WhitakerAudio J C Whitaker 20 W Stereo Audio Amplifier, Manual

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This is best done by starting at pin 1 on one side of the socket, and on pin 9 on the other
side.
The final step in assembly of the amplifier PWB is to make the heater connections to the three
sockets on the board. The following procedure is recommended.
– Identify pins 4 and 5 on the tube sockets. These pins are used for the heater connections.
– Unscrew and remove the standoff adjacent to pins 4 and 5 on each socket. This will
facilitate access to the pins.
– Open the “Heater Circuit Wire” package; cut one 9-inch piece of #22 green wire and one
9-inch piece of #22 brown wire.
– Place one piece of heat-shrink tubing over one end of each wire.
( a ) ( b ) ( c )
( d )
Figure 5.2 Installation of sockets on the PWB: ( a ) mount the socket on the standoffs, ( b ) insert
connecting wires from the PWB to the socket, ( c ) board-to-socket connections completed, ( d )
finished job with heater wires installed.