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great thanks, that's really helpful. I'll check what he gave - I've built a few of his kits and the problem is he sometimes just gives rough approximations of the values of parts.

I noticed comparing to pedfal PCB, mine has a 4001, where as PEDALPCB has 1n5817. Also the ICs are 4580D vs a LM833. Could either of those be the culprit?

Hi, I recently built a JHS andy timmons OD pedal (from jedspeds kit).

I've never played a real one but I find it lacks a bit of bass and low end. It's not really thin sounding, but I feel like a little something is missing. Comparing it to my full drive 3, it definalty lacks a bit of bass - maybe its supposed to! The only setting I like on the @ is the 100w mode. Its the only with some low end to it. And no matter how much I play with the EQ and air pots, its still a bit thin.

Since this build I've done lots opf reasearch to building pedals not from kits (got some madbean pcbs on order) and found that using differnt capactiors such as ceramics might filter out some low end. Is this the likely cause of my problem? and if so, which caps should I replace, and what with?

Any help would be greatly appreciated.