WhitakerAudio 60 W Stereo Power Amplifier, Руководство пользователя и по сборке

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operating conditions; they are not sized to run for extended periods at the higher potential
experienced during this test.
Warning : Do not let the amplifier run under a no-tube condition any longer than necessary to
make the measurements detailed in Table 6.3. Long-term operation with the amplifier tubes
removed can damage resistors R56 and R57.
31) Using extreme caution, check for proper voltages at the tube connection points listed in
Table 6.3. All voltages are measured with respect to ground using a high impedance
voltmeter. Variations within ±10 percent are typical with an ac input voltage of 120 V ac.
These measurements can be taken from the top of the chassis by probing into the socket
connection points. Take measurements on the right channel and then the left channel.
Table 6.3 Typical Voltmeter Readings with all Tubes Removed (Except V51) and
Power Applied
Tube Pin No. Typical Reading Notes
The following readings are with a B+ supply voltage of 540 V dc.
V1, 6U8A 1 540 V
2 0 V
3 0 V
4 35 V Heater
5 35 V Heater
6 530 V
7 0 V
8 0 V
9 530 V
V2, 7027A 1 540 V
2 35 V Heater
3 540 V
4 540 V
5 –40 V
6 –40 V Same as pin #2
7 35 V Heater
8 0 V