WhitakerAudio JC Whitaker 20 W Stereo Integrated Audio Amplifier, Manual

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WhitakerAudio
5.5.5 Install Transformers
The chassis is shipped with the output transformers and power supply transformers packaged
separately. This is a precaution to avoid damage during shipping due to the weight of these
components. As the transformers are installed, the chassis will become quite heavy. Use the side
handles to move the chassis. It may be useful to have a second person assist during the following
steps.
In order to reach the PWB terminal posts, the lead length on the transformer wires is critical.
As typically supplied, the leads should reach their respective posts. To avoid the possible need to
extend one or more of the leads, do not trim the wires from the transformers until they are to be
connected to the PWBs.
– Locate the chassis grommets. There are 5 for the 1/2-inch holes and 2 for the 3/4-inch
holes. Install the grommets.
– Examine the transformers (T1, T2, T51, and L51). A nameplate sticker can be found on
the bottom of each device. Carefully peal off the sticker and apply it to the under-side of
the chassis in the approximate location of the transformer. This will serve as a reference
for connections, and service at a later point if needed.
– Locate the power transformer, T51. Examine the mounting holes. Note that two additional
holes are provided within the confines of the base of the transformer. These holes are used
for the support standoffs for the power management PWB. Install the 2.5-inch standoffs
using countersunk 3/8-inch long #6 screws. Include a lockwasher between the chassis and
the standoff. Tighten.
– Install power transformer T51 using the #6 hardware provided. Carefully guide the leads
through the holes in the chassis. Be sure to include the grounding lug wire. Route the
grounding wire through the chassis along with the transformer leads. The filament leads
(yellow and green) should face to the rear of the chassis.
For transformer installation, the sequence of #6 mounting hardware is as follows (from top to
bottom): screw / flat washer / transformer mounting tab / external tooth lockwasher / chassis / nut
with captive lockwasher. For the mounting position that includes the ground lug, insert the lug in
place of the external tooth lockwasher.