ODS PI trim pot adjustment help

drew.12345
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ODS PI trim pot adjustment help

« on: January 30, 2010, 02:13:07 AM »

Hi,
I am the proud owner of an Overdrive special w/ mercury irons. I'm new to the forum but couldn't find a lot of info on the PI trim pot. I had my local amp tech check out my build and hey ok'd it but I am not sure if he noodled with the PI trim pot at all. Does any one have any recommended setting before I start messing with it? or any ideas of where it should be? Right now its sitting at around 12'o'clock.

Thanks


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bluesfendermanblues
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Re: ODS PI trim pot adjustment help

« Reply #1 on: January 30, 2010, 08:25:04 AM »

The PI trimmer is used in order to get the same AC voltage on both V3 triodes.

1) So the best way to adjust it, is using a tone generator with e.g. 400hz and put a large dummy resistor in your speaker jack and turn up the master volume a little bit. The measure AC to ground at both pin 1 and pin 6.

2) Another procedure is setting the PI trimmer so that pin1 gets 6-8 volts DC more volts than pin 6.
Pin1 will usually have more DC voltage when set for best tone....

3) Use your ears.....listen. And adjust the trimmer for maximum feel, sustain, harmonics, and feedback. Some people like to turn up the amp dampen the guitar strings with your hand a gently rubbing the strings and liste for max high frequencies and hiss.

PS this subject has been throughly covered on this forum, so use the search function to get more knowledge Wink


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Respect for the big guy's work....we're at this part of the forum because of HAD's amps.

drew.12345
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Re: ODS PI trim pot adjustment help

« Reply #2 on: January 30, 2010, 01:38:29 PM »

Thanks for the help it is much appreciated as well as the quick response. I will definitely give it a shot.


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