Disconnect the preamplifier’s power supply ! from the AC power before working on the
unit.
To adjust the gain or loading of the phono stage, use the supplied 5/64" allen wrench to remove the six screws that secure the top cover. The two phono boards (one per channel) are mounted vertically on the right and left sides of the chassis.
Each phono board has two small brown terminal strips used to connect small metal-film resistors. The terminal strip towards the rear of the preamplifier is used to adjust the gain of the phono stage, while the terminal strip towards the front of the unit accepts the loading resis tor . The resistor leads are clamped by the two screws in the terminal strip, forming a gas-tight connection for optimum sound quality.
To remove the installed resistors, use a small flat-bladed screwdriver to loosen the two screws in the terminal strip until the screw heads are flush with the top surface of the terminal strip. Gently remove the resistor with a pair of tweezers or small needle-nose pliers.
To install the new resistors, use the tweezers or small needle-nose pliers to insert the two leads into the holes on the side of the terminal strip. Orientation is not important
— the resistor can be installed either way. Use the flat-bladed screwdriver to gently snug the two screws down. Do not overtighten them.
Do not operate the preamplifier without the ! gain-adjusting resistors installed.
Replace the top cover, reinstalling the six screws with the 5/64" allen wrench.