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AM/FM Stereo Tuner
5.3.6 Install Printed Wiring Boards
The following steps require patience. Do not force the boards and tube sockets into position, but
rather work them in carefully and slowly.
5.3.6.1 AM Tuner PWB
Locate the AM tuner PWB. Remove the screws that secure the sockets to the standoffs, and
remove the screws in the standoffs at the corners of the PWB (if present). Set these in a
convenient place.
Before installing the AM tuner PWB it will first be necessary to attach mounting lugs to C3,
the three-gang tuning capacitor. Examine the rear side of the capacitor. There are two sets of
holes, one near the top of the device and the other near the bottom. Use the bottom holes.
– Install a grounding lug to each hole using the #4 hardware provided (1/4-inch long screws
and captive lockwasher nuts). Tighten the screws against the nuts. The lugs should face
downward. Trim the eyelet off of the far end of each ground lug. Bend each lug upward in
a U fashion.
– Temporarily install C3 on the tuning shaft. Temporarily place the AM tuner PWB in
position in the chassis. The board will tend to drop into position as the tube sockets line up
with the chassis holes.
Note that depending on physical tolerances, C3 may extend by into the space occupied by the
PWB. If this problem is observed, shorten the shaft of C3 by a small amount (1/16-inch or so)
using a Dremel (or similar) tool. Be careful to keep the cuttings away from the plates of the
capacitor. Carefully inspect C3 after completed.
– Observe the
C3gnd
pads on the PWB. The lugs installed on C3 in the previous step should
extend through the pads. If the lugs do not line up correctly, remove the PWB and adjust
each pad as needed; then, check again. It may take several tries to get the lugs lined up
correctly.
– Temporarily tighten one of the set-screws from the front panel tuning control to the shaft
of C3. The position of the capacitor with regard to the front panel tuning knob is not
important at this time.
Summary of Contents for AM/FM Stereo Tuner 2012
Page 1: ...WhitakerAudio AM FM StereoTuner User and Assembly Manual...
Page 11: ...11 AM FM Stereo Tuner Figure 1 1 Schematic diagram of the AM tuner section...
Page 17: ...17 AM FM Stereo Tuner Figure 1 2 Schematic diagram of the FM tuner section...
Page 34: ...34 WhitakerAudio Figure 3 1 Component layout for the AM tuner PWB...
Page 36: ...36 WhitakerAudio Figure 3 3 Component layout for the FM tuner PWB...
Page 69: ...69 AM FM Stereo Tuner Set the FM tuner board aside it will be used later b...
Page 101: ...101 AM FM Stereo Tuner Figure 5 11 Chassis view of the AM FM Stereo Tuner...
Page 159: ...159 AM FM Stereo Tuner...
Page 160: ...WhitakerAudio AM FM StereoTuner...
