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I have the Ernie Ball Jr. 250K, and I run it in front of the amp to imitate the effect of the guitars volume knob. This allows me to alter the amount of gain with the volume. If you want to affect the volume ONLY, you would need the 25K version of this pedal and run it in the loop. This would...

From my (breif) experience, I would say try switching a few preamp tubs around, and take note of the responsibility of each tubes position as explained in the manual. If you notice a change in sound afterwards (as I did) you probably have a bad preamp tube. Make note of which tubes you switched...

Update: I talked to Mesa customer service and they are guessing it is a pre-amp tube problem. They will be sending out another (it sounded like only 1) for me to swap out one by one to see if this fixes the problem. Hopefully if this is the cause, there is only 1 bad tube and not several. I...

Tube switch is in the correct spot, thanks. I'll update after I talk to Mesa.

Actually, I should have said I reseated all the POWER tubes... I was a bit intimidated to mess with the pre amp tubes, this being my first tube amp (after 16 year of playing guitar). Unfortunately I don't have any spare tubes to try replacing them. The power tubes however appear to be fine...

I have both of these settings as you recommended currently. Any chance the output to the speaker is the problem? I am using the proper cable and matched the ohms.

I have had my Mark V head with vert slant recto 2X12 for just a few days now, and I think that something must be wrong. I am getting a raspy, fuzzy tone any time I use any gain at all. Clean on channel one is sounding pretty decent, but otherwise it sounds like a brittle little practice amp! I...