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Connecting the shielded cables
This process will be done twice, once for the right channel, and once for the left.
1.
Solder the drain wire from the volume control shielded cable to the unpopulated
INGND hole on the PCB. Cover the drain wire using a bit of the gray jacket from
the shielded cable.
2.
Unsolder the existing red wire from the PCB IN terminal.
3.
Twist and solder the just disconnected red wire to the red wire from the volume
control shielded cable. Wrap the connection with a piece of electrical tape.
4.
Solder the black wire from the volume control shielded cable to the IN terminal of
the PCB.
Repeat the above process for the other channel.
Final Assembly
Check your work for the absence of solder bridges and the presence of good connections.
Reinstall the top and the 11 screws that hold it in place.
Specifications and a Usage Note
The input impedance of the amplifier with the volume control will be about 10 K Ohms.
This is lower than the typical power amplifier’s input impedance (around 50 K Ohms).
Still, it’s high enough not to cause a problem with 99.49% of existing equipment.
Installing the volume control in the GT-102 enables direct connection of a CD player, or
other high-level output device, directly to the GT-102. Doing so minimizes the amount of
electronics between you and the sound, maximizing the potential fidelity of your system.
