|gregmon79 ||02-21-2014 12:54 AM |
Internal Trim Pots on the AD409
Hey all. So I recently picked up this pretty awesome delay and I'm enjoying quite a bit. I decided to start tweaking the internal trims and I'm having some difficulties getting it back to factory specs. I wanted to extend the delay time a little and I believe I did. I just want to know how to get it back to factory specs as well. Does anyone know how I'd go about doing this or know of a site I could go to to accomplish this? For as popular and well liked this delay is, I'd thought I'd find more info online about it. It's pretty simple in the end but it is a dang fine delay. Thanks to anyone that can help, because google searches didn't really yield much as of yet.
|Pastrami ||02-21-2014 02:22 AM |
Cool but I'd still like to know what trimpot is which. I really want to extend the delay time on mine as I really love dirty repeats in a delay
|Dr Greenthumb ||02-21-2014 02:45 AM |
Isn't it written on the PCB above or below each trimpot what they control? Here's the best guide for tweaking the trimpots, for more info I would contact EAR.
Bias, Clock Speed, and Clock Null are all trimpots that are accessable by removing the bottom panel of the enclosure. Any tweaking of these parameters comes with a caveat: you may not like the changes you make, and you may find it difficult to “reset” these controls without a multimeter.
The Bias control has a relatively narrow window of operation, though with careful tweaking you may arrive at subtle tonal differences that won’t comprimise the pedal’s functionality.
Clock Speed controls the range of the delay time. The factory standard is set to approximately 20ms (min) to 300ms (max) but by turning the trimpot you can get slightly faster and slower delay times.
Note, however, that all you are doing is shifting the range of 280ms up or down, so that if you make the longest delay longer, then your shortest delay will also get longer (and vice versa).
If you adjust the Clock Speed you will also likely have to adjust the Clock Null which helps minimize the amount of clock noise in the delays.
This can easily be set by ear: first, turn the Echo knob all the way down and turn up the Delay knob. Start playing and turn the Clock Null until you find the “sweet spot” where the high-pitched whining goes away. You could also, if you wanted, deliberately introduce more clock noise to taste.
|gregmon79 ||02-21-2014 09:01 AM |
Thanks for that link. This is exactly what I was looking for. And yes, the trims are labeled. You will see it clearly if you look closely.
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