Mystery of the Dissolving Getter

Tubes Asylum

Questions about tubes and gear that glows. FAQ

A while back (about a year ago) I purchased a quartet of new production 300B's for use in a pair of Manley Neo-Classic amps. A few months ago one of the tubes failed quite spectacularly upon being powered up. Since then, the remaining three have all slowly died. Upon death each corpse displays only traces of the getters that once were, and there is gunk of some sort at the bottom of the internals. I am no expert - my tubes usually work! - but does anybody have any idea about what the problem was here?
PS. My 1998 Westerns and 3 of the 4 stock EH tubes work just fine, after 15 (!) and 10 years, respectively.

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Topic - Mystery of the Dissolving Getter - faskenite 07:55:58 07/13/15 (7)

It would seem you have lost a true vacuum and . . - John PA 17:06:45 07/13/15 (1)

Who manufactured the failing tubes, and prod year? nt - Balle Clorin 23:28:34 08/07/15 (0)

RE: Mystery of the Dissolving Getter - unclestu 13:12:12 07/13/15 (1)

Agree... - Lee of Omaha 11:42:59 07/16/15 (0)

RE: Mystery of the Dissolving Getter - unclestu 12:56:46 07/13/15 (1)

RE: Mystery of the Dissolving Getter - faskenite 07:28:57 07/15/15 (0)

RE: Mystery of the Dissolving Getter - JKT 11:20:39 07/13/15 (0)

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