1. Calibrate GAIN and CV MOD Controls
Larry Hendry has a detailed procedure for adjusting the VCA so that the GAIN and CV MOD pots will match up with the front panel markings. I performed this procedure on two MOTM-110s and came up with the following values for R1, R5, and R26:
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VCA #1
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VCA #2
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R1
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48.2K
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49.1K
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R5
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57.5K
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55.2K
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R26
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38.4K
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40.6K
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I used 47K resistors for R1, 56K resistors for R5, and 39K resistors for R26 by measuring with a DVM and choosing the closest match from my stock of 5% resistors.
Larry Hendry's MOTM-110 tuneup procedure.
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