Anyone know the procedure for calibrating Alpha's "TUNE" LED meter function on
the 86, 89, or 87A? Three pots are used on the logic control board to
establish calibration. One sets the quiescent bias onto a comparitor for
mid-scale, while the other two establish gain for plate and cathode sampling.
Unfortunately, no info in the owner's manual on the calibration procedure and
the adjustments interact with one another. Tnx!
Paul, W9AC
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