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Message: <blockquote data-quote="Squidz66" data-source="post: 518744" data-attributes="member: 17047">Thanks Jedi,After posting this I did see there was a few questions asking the same thing..I have only recently purchased it ..And it sounds great.So what I did was ..Take it out of it's rack , unscrew the top, See that they are MESA tubes in there1 was a 12ax7a ...the other two were 12ax7.. Got scared!Put them back in ..Re-screwed and put it back in rack!!!WEAK!!!!I know nothing about why one would be an 'A' ...and the others not!It is IMPOSSIBLE to actually roll these tubes...I will have another go soon...Is there a difference???????</blockquote>