Why do some model names use "MKII"?

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.

"Mark" is the term con men use for their victims.

Pubul57: You forgot "Statement"

Interesting question, though not, by any means, restricted to amplifiers (see cars, vaccuum cleaners, etc).

A little search on the etymology of the phrase didn't yield a direct answer, but here's a guess based on what I saw.

One archaic meaning of "mark" is boundary. "Mk II" would suggest an expanded boundary (presumably for performance) of the "Mk II" device in question, relative to the MKI. Similarly, the "Mk III" would push the boundary beyond the "Mk II".

Just a guess.

Marty

We have used this nomenclature. Our first lineup did not use the 'Mk I' tag; that got applied after the Mk IIs were introduced. So the Mk I lineup went for about 17 years.

The Mk II was the most significant update that we had developed during that time. In it, we went from miniature tubes to octal tubes, so to update older amplifiers required us to do a lot of chassis work to accommodate the larger tubes. None of the prior updates needed this- nor were those updates as significant- hence Mk II.

The Mk II series went for 9 years and in 2005 we introduced the Mk III series. What is nice about this approach is that it allows us continued refinement of the basic models, for example our flagship preamp, the MP-1, has been in production since 1989, although considerably updated since its introduction. This approach allows us to support the legacy products in the field- we can update any of our prior amps or preamps to meet the latest spec, and when we do that we reactivate the warranty.