111
20 W Stereo Integrated Audio Amplifier
– Find
VR54
, 130 V MOV. Place a 1-inch long piece of insulation on each lead (use
insulation stripped from a length of #18 black hookup wire). Attach a quick-disconnect
terminal to each lead. Connect one lead to
N-6
on Amplifier PWB #1 (right channel).
Connect the other lead to the
Hot-6
post on Amplifier PWB #1. Orient the device so it is
horizontal.
The primary power connections have now been made. Recheck your work. The chassis at this
stage of assembly is shown in Figure 5.11.
5.5.10 Chassis-Mounted Controls
In the following steps, the Hum Balance and Bias Adjust potentiometers will be connected.
Terminal numbering for the chassis-mounted potentiometers is shown in Figure 5.12.
– Prepare two 16-inch long #22 wires, one brown and one green. Twist along the length of
the wires, leaving about 2-inches free on each end. Attach quick-disconnect terminals to
each wire at one end.
– Connect the brown wire terminal to the
R55a
post on the left channel PWB.
– Connect the green wire terminal to the
R55b
post on the left channel PWB.
– Using the available cable clamp, route the green/brown twisted pair to Hum Balance
control R55, which is located at the rear of the chassis, adjacent to the back panel. Trim
the wire lengths if needed. Secure the brown wire to terminal
#1
of
R55
. Solder in place.
Secure the green wire to terminal
#3
of
R55
. Solder in place.
– Prepare a 16-inch long #22 orange hookup wire. Install a quick-disconnect connector on
one end of the wire. Attach to the
R55arm
post on the left channel PWB. Route the other
end of the wire through the available cable clamp to R55 at the rear of the chassis. Trim
the length if needed. Secure to the wiper arm of Hum Balance control R55 (terminal 2).
Solder in place.
– Prepare one 18-inch #22 violet wire. Install a quick-disconnect connector on one end.
– Connect R57a – R57 high terminal. Attach the #22 violet wire prepared in the previous
step to the
R57a
post on the left channel PWB. Route the other end of the wire through the
Summary of Contents for JC Whitaker 20 W Stereo Integrated Audio Amplifier
Page 1: ...20 W Stereo Integrated Amplifier WhitakerAudio 20 W Stereo Integrated Audio Amplifier ...
Page 11: ...11 20 W Stereo Integrated Audio Amplifier Figure 1 1 b ...
Page 16: ...16 WhitakerAudio Figure 1 2 b ...
Page 20: ...20 WhitakerAudio Figure 1 3 Power management circuit for the 20 W integrated stereo amplifier ...
Page 38: ...38 WhitakerAudio Figure 3 1 Component layout for the Amplifier PWB 1 right board ...
Page 40: ...40 WhitakerAudio Figure 3 2 Rectifier PWB component layout ...
Page 45: ...45 20 W Stereo Integrated Audio Amplifier Figure 3 4 Layout of the speaker terminal PWB ...
Page 84: ...84 WhitakerAudio Figure 5 6 Power management PWB a component side b foil side a b ...
Page 188: ...20 W Stereo Integrated Amplifier WhitakerAudio 20 W Stereo Integrated Audio Amplifier ...
Page 196: ...196 WhitakerAudio ...
