2. amps-preamps
  3. 177376-1660

Disappointing short life of NOS preamp tube

Being sarcastic really.

I only got 7 years out of  50's 12au7 RCA black plate. That may indicate 5 more randomly futzing out the rest of this year.

With the state of tube pricing now, tubes definitely not on my list of unnecessary audiophool spending.

I was really hoping these things going for 20, especially them just being preamp tubes, not a power tube. Fortunately, I have one more for backup, plus the 6 stock tubes in the shoebox.

Such is life. I'm more impressed by my relatively quick troubleshooting, avoiding severe neurosis. Less than 5 minutes-patting myself on the back, and praise from the boss.

.

tablejockey

Showing 2 responses by mulveling

mulveling's avatar
mulveling
1,774 posts
 

7 years / 5,000 hours is OK. Where’d you get the tube from? Any chance it wasn’t really NOS? To be fair, 12AU7's get a lot hotter than say 12AX7.

mulveling's avatar
mulveling
1,774 posts
 

I get most of my tubes from Brent Jesse, and trust his listings. If he say’s their NOS, I rely on that.

I actually wonder that. Not sure there’s a guarantee of being "NOS", or whether that would even matter except for power tubes. That said, I’ve bought many, many tubes from Brent over the years and I appreciate his service and selection. He’s got lots of really nice exotics you can’t find elsewhere, except for taking gambles on the ’bay. Brent’s tubes always test good and sound great! He doesn’t make mistakes. No bum tubes. He even takes care to generally select clean looking tubes.

If you got 10,000 hours on a 12AU7 I think that falls into "great job, little tube" territory :) 

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