I've got a nice clean, fully working, B&K 470 available. Comes with a #23 and #31 (k7000 and other skinny neck), plus a bunch of other adapters. Just used it the other day to test a tube and it worked perfectly. Have all the paperwork for it too..
Just don't use it much anymore as I've gone from rejuving tubes to just replacing them with tv donor tubes.. Shoot me a pm and we can chat about price or maybe trade.