AYRE K-3 - Manual (Page 14)

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 phono board is horizontally
mounted and located toward the right side of the chassis.
The phono board has two small brown terminal strips per
channel used to connect small metal-film resistors. The
terminal strips towards the front of the preamplifier is used
to adjust the gain of the phono stage, while the terminal
strip towards the rear of the unit accepts the loading
resistor. 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.
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