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4.3 Specification of the Pre Amplifier Unit
Vacuum Tube
6DJ8/6922 series or 12AU7 series
(exchangeable)
Signal-to-Noise Ratio (SNR)
92dB
THD + Noise
0.05% @ 10k ohm 0.15% @ 33 ohm
Input Audio
CD IN RCA (Left/Right) x 1 [3Vpp max.]
Power Socket
(5.5mm/2.1mm) x 1
Output Audio
OUT 3.5mm x 1
Headphone
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.)
Dimensions (W)76mm x (H)60mm x (D)100mm
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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5. Technical Notes (for professional user only)
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.
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.
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.
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)
