Q: Why do some Marshall amps have a “MKII” on the front panel (such as the 1987X), when there doesn’t seem to ever have been a “MKI” version of the amp?
A: The story we have heard is that on older Marshall amps, “MKI” (taken from Jim Marshall/Ken Bran, the designers) denotes a prototype amplifier, while “MKII” denotes a production amp.