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Alembic Club » FAQ & Must Reads » FAQ » Information Related to All Instruments » Trimpots, or Adjusting Gain, or The Blue Square with a White Circle « Previous Next »

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Username: mica

Post Number: 3039
Registered: 6-2000
Posted on Thursday, February 02, 2006 - 3:03 pm:   Edit Post

For single preamp models (Excel, Epic, Orion, Essence) the trimpot for gain adjustment is located on the filter board:

Orion trimpot location

For models with 2 preamps (Europa, Rogue, Distillate, Spoiler) the trimpots for each channel are located on the main board:

2 channel

Series I and II trimpots are accessable thru the backplate.
Username: davehouck

Post Number: 3132
Registered: 5-2002
Posted on Friday, February 03, 2006 - 5:40 pm:   Edit Post

The trim pot does not change the tone coming from the instrument; it only changes the amount of signal.

On models with a single trim pot, the pot provides a couple of useful functions. Some amps just don't like a lot of input; so if your instrument is causing your amp to clip, you can back the trim pot off a little until the clipping ceases. If your switching instruments between songs at the gig, you can use the trim pot to adjust the output of the Alembic to match the output of the other instruments, thus avoiding an unexpected change in stage volume.

On instruments with two trim pots another useful function is available. You can use the trim pots to adjust the outputs of the pickups relative to each other. For instance on an instrument with a pan control, you may want to have the center detent postion actually have more bridge pickup than neck pickup.

The trim pot is easily adjusted with a small flat blade screw driver.

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