1 JimmyR 10 months ago This has got me really stumped. Months ago I built a 5E3 with some nice MM trannies, Mojo chassis, board and cab, Sozo and F+T caps, Celestion Gold, all the stuff I usually would use. I use a little choke instead of the big resistor between the first filter caps, and use the Ampeg style PI, also known as the PaulC mod.But whenever I play this particular amp I get a harsh, static-y crackle on the note attack. I have checked for dry joints, bad caps, bad tubes, broken tube sockets, arcing tube lugs - every single thing I can think of. I have replaced every tube, checked every socket...So this weekend I totally rebuilt the amp. I used new resistors, caps, octal tube sockets, and even a new board. I am very anal about my builds. I fill each eyelet with solder but not over-fill, and I'm super careful with wire routing. So when I was finished the rebuild I tested the amp through my tweed Super's cab which has a Celestion gold 12" in it. All good! No crackles, very low noise floor, low hum, sounds absolutely killer. So in a good mood I put it back into the Mojo 5E3 cab with the Celestion Gold 12" speaker in it, and fire it up. Immediately the crackly attack is back.What on earth could be causing this? One of the 6V6s is quite close to the speaker but it's nowhere near actually touching and that has never been a problem before in any of my other 5E3s anyway. Hmmm... I guess my next job is to test the speaker and it's wiring with a different amp. Has anyone had something like this before? It's kind of annoying.