97
20 W Stereo Integrated Audio Amplifier
– Locate output the output transformers, T1 and T2. Install using the #6 hardware provided,
carefully guiding the leads through the holes in the chassis. Be sure to include the
grounding lug wires. Route the grounding wires through the chassis along with the
transformer secondary leads. The speaker leads (yellow, green, white, black) should face
to the rear of the chassis.
– Locate the power supply choke, L51. Examine the mounting holes. Note that two holes are
provided within the confines of the base of the choke. These holes are used for two of the
support standoffs for the power management PWB. Install the 2.5-inch standoff using
countersunk 3/8-inch long #6 screws. Include a lockwasher between the chassis and the
standoff. Tighten.
– Install the power supply choke using the #6 hardware provided, carefully guiding the leads
through the hole in the chassis. Be sure to include the grounding lug wire. Route the
grounding wire through the chassis along with the choke leads.
All of the transformers have now been installed.
5.5.6
Install Remaining Chassis Components
Locate the remaining chassis-mounted components, which include the following:
•
Panel-mount potentiometers R55 and R57
•
Top chassis decal
– Mount R55 –
100
Ω
potentiometer
– Hum Balance Control. Note the tab extending from
the component toward the front of the device. Using a pair of long-nose pliers, bend the
tab down to the base of the potentiometer. Place a large flat washer and lockwasher on the
shaft. Insert the device through the mounting hole. Note that R55 is located closest to the
back panel. Secure with a small flat washer and the large nut provided. Before tightening
the nut, orient the terminals so they are easily accessible from underneath the chassis; they
should point away from the preamplifier PWB. Be careful to not scratch the top-side finish
when tightening the nut. Once the device has been mounted, place the potentiometer in the
approximate center position using a common-blade screwdriver. The smaller-diameter nut
provided with the control is used to secure the position of the device to prevent accidental
movement. Place the locking nut on the shaft (finger-tight).
Содержание JC Whitaker 20 W Stereo Integrated Audio Amplifier
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