convergent jl3 monoblocks versus jl2 stereo

who has heard the new jl3 monoblock? it is really better than the jl2? are they altenatives for the stock tubes, russian 6550C? it is possible to replace with kt 88? thanks, alex
no one heart the new jl3 monoblock?
Many of us heard them demonstrated at CES in January driving Merlins.

Brian Walsh
It is technically possible to substitute KT88, Ken Stevens strongly urges that you not do that in terms of sound quality however.