WT-400. Bought mine new in November 1997, and haven't thought about another amp until last December when I played a GK MB-200 (? the little bitty amp that's about 4 pounds) which made me start thinking of a new light-weight amp. When I was gigging regularly I had two WT-400 (second one from around 2001 got to augment the original one, and a WT-500. My original 400 was slightly warmer sounding (which could be just my brain and have NO relevant reference to reality).
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"Without space, music is just noise piling up on itself." TRK
"Don't play your instrument, play music." Feral Feline
Lakland Owners' Club #248