WhitakerAudio J C Whitaker 20 W Stereo Audio Amplifier, Manual, Page: 117 / 194

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20 W Stereo Audio Amplifier
transformer base). Attach a Molex terminal (0.156 pitch) to the end of each lead. Insert the
wires into a 4-terminal 0.156 pitch Molex housing as follows:
• Black wire to pin #1
• Green wire to pin #2
• Yellow wire to pin #3
• White wire to pin #4
– Find the secondary leads from the left channel output transformer (T2). Trim the leads to
be about 3-inches beyond the expandable sleeving (approximately 8 inches total from the
transformer base). Attach a Molex terminal (0.156 pitch) to the end of each lead. Insert the
wires into a 4-terminal 0.156 pitch Molex housing as follows:
• Black wire to pin #1
• Green wire to pin #2
• Yellow wire to pin #3
– White wire to pin #4
5.6.11.2 Speaker PWB Assembly
Find the speaker terminal PWBs. Two are provided—one for the right channel and one for the left
channel. Each board mounts on the speaker terminals for the respective channel.
Temporarily fit each PWB on to the speaker terminals. The board should fit tightly over the
posts. Upon completion the boards will be soldered to the posts. Note that it may be necessary to
trim the end points of the posts in order to provide for a good fit with the boards.
Remove the boards from the chassis and perform the following steps.
– Using the technique shown in Figure 5.1, mount the 5 quick-disconnect posts on the right
channel speaker PWB. Solder.
– Using the technique shown in Figure 5.1, mount the 5 quick-disconnect posts on the left
channel speaker PWB. Solder.
– Install R13 – 8.2 k
Ω
, 0.5 W – on the right channel speaker PWB. Solder in place.
– Install R30 – 8.2 k
Ω
, 0.5 W – on the left channel speaker PWB. Solder in place.