Assembly Manual
DIGNA
Seite 2
Now check how the power supply
Connect the module to the supplied 12V power supply
and switch on. Now use a multimeter to measure the
voltage at the test points against TP GND:
A tolerance of 5% at the 12 V measuring points and
3% at the 64 V measuring point is in order.
If the voltages differ significantly more strongly, then
please check the assembly - also SMD - for any errors
or cold solder joints.
Do not continue as long as the power supply module does not work properly!
Now disconnect the 12V power supply and set aside the power supply module.
We will build an assembly aid for the mainboard
Pick up the black frame for the rear and the engraved silvery rear frame and peel off the
protective films. Carefully fit these two parts precisely to each other - note the drawing below
and that the rectangular cutout in the black frame has a greater distance at the top, but do not
yet press both parts firmly. Now take the black aluminium profile (a natural colored anodized
profile is used in this manual for the photos) and the four M3 x 10 Torx screws. Put the combined
rear frames on the profile and screw it tight. It might be that the U-profile is a little bit "bent" by
the casting process and you get it "in shape" by tighten the srews.
Next fit on the bottom of the aluminium profile the four black adhesive feet to the corners of the
large flat surface. Now slide the mainboard into the second groove from above as shown in
the picture.
We will start by assembling the CFM55 resistors. As you've already noticed, these brown
audio-grade resistors do not have a color code, but the resistance value is printed directly in
plain text.
However, this requires that the resistors must be bent in the way before fitting, that
their value is still readable from upside.
Otherwise, a later (hopefully not necessary) troubleshooting is almost impossible!
Start with the most common values, here with the 330R resistors. For non-taped (loose)
resistors, cut 2 cm from the wires before assembling. The resistance values which are printed
on the board should help you to find them.
When inserted into the profile, you will not find R11 and R31 (49.9k each) because they are
hidden by the profile. Therefore, put these two resistors aside. Next, when assembly of the
resistors is finsihed, fit the two tube sockets by first soldering the two outer pads (pins 1 and
9) from components side for fixation. Then pull the module out of the profile and assemble the
two remaining resistors R11 / R31 at the top right edge, the red WIMA capacitors, the two
1µF ceramic capacitors, the four 220µF polymer electrolytic capacitors (please keep a gap
of 0.5 mm to the PCB) and the two jumpers Z1-Y1 or Z2-Y2 if you use the supplied ECC8100
tubes.
50p
R
100p
200p
MM
CAPACITANCE
50p D VALUE OF DIP-SWITCH SETTINGS
INPUT IMPEDANCE MM = 47k MC = VARIABLE ON FRONT
DIY PREAMP KIT CAREFULLY
DESIGNED AND ASSEMBLED
L IN
GND
R
L OUT
PWR
12V 1A
INPUT SETTINGS
MC
GD
FOR MM
GD
MUST BE
set to ON
Do Not Open While Operational – No Servicing Parts Inside
IN GERMANY BY MR. NIXIE
