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4. ELECTRICAL ADJUSTMENTS
4.1.
Phono Equalization Amplifier Distortion
See Fig. 4.1.
R125
|Ri23
Fig. 4.1
4.2.
Tone Control Frequency Response
See Fig. 4.2.
Connect an oscillator to the aux, and an AC voltmeter to
the output terminal and depress the tone switch.
Set the bass and treble controls to ''flat'' (position "0"'),
balance control to the center position and contour control
to "0"
position.
Feed
in 1KHz
and adjust the volume
control to obtain 1V (for example) on the voltmeter.
Then feed in 30Hz and adjust VR603 and VR604 so as to
obtain a flat response for 1KHz.
cé601
R601
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