EM 800 "Magic Eye" tubes

[AcePepper]

What can y'all tell me about these things? Or other types of "Magic Eye" tubes? I found tidbits of info on a couple other sites. It looks like the EM 800 is a 9-pin mini with one normal triode and another triode that does the display-part. Could I use this as part of a preamp? Does it fit a "standard" (for guitar amps) 9-pin socket? Any ideas where to buy these? They just look insanely cool!
Thanx!

[sportster4eva]

Check out some of this info.
http://www.vacuumtube.com/eyetubes.htm

Here's Steve Bench's site. Search for eye when you go there.
http://members.aol.com/sbench101/

Here's a level indicator made out of one
http://www.audiohobbyist.com/projects/magiceye.htm

You could use the triode as a gain stage, and drive the target at the same time I suppose. I have always wanted to try it, but all the eye tubes I have are the round type, and they're not as dramatic looking when they swing.

[trevorus]

The Trace Elliot V8 Bass amp has one of those for a VU meter.

[AcePepper]

Thanx for the info! Especially the level meter, just what I was thinking of! Any more links/info would be great. How much signal do you suppose it takes to drive one of these things? Would you feed it a preamp-level signal or would you take it from the output, or maybe from the bias? Any old hi-fi schems that might illustrate how they're used?
Thanx!