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I have to bring my Mk V chassis up to Mesa's factory in Petaluma to apparently replace a failed diode or something that has killed everything (LEDs, fan, etc.) other than power to the rectifier and power tubes. There are two cables going from the chassis to the reverb tank that are zip-tied...

Is it normal for the different modes in channel 1 to have radically-different volume levels? "Clean" is down about 5 dB from "Fat," which in turn is down another 5 dB from "Tweed." If this is abnormal, what is a likely cause? Preamp tube? If so, which one? Maybe V3, since neither channels 2 nor...