[Monster Factory]

I won't be able to qualify these statements until I can rip these things apart and spread their guts all over my bench (it is a Monster Factory, you know), but here's what I 'think' I'm able to decypher from their spec sheets:

The 333 and 333XL seem to be knock-offs of the Marshall JCM2000 amps, in particular the DSL. The 333 is a 6L6 version and the 333XL is an EL34 version.

The 6260/6262 is a not-so-veiled knock-off of the Peavey 5150/5150II.

Bugera is part of Beringer, who have been known to "study" other products close enough to get sued over it. Close studying is about all we have with regard to tube technology, though. The triode celebrated its 100th anniversary last year. Jim Marshall said it best, "There is nothing new under the sun (with respect to tubes). It has all been done before." And it has.