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Anyone come across this before?Installed new-to-me tubes in my Manley Labs Chinook phono pre. Right off the bat everything is sounding great! I turn the pre off for about a week and when I turn it back on, I notice the right channel isn't producing sound.
I check out the tubes and sure enough, one of them is NOT glowing? So I swap it into another location where a tube was working, ya know just to make sure it wasn't a fault with the phono pre, and it still doesn't turn on/glow.
Do tubes really go from good one day and then totally dead the next? I thought it would go through a noisy period and then die a slow eventual death.
Anyway. Tubes...
Edits: 03/29/16Follow Ups:
I find that heater filaments pop more often when they are cold and the unit hasn't been turned on for a long time. Fuses do this, too.
Think it has to do with the reduced resistance in the cold causing larger influx of current. Once the tube is warmed-up the filament resistance rises, lowering current flow.
For amps that have been sitting for awhile, I ramp them up with a Variac.
A low temperature before startup is probably not the case. There's a pp 6BQ5 amp in my garage that gets fired up in the winter when it's 20 outside. It's been in the garage for 4 years or more....used during all seasons. No issues.
Your results may differ.
I could be wrong. It would be the first time. ~ Byrd 2006 ~
"I can't compete with the dead" (Buck W. 2010)
"It would take me forever. I don't think I have forever" (Byrd 2015)
It sounds like the bad tube's filament failed. That is not uncommon. This is one reason why you should let the tubes cool down before handling. When the filament is red hot it is more fragile. cheers, Dak
But also be wary it could be a problem with phone/pre, particularly that tube socket. I had been rolling tubes once and unknowingly pushed a socket solder joint over the edge. Drove me crazy because I went from experimenting with sound to "why are my tubes failing?" Luckily I spotted a spark across one of the connections. Benefit of listening in the dark! Soldering fixed it. Problem gone.
So keep an eye on the pre-amp just in case. Might want to avoid expensive tubes until your sure.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
So I installed all the previous tubes back and they're working just fine (for now). I think maybe something critical failed within that particular tube. Makes me a little weary to say the least. :-(
Ain't tubes fun!
Worth it though.
Hopefully every will run well and you can get back to rolling.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
Not the normal mode of failure for sure. They most often die slowly or go noisy. It sounds as if maybe the connection inside to the filaments has blown/broken. Unusual, but not outside the realm of possibility.
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