VTL tubes 6550A,B,C, WA or WB?

I'm using VTL MB250sig, what are the tubes that VTL using and the differences between those tubes...

Thanks

hi507-14-2009 4:02pm

halo88 Details Discussions Posts This discussion Message User 6 posts 08-17-2009 at 07:32am Copy Comment URL Report Comment Edit Delete Hi Hi5, Current production VTL amps are using SED winged C 6550C. http://www.upscaleaudio.com/SED-quotWinged-Cquot-6550C_p_16.html These are IMHO one of the best current production KT88/6550 tubes. Regards.