Installation of Tubes and Tube Cover
Caution: To prevent electrical shock make sure that the AC POWER CORD IS NOT CONNECTED TO THE MC2102 when inserting or removing Tubes, as there are hazardous voltages present at the pins of the Tube sockets.
Your MC2102 has gone through an extensive series of per- formance tests during the manufacturing process. The MC2102 is supplied with the actual Tubes that were used to test and confirm the performance of this amplifier. To protect the Vacuum Tubes from possible shipping damage, they are packed in four layers of foam and placed into the Tube Cover. It is secured to the MC2102 Chassis.
Note: Gloves or a soft cloth will prevent “fingerprinting” of the Tubes during their installation.
1.Orient the MC2102 so the Front Panel is facing you.
2.Using an appropriate screwdriver, rotate the two Tube Cover Screws counterclockwise, for approxi- mately five turns, until the Tube Cover can be re- moved from the MC2102 Chassis and the screws are still attached to the cover. Refer to figure 1.
3.Orient the Tube Cover to the wide opening along one side of its longer dimension. Refer to figure 2.
4.Remove the first layer of foam to expose the Tubes. Refer to figure 3.
5.Carefully remove the Tubes from the remaining pieces of foam and temporarily place them in a safe location.
6.Remove the remaining foam from the Tube Cover and retain all four pieces for possible future use.
The MC2102 Chassis has nomenclature screened on it to specify both the circuit location and Tube type for each channel, refer to figure 4.
Note: It is extremely important to insert the Tubes in the correct location.
Power Output Tubes:
1.Orient the Chassis so that the Front Panel of the Am- plifier is facing you.
2.Locate a KT88 or 6550 Power Output Tube.
3.On the top left side of the amplifier, locate the Tube Socket that has the nomenclature V7L KT88/6550 next to it on the chassis.
4.Orient the Tube so that the key on the base of the Tube is aligned with the corresponding key on the Tube Socket.
5.Carefully insert the Tube into the socket until the base of the Tube is fully seated in the Tube Socket.
6.Repeat the above the steps for the remaining 7 Power Output Tubes.
Tube Cover Fastening Screw Locations
Tube Cover
Figure 1
Tube Cover with Layers of Foam and Tubes
Figure 2
Power Output Tubes Small Signal Tubes
Figure 3
V7L KT88/6550 Tube
V1L 12AX7A Tube
Figure 4
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