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 Post subject: Setting the PI Trimmer
PostPosted: Wed Apr 11, 2018 11:52 am 
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Holy Ghost
Holy Ghost
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Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7519
Location: Canada
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
OSD PI Trim.JPG [ 70.68 KiB | Viewed 4938 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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