The Mysterious Mesa Mark IIB+ | Analyzing a Factory-Modded Circuit

In a recent video, we looked at a 1980s Mesa-Boogie Mark IIB which is owned by Greg Martin of The Kentucky Headhunters. Some commenters pointed out that the amp had received a popular factory mod sometime later which is commonly called the "Effects Loop Mod" or the "Mark IIB+" mod, often performed by Mike Bendinelli (Mike B.). The mod involved moving the effects loop to a different location in the circuit, converting a cathode follower to an extra gain stage, and adding a "post effects level" which acts as a global Master Volume. In this video, we'll examine and analyze this example, drawing out a modified schematic, which is something that hasn't been done before anywhere I can find online.
#Mesa #Amplifier #mods

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