Re: Toob vs. Tube

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

Original poster: "Ed Phillips" <evp-at-pacbell-dot-net> 

"
While the 304TL might be electrically rugged, its definately got some
mechanical issues.  Awhile back i had a 304TL filament crack from some
minor jarring.  Also, most of the 304s i try to get off of ebay always
ship out fine, but when i get them their filaments are always broken.
Something to beware of, especially with these old tubes.

Steve"

	Tungsten filaments get very brittle after running hot for some time.
Happens to the filaments in big light bulbs too.  Those bum tubes may or
may not have been good when shipped, but could have been.

Ed