Why do some model names use "MKII"?


Ok I am going to show my ignorance here. It seems very common for an amplifier to have a model name with a MKII reference. It seems to designate either an upgrade or a special version of a previous model. Can anyone educate me as to the origin of this nomenclature? I am guessing it is a tribute to a classic guitar amp, but I'd love to know for sure.
waz664
I think that many do pursue the ceaseless pursuit of improvement, sometimes parts become unavailable and new one's must be used. However, I do think that the basics of great preamp and amps design is pretty well figured out and has been for many years, though there have been some improvements in passive parts. So yes, there is a quest for improvement, but there also is a very power marketing reason for new models on the showroom floor.
After MKII, sure to follow will be Ultimate, Special Edition,
Signature Edition, Reference Signature, and finally Master
Reference Signature Edition MKII followed by the new MKIII.