[codefox1]

A fistfull of DC ammeters of diferent values which can be had cheaply at times is nice, and a working or restorable VTVM also will help. A cheap modern digital frequency counter will tame the vintage RF generato you may get, and just about any working tube tester that has sockets for the vintage sets you think you maybe working on would also be nice. I use an old fashioned lamp dimmer to tame down the soldering iron and also sub for a variac, although there is no isolation and it don't work on solid state sets.