I finally found someone on this forum that had the same problem
http://www.grailtone.com/forum/viewtopic.php?f=33&t=68776
The solution was
Is this a good solution? I tried doing that but I'm not sure the amp will have the same tone then
Hello everyone.
I'm having some troubles trying to set the levels of my beloved Mark V:25 with the GMajor.
First of all I want to say I read both the manual of the mesa and the TC.
As a matter of fact, the only output level in the Mark V:25 is post loop - pre power amp, so it's equivalent to...
Hello, suddenly my Mark V started doing this strange sound, it sounds like a filter.
Can you help me investigate the cause and how to fix it?
After a while it goes aways, but then it returns.
Thanks a lot.
https://www.youtube.com/watch?v=fjaAwftg4lE