In the manual, we recommend setting the trim pot to the center position, but also talk about adjusting for maximum bloom. Here is a method for attainingthat.
Use an insulated adjustment tool and be very careful of high voltages.The objective it to set the trimmer for a approximate 6.5 - 7 volt difference Pin 1 with the higher plate voltage.
Set the amp clean (no boost , no mid boost, no overdrive, no bright) with all the appropriate controls at noon.
Use a neutral sounding guitar on both pickups with it's volume(s) and tone(s) on 10. Without finger vibrato lay these single notes on the 3rd,4th,5th frets of the B string - a D, E flat E.
Let each ring out before playing the next one. In an ideal world they should all bloom equally. If the E blooms but not the D move the trimmer to make the input side lower by a half a volt.
Fine tune to taste by ear. Most of the time the 6.5V is good.
Attachment:
OSD PI Trim.JPG [ 70.68 KiB | Viewed 9795 times ]
Another way is to set the trimmer at halfway as in manual, set up the controls as above, and then move it Clockwise / Anti-Clockwise looking from the rear, in small increments while strumming a chord with some nice harmonic content. See if there's a position that makes the chord and then notes ring longer/better. It's all pretty subjective.
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