Mesa Mark IV Preamp


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Chevelle are one of my favourite bands and their sound is based on the Mesa Mark IV, which I'm honestly never going to buy. But I'd love to have a preamp pedal based on that amp. Master Effects Pedals sell a few preamp pedals including a Mark IV clone, but I'm keen to build one myself. Their model is included for reference:
Edit: I found a schematic of the Lead channel
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