Musical Paradise MP-D2 MK3 Specification sheet

MP-D2 MK3 DAC Quick Setup Manual
Faceplate
1. Power button is on the most left hand side.
2. Variable button controls either fixed line level output or variable preamp
output. When variable light is on, preamp output is active. Volume can be
adjusted by the volume pot on the right of the faceplate. When variable light
is off, fixed RCA and XLR outputs are active. Preamp output is disabled.
3. Input source button chooses an input source which can be USB, coaxial,
AES or optical.
4. DSD ON light is turned on automatically when playing SACD DSD file over
USB connection.
Rear Panel
1. Variable RCA output is preamp output which is used to connected power
amp or active speakers. It can provide up to 8V RMS output signal.
2. Fixed outputs section includes fixed line level single ended RCA outputs
and XLR balanced outputs. They are used to connect integrated amplifiers or
pre-amplifier. When using RCA outputs, both gain switches should be set to
L position. When using XLR outputs, both gain switches should be set to H
position.
3. Inputs section includes AES，COAXIAL，TOSLINK OPTICAL, and USB input
port. The switch selects external clock or internal clock for USB input only.
The default setting is internal clock. An external 22.5792Mhz / 24.576Mhz
3.3V external clocks are supported.
Internal
1. V1, V2, V3, V4 are output signal tubes which can be 6N11，6H6，6H30，
E88CC，6922，6DJ8，12BH7，12AU7 and E80CC tubes. When using 6N11，
6H6，6H30，E88CC，6922 and 6DJ8 tubes，switch S1 on the right corner of the
mother board must be set to 6.3V filament voltage position. When using
12BH7，12AU7 and E80CC tubes, switch S1 must be set to 12.6V filament
voltage position.
2. If you use RCA outputs only, when upgrading signal tubes, only V1 and
V3 need to be upgraded, V2 and V4 can use existing ones as long as the

filament voltages are the same. For example, V1 and V3 use E88CC，V2 and
V4 use Russian 6H6. V1 and V3 use 12BH7, V2 and V4 use Shuguang 12AU7.
These combinations can significantly lower the upgrade cost if you only use
RCA outputs. Remember, 4 tubes are always required. Do not just run with
2 tubes.
3. If you use RCA output only, when upgrading output coupling caps, you
just need to change C53 and C64, do not need to change C57 and C65, C57
and C65 can also be removed if you need more space for C53 and C64.
4. If you need to use XLR outputs, V1, V2, V3, V4 tubes and C53，C57，C64，
C65 capacitors must be the same brand and same model. Tubes need to be
matched.
5. Output coupling capacitors voltage must be at lease 400V or up;
capacitance must between 1uf and 4.7uf. Stock one is 630V 2.2uf.
7. P3 location is a rectifier tube. 5R4, 5AR4, 5U4G, 5Y3, GZ34, 274B, GZ37,
5BC3(with adapter) are supported 5V filament rectifier tubes. 6Z5P (stock)
and 6X5 are supported 6.3V filament rectifier tubes. When using 5V rectifier
tubes, toggle S2 switch beside P3 socket to 5AR4 position. When using 6.3V
rectifier tubes, it must be set to 6X5 position.
Caution：When changing signal and rectifier tubes, before powering on,
please double check to confirm the model is supported, and the filament
voltage(s) are set properly. Tubes are aligned and plugged into the sockets
securely. Fail to do so, might cause damage to the tube(s) and/or the DAC.