EDIT: See post #6 for details. Original post follows... So I recently got a JTM30. I can't leave good enough alone. I replaced the 1N4148s in the clipping section with LEDs, and I really like the overall character of the drive now. It plays much better with pedals, but the bass response is now rather flabby even with the bass knob all the way down. Where should I go from here? Hmm, if I'm reading the schematic right, R114 and C113 seem to form a low-pass at 720 Hz. That sounds really low, and might match up with what I'm hearing. Is it safe to bypass this? I may have melted away a solder pad, because the initial result was like the one described in this thread: http://www.marshallforum.com/threads/marshall-jtm-30-i-removed-the-clipping-diodes.63517/ , and while gimmeagig seemed to like the sound of the clipping diodes simply removed, I did not. I jumpered D101 to C103 and got the boost channel back. Also, how do I get the main board in/out with that plastic rail in place? I really struggled, before finally getting it out. Now I couldn't get it back in, so I removed the little plastic rail thing stuck to the board. Works fine, but I'm worried about support of the board.