(3) Switch on
Diagram 3
To set speed place a record on the turntable and
then place the stroboscope on the record. Start motor.
Place pickup on record and turn the speed adjusting knob
until the ring of lines applying to that speed for which
you are setting appear to remain stationary when
illuminated under an appropriate A.C. light source.
Diagram 4.
For highly accurate transcription work where the
slightest speed deviation is critical it is desirable to let the
motor run for approximately 10 minutes so that it may
reach its normal working temperature. For such critical
work, speed should be re-checked on changing the speed
range.
9
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