WhitakerAudio JC Whitaker 20 W Stereo Integrated Audio Amplifier, Manual

Page: 58 / 196

58
WhitakerAudio
– Install C52 – 82 µF, 500 V electrolytic . Solder in place. Be certain to observe proper
polarity.
– Install C54 – 10 µF, 100 V electrolytic . Solder in place. Be certain to observe proper
polarity.
Clean the soldering iron tip.
– Install TB3 , the four-terminal Molex barrier strip. Solder in place.
– Find tubes V1, V2, and V3. Set them aside in a safe place. The tubes will be installed
during the final checkout process.
– Mount the two 4 terminal Molex contact headers at the Conn1 and Conn2 positions.
Solder in place. It may be necessary to hold the header in place from the component side
of the board until the first terminal is soldered.
– Mount the ten standoffs on the foil side of the amplifier board using the 4-40 hardware
provided. Use a lockwasher on the screw head (component side) of the board. Standoffs
are positioned at the four corners of the PWB and on each side of each tube socket. For the
standoff on the corner of the board adjacent to the GND terminal, use a #4 ground lug in
place of the lockwasher.
– Mount the six standoffs on the foil side of the rectifier board using the 4-40 hardware
provided. Use a lockwasher on the screw head (component side) of the board. Standoffs
are positioned at the four corners of the PWB and on each side of the tube socket. For the
standoff on the corner of the board adjacent to the GND terminal, use a #4 ground lug in
place of the lockwasher.
In the following steps the tube sockets will be installed and connected. These steps will
require a considerable amount of time and patience. Successful completion is critical to proper
operation of the amplifier.
– Mount the three sockets on their respective standoffs on the amplifier PWB. Pin 1 of the
socket can be identified by a number stamped on the bottom side of the socket. Pin 1 on
the PWB is identified by a square pad. Place the socket in the proper orientation over the