WhitakerAudio JC Whitaker 20 W Stereo Integrated Audio Amplifier, Manual

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7) If any deviations from the expected values listed in Table 6.1 are observed, recheck wiring
and components for correct installation. Do not advance to the next step until the resistance
measurements are within tolerance.
8) Check the resistance between the output speaker terminals. The measurement should be
approximately 0.5
Ω
for each channel.
9) After the resistance checks have been successfully completed, powered measurements will
be taken.
10) Insert the rectifier tube, V51 (6CA4). Attach the ac power connector to the back panel
receptacle. Insert the ac power supply cord in an outlet. Switch the power on. The pilot lamp
V2, V5
6973
1 ~100 kΩ Varies due to filter capacitors in circuit
2 –
3 ~170 kΩ Varies due to filter capacitors in circuit
4 ~40 kΩ Heater
5 ~40 kΩ Heater
6 ~170 kΩ Varies due to filter capacitors in circuit
7 0 Ω
8 ~100 kΩ Varies due to filter capacitors in circuit
9 ~100 kΩ Varies due to filter capacitors in circuit
V3, V6
6973
1 ~100 kΩ Varies due to filter capacitors in circuit
2 –
3 ~170 kΩ Varies due to filter capacitors in circuit
4 ~40 kΩ Heater
5 ~40 kΩ Heater
6 ~170 kΩ
7 0 Ω
8 ~100 kΩ Varies due to filter capacitors in circuit
9 ~100 kΩ Varies due to filter capacitors in circuit
V51,
6CA4
1 50 Ω
2 – Not connected
3 ~100 kΩ Varies due to capacitors in circuit
4 ~40 kΩ Heater
5 ~40 KΩ Heater
6 – Not connected
7 50 Ω
8 – Not connected
9 – Not connected
Table 6.1 Typical Ohmmeter Readings with Power Removed and Tubes Removed