Looking at the schematic for a Marshall 18 watt (https://www.thetubestore.com/lib/th...Marshall/Marshall-18-Watt-Schem-Schematic.pdf) it seems to me to have many characteristics typically associated with Vox amps, not Marshall. I've always thought the 18 watt had a more nasally tone, like a Vox, less the beefy, warm tone of a plexi. Has anyone ever tried experimenting with things like changing the power tubes to be fixed bias instead of cathode biased to make it sound more Marshally? Would this work, or would it fail to make enough of a difference, since it's using EL84s instead of larger tubes like KT66s or EL34s? Another possibility might be adding in a presence knob and a TMB tone stack? Or maybe using a closed-back cab?