WhitakerAudio J C Whitaker 20 W Stereo Audio Amplifier, Manual

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20 W Stereo Audio Amplifier
The following components should be set aside for use in building the right channel speaker
terminal PWB:
• R13 – 8.2 k
Ω
, 0.5 W
• R14, R15 – 4
Ω
, 10 W
• R16, R17 – 27
Ω
, 2 W
• R47 – 5 k
Ω
, 0.75 W, potentiometer, trimmer
• R49 – 10 k
Ω
, 0.5 W
• R66 – 270
Ω
, 2 W
• R67 – 150
Ω
, 0.5 W
• C6 – 200 pF, 1000 V, ceramic or mica
• D1 – 1 A 600 V diode
• RYL1 – DPST 24 V dc relay with socket
• 5 quick-disconnect male terminals
• One 4-pin Molex housing/header, 0.1 pitch
• One 4-pin Molex housing/header, 0.156 pitch
• Speaker terminals PWB
If desired, a single light coat of acrylic conformal coating (MG Chemicals #419C-340G) may
be applied to the foil side of the amplifier and rectifier PWBs. Use masking tape to cover the face
of the tube sockets.
Assembly of the 20 W Stereo Amplifier PWB #1 (Right Channel) now been completed. The
finished board is shown in Figure 5.3. Check the PWB for proper installation of all components.
Look for bad solder connections or solder splash that might cause a short-circuit.
Set the amplifier and rectifier boards aside; they will be used later.