7
Installation of Tubes, Tube Cover, Location and Ventilation
There are two different types of Small Signal Tubes
(12AX7A and 12AT7) used in each channel. Tube type can
be found on the outside of the Tube. The MC2102 will not
function if they are inserted into the wrong socket.
Small Signal Tubes:
1. Locate a 12AX7A Tube.
2. On the top left side of the amplifier, locate the Tube
Socket that has the nomenclature V1L 12AX7A next
to it on the chassis. Refer to figure 4 and 5.
3. Orient the Tube so that the area where no pins are
located on the base of the Tube is aligned with the
corresponding area on the Tube Socket.
4. Carefully insert the Tube into the socket until the base
of the Tube is fully seated in the Tube Socket.
5. Repeat the above steps for the remaining three
12AX7A Tubes.
6. Locate a 12AT7 Tube.
7. On the top left side of the amplifier, locate the Tube
Socket that has the nomenclature V3L 12AT7A next
to it on the chassis.
8. Insert the Tube, following the same procedures as in
steps 3 and 4.
9. Repeat the steps 6-9 for the remaining three 12AT7
Tubes.
Caution: To prevent electrical shock make sure that the
MC2102 Tube Cover is installed before connecting
the AC Power Cord.
Before operating the MC2102, locate the previously re-
moved Tube Cover and perform the following steps:
Installing the Tube Cover:
1. The Tube Cover has a wide opening along one side
of its longer dimension. Orient this wide opening so
that it is facing towards you.
2. Carefully place the Tube Cover onto the MC2102
while at the same time aligning the screws with the
openings on the MC2102 Chassis. Refer to figure 6.
3. Using an appropriate screwdriver secure the Tube
cover to the chassis, approximately five turns, do not
over tighten the screws.
Adequate ventilation extends the trouble free life of the
MC2102. The suggested minimum space for operating the
MC2102 is 24 inches (60.96cm) in width, 22 inches
(55.88cm) depth, and 22.5 inches (57.15cm) in height. Al-
ways allow air to flow through the ventilation holes on the
bottom of the amplifier and a means for the warm air to es-
cape at the top, refer to figure 7. For installation of the
MC2102 into a cabinet, refer to the next page.
Location and Ventilation
Warm Air
Cool Air
Figure 5
Figure 6
Figure 7
Tube Cover Fastening Screw Locations
Tube Cover
12AX7A
12AX7A
12AT7
12AT7
KT88/6550
