WhitakerAudio J C Whitaker 20 W Stereo Audio Amplifier, Manual

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– Twist the wires together and route to socket V3 (see Figure 5.2 d for placement). The wires
should be placed at socket-level. Do not dress the wires against the PWB.
– Trim the wire lengths as needed to comfortably reach V3. As before, slip a piece of heat-
shrink tubing over each wire. Crimp the brown wire on pin 5, and then crimp the green on
pin 4. Do not solder.
– Cut one 9-inch piece of #22 green wire and one 9-inch piece of #22 brown wire. Slip the
brown wire through the heat-shrink tubing on the lead already connected to pin 5 of V3.
Route the wire to the pin and crimp in place. Solder, keeping the heat-shrink tubing away
from the hot wires and the soldering iron. Slip the green wire through the heat-shrink
tubing on the lead already connected to pin 4 of V3. Route the wire to the pin and crimp in
place. Solder, keeping the heat-shrink tubing away from the hot wires and the soldering
iron.
– Slide the heat-shrink tubing into position at the base of the socket. Apply a stream of hot
air to shrink the tubing over the pins. Be careful to not use too much heat.
– Replace the standoff removed from the V3 socket. The screws should be finger-tight.
Remember to include the lockwasher on the component side of the board. The heater leads
should straddle the standoff.
– Twist the wires together and route to the 6V heater pads on the PWB (see Figure 5.2 d for
placement). The wires should be placed at socket-level. Do not dress the wires against the
PWB.
– Trim the wire lengths as needed to comfortably reach the pads on the foil side of the
board. Insert the green wire into the 6V heater pad adjacent to the 6VH1 post. Solder from
the component side of the board. Insert the brown wire into the 6V heater pad adjacent to
the 6VH2 post. Solder from the component side of the board.
– Mount relay RYL51 using the #4 hardware provided. Be careful to not over-tighten the
mounting nuts. The tabs on the relays are somewhat brittle and can break under excessive
pressure.
– Find tubes V1, V2, and V3. Set them aside in a safe place. The tubes will be installed
during the final checkout process. Be very careful when handing the tubes.