Moog Minimoog Model D User Manual page 27

MINIMOOG MODEL D OSCILLATOR TUNING PROCEDURE
A440
OSC 1 RANGE AND SCALE BOARD 1
NOTE: the following procedure uses headphones for the oscillator tuning. An audio amplification
system can be used for this instead of the headphones.
NOTE: Periodically check the tuning of the A-440 tuner. If it is out of tune, simply use the A-440 trim pot
to adjust it's tuning.
1. Set the A-440 switch to the ON position.
2. Set the Filter CUTOFF FREQUENCY control to the maximum position.
3. Set the Filter EMPHASIS control to the minimum position.
4. Set the LOUDNESS CONTOUR SUSTAIN LEVEL and DECAY TIME controls to their maximum positions.
5. Depress the highest "A" key on the keyboard, and adjust the OSC 1 RANGE trimpot for zero beats.
6. Depress the lowest "A" on the keyboard, and adjust the OSC 1 SCALE trimpot for zero beats.
7. Repeat steps 6 and 7 above until there are zero beats against the A-440 tone. Note that this process
may take several iterations.
8. Set the A-440 switch to the OFF position, but keep OSC 1 on.
OSC 2 RANGE AND SCALE BOARD 1
1. Set the OSC 2 VOLUME switch to the ON position.
2. Depress the highest "A on the keyboard, and adjust the OSC 2 RANGE trimpot for zero beats to OSC 1.
3. Depress the lowest "A" on the keyboard, and adjust the OSC 2 SCALE trimpot for zero beats to OSC 1.
4. Repeat steps 2 and 3 above until there are zero beats from OSC 2 to OSC 1.
5. Set the OSC 2 audio switch to the OFF position.
OSC 3 RANGE AND SCALE BOARD 1
1.
Set the OSC 3 VOLUME switch to the ON position.
2.
Depress and hold the highest "A on the keyboard, and adjust the OSC 3 RANGE trimpot for zero
beats to OSC 1.
3.
Depress and hold the lowest "A" on the keyboard, and adjust the OSC 3 SCALE trimpot for zero
beats to OSC 1.
4.
Repeat steps 2 and 3 above until there are zero beats from OSC 3 to OSC 1.
5.
Set the OSC 3 VOLUME switch to the OFF position.
OCT TRIM BOARD 1
1. Set the OSCILLATOR-1 RANGE rotary control to the 2' position.
2. Set the OSCILLATOR-2 RANGE rotary control to the 2' position.
3. Set the OSCILLATOR-2 VOLUME switch to the ON position.
4. Depress the highest "C" on the keyboard and hold.
5.Tune OSCILLATOR-2 to OSCILLATOR-1 with zero beats.
6. Set the OSCILLATOR-1 RANGE rotary switch to the 8' position.
7. Adjust the OCT Trim trimpot for zero beats.
8. Repeat as needed until both oscillators are in tune with each other at any setting of the RANGE controls.
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(Continued)
SCALE RANGE
OSC 1
OSC 2
OSC 3
OCT