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Hello everyone! I`m making a tube amp for my graduation work and I decided to make a Matamp based one. I only found schematics for the non-master volume version and the main problem for me is the drive knob. On the original it`s a 3 pole 4 way switch and on the master volume version it`s a pot. I heard that oranges from that time are similar and those have a gain knob, but those have it after the tonestack and the matamp has it after the first gain stage. If someone has a schematic for the master volume version or any tips, it would be appreciated.