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In Reply to: RE: Oops...time to change that tube posted by immatthewj on June 27, 2023 at 20:12:34
If not for bad luck you might have none at all.
Leaving out tubes that had hissy fits or rushing, I've had about a half dozen fail dead while in service. The last one was a Sovtek 6922 in the cathode follower spot of the phono of my CAT SL1. Had a Mullard branded EZ81 die in my old Counterpoint SA3000. The rest I can recall were RCA/GE/Sylvania 6GE5's in my Acoustat servos. There was three or four of those, but they all happened during the shakeout period after the amps were updated and put into service. Turned out the sockets were toast and causing arcing and a red-plate. Had new sockets installed and the problem disappeared.
Sorry you had such rotten luck with those Froggy RCA's.
Follow Ups:
. . . "Leaving out tubes that had hissy fits or rushing,"
but I'd have to think that those tubes would meet OP's criteria for "diminishing performance"?
'Diminishing performance' is sufficiently broad to cover hissy fits I think.
In which case, easily triple my earlier count. Lots of poorly made noval tubes that just didn't cut it over the years.
"I'm a-picking . . ."
"And I'm a-grinning!"I've often thought the same thing, but on the big things, the things that count, I guess I've been pretty lucky. I spent my misguided younger years trying to become some kind of self-fullfilling prophecy. I remember hearing the song "James Dean" on KSHE and then buying the "On The Border" LP because I thought that "too fast to live/too young to die" was an ideal to strive for.
But 40 years later, or there abouts, and I am still here.Anyway, I don't know what was up with those RCA VT231s from France. To begin with, I thought my new-to-me preamp had taken a crap. I don't really have a grasp on electrical theory, but I am assuming that it was not both of the tubes for one channel that went bad (TWICE!) it must have been one tube failing and then the other socket wasn't getting power? Anyway, I did not experiment to try to figure out if (TWICE!) I lost one tube or both tubes (TWICE!) for one channel, the experience made me nervous about screwing up my new-to-me preamp, so I just (TWICE!) put the pair of tubes that wasn't functioning in a box. Anyway, what I learned from that is that I won't buy tubes off Ebay anymore.
But other than that, things are good for me in the 6sn7 world. I hope all is well with you.
Edits: 06/28/23 06/28/23
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