Yes, "MG" type see my post of Wed, 17 Feb 2010 20:18:18...... Dennis D. W7QHO Glendale, CA On Feb 18, 2010, at 6:40 AM, Ian Wilson wrote: > I have a couple of Arcturus tubes that are clearly > metal-can-over-glass-envelope. > These are noticeable because they are quite fat, and appear to have > been poorly > done in something of a hurry.