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Hello, If anyone has the 3 Channel Rectifier FX Loop Parallel to Series Mod Schematic, could you please kindly post it here? I was in contact with Mesa yesterday and they failed to email it to me. It is NAMM right now, so I understand they are busy :) Thank you! -S

Update..... The problem tube is microphonic. I also switched it out to a different position, the problem tube was still dim, no matter where it was. Other tubes in the problem tube position, glowed normal. Thanks for the help and advice on the EL34's fluff191!! The only thing stopping me now...

Not sure how to tell if a 6L6 needs changing or not. It is the last one in line before the rectifier tubes. The first 3 6L6's look fine. The top of each tube is like looking at a light bulb, bright and clear. The 4th one, is more like the ambers from a cigarette, not bright, dark...

I bought them here http://thetubestore.com their office is 5 min drive from me, luckily. I replaced all my AX7's with brand new Electro Harmonix Tubes. Do you think I'll be able to hear a clear difference if I tap on the actual tube itself? Like I said, the whole head is microphonic now. Even...

I recently changed all my pre-amp tubes because of some loud white noise I was getting (old topic http://forum.grailtone.com/viewtopic.php?f=24&t=45597). For a few weeks, all has been fine, no noise at all. Today I notice every part of the head has become microphonic. Even with all the volumes...

Cool thanks man, I'll give that a try! Noise is gettin pretty **** loud too.

Greetings, Using my Dual Rec, on any channel or mode, I'm getting some "white" noise coming through quite loud now, even with a noise gate. I'm assuming its one of the tubes needing to be replaced but have no idea how to tell which one it is, Rec, Power or Pre? Is there a way to diagnose this...