However, you really do need to get the very low octave tuned first (steps 1 and 2), so you really do need a frequency meter for that. If you don't have a frequency meter, then pick a note (say, A or C) and use your guitar tuner or MOTU or whatever. Just follow these instructions to the letter. Yes, that is exactly how we have calibrated several hundred Rubicons and about 1,000 Dixies. This may take many interations! The more you do the more perfect tuning will be. Adjust HFBIAS until you have close to this (4088 to 4100Hz is fine) Goal should be about 511.00Hz to 511.7Hzįrequency should ideally be 4096Hz. Adjust HFGAIN until it s much closer to 512. Go back to Step 1 and keep repeating 1, 2 until the octaves are perfect (8.00Hz 16.00Hz)įrequency will be close to 64Hz but you should adjust Coarse/Fine until it is exactly 64.00Hzįrequency should be 512Hz. If sharp, adjust CVGAIN to make it SHARPER If flat, adjust CVGAIN to make it FLATTER Symmetry should be at full CW.Īdjust frequency via coarse and fine to 8.00Hz (read from triangle output) Voltage Source (VS) is your octave generator plugged into 1V/Oct input. You should never attempt to calibrate any VCO before about 15 minutes of ON time. Here's a response from David Dixon (dr etch-and-sketch)gave on this forum on calibrating Dixies and Rubicans a year or two ago that I copied:
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