Once your headphone is connected,
Input Audio
Power Socket
Speaker OUT
To turn off the amplifier, turn the “Volume controller” (1) to minimum level.
Then, switch off the “Power” switch (6) of the power amplifier. When the
“Power Indicator” (3) turn off, turn the “Volume controller” (1) to fully turn off
the pre-amplifier.
Volume & Knob Power ON/OFF switch x
Power Indicator
Power Supply
(Blue LED) x1
DC 12V-13.2V (max.)
4.2 Specification of the Headphone Amplifier Unit
Signal-to-Noise Ratio
Power Output
the speaker output will be disconnected automatically.
IN RCA (Left/Right) x 1
(5.5mm/2.1mm) x 1
RJ45 x1
(SNR) 92dB
3.0 Watts per channel on 33 Ohm
Frequency response
Input Impedance
Input Audio
15 Hz - 100 kHz -1db
10k Ohms
CD IN RCA (Left/Right) x 1 [3Vpp max.]
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4.3 Specification of the Pre Amplifier Unit
5. Technical Notes (for professional user only)
Vacuum Tube
Miu-Audio has already pre-set the jumpers and fine-tuned the DC bias voltage
of each MKTP-2 with the packaged vacuum tube before shipping. However,
changing different tubes to taste for different sound is the great fun for many
audiophiles and also a great feature of MKTP-2.
Signal-to-Noise Ratio (SNR)
THD + Noise
Input Audio
6DJ8/6922 series or 12AU7 series
0.05% @ 10k ohm 0.15% @ 33 ohm
CD IN RCA (Left/Right) x 1 [3Vpp max.]
Power Socket
Output Audio
(5.5mm/2.1mm) x 1
OUT 3.5mm x 1
OUT (3.5mm) x 1
Knob Audio and power switch x 1
Power Indicator
(Blue LED under Tube Socket) x1
Volume Knob x 1
Power Supply DC 12V-13V (max.)
There are some important notes should be aware before changing tubes.
MKTP-2 supports two major tube series:
(1) 6DJ8, 6922, 6N11, 6H23n, ECC88, E88CC, etc., and
(2) 12AU7, 5963, 5814, ECC82, etc.
If you change the tube within the same series, it needs to re-tune the DC bias
voltages ONLY.
Dimensions (W)76mm x (H)60mm x (D)100mm
If you change the tube from another series, it needs both to re-tune the DC
bias voltages and re-set the jumpers. Otherwise, the tube may be burnt out.
4.4 Specification of the AC Adaptor
AC Input Universal AC 100V-240V/50-60Hz
DC Output DC 12V 4A (48W)
DC Plug DC 2.1mm
Ripple & Noise <= 25mV
Over-load Protection 105%-150%
Over-voltage Protection 115%-150%
Dimensions (L)78mm x (W)50mm x (H)33mm
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The power amplifier jumper setting for Different Tube Series
You can simply configure the amplifier to support the two different tube series
by resetting the jumpers in J3, J4, and J5 in the PCB as shown in section 5.1.
(Remember to power OFF the machine before setting)
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6. Troubleshooting
5.1 DC Bias Voltage Tuning
Since each tube might derivate a bit in parameters, especially from different
series, it needs to re-tune the DC bias voltages to guarantee the machine is
working in the best point and performing the best sound quality.
There are two blue precise adjustable potentiometers (P1, P2) for tuning the
DC bias voltage of each channel. The DC bias has been tuned in factory. But
after run-in for a period or changed another tube, it would be deviated that the
fine-tuning is needed.
If your machine is out of order, it may not be very serious. Before you call your
local distributor or us to repair, you are suggested to check the following:
cannot power ON
power cords not properly properly
indicator not bright
power cords
power switch is OFF
switch ON the power
the volume level is too low
turn volume level higher
no sound at all
not properly
properly connected
Before you tune these, you need a screwdriver (take off the case), a small
screwdriver. (Turn the screw of the potentiometer) and a (digital) multi-meter
to detect the DC bias voltage:
the audio source (e.g. CD start playing the audio
player) not started playing
wrong input is selected
check input selection
properly connected
speaker cables
tube not fully pushed in
Insert Tube securely
audio connector plug not Insert plug securely
fully pushed in
sound out(s)
switch check the corresponding
input switch
loose connection
check input and output
connections. When all has
clockwise or anticlockwise until the voltage as close as to +6~+8V.
6. Then, repeat step 4 and 5 for the RIGHT channel by changing the test point
to A (R) [red] and turning the screw on the top of the P2 potentiometer.
7. Power OFF the amplifier.
8. Cover back the upper case and tighten the screws.
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audio cable
the speaker cables not properly
1. Use screwdriver to take out the two upper level screws in the front panel &
another two screws in the back panel. Then, open the upper case.
2. Power ON the machine with no audio signal input.
3. Wait at least 5 minutes for the machine to run in.
4. Use the multi-meter to detect the DC voltage between the test point A (L)
[red] in the PCB & the GND [black] (e.g. the ring of the power switch or the
outer ring of those RCA sockets) of the LEFT channel.
5. Turn the screw on the top of the P1 potentiometer by a small screwdriver
reduce volume and switch
unit back on
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7. Accessories
. 3.5MM jumper cable x 1
. RJ45 to speaker binding post adaptor x 1
. 2.1MM Power bifurcation line x 1
. Tube x1
. +12V power supply x 1
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