Ancient Rectifiers

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Mddeming-at-aol-dot-com>

Hi All! 

Does anyone have knowledge of/remember/ever seen large rectifier tubes 
(~12in. high) with screw bases like a lightbulb? I know they are rated >100 
kV with 6.3 v / 6 amp filaments. Two are VR-17C, one is a VR-6-CFR and one is 
a Machlett ML-46-E. Other than the fact that they are of great vintage (like 
me) and from old X-ray machines, I can find no other data. Thought they might 
make a heckacious full-wave bridge. Any help out there? 

Matt D.