Sounds like a lack of engineering foresight. 5687 tubes have a larger cathode than typical small signal tubes. They run hot and are probably melting the circuit board or an adjacent passive component.
Tube smell?
Some 5687 tubes I just installed have a mild but definite
burning-rubber odor. It's not extreme, but it is there
if you sniff around them (and I can also detect it around
the room). Has anyone ever had this? Could it be something
oxidizing because they are newly installed?
It's a bit hard to tell, but it seems to be all 4 of them,
not just one.
The tubes work fine, but look brighter than
my old cheaper 5687s. They sound absolutely great,
nice and smooth and mellow.
It's not the amp, as the old tubes don't smell.
Thanks for any help.
burning-rubber odor. It's not extreme, but it is there
if you sniff around them (and I can also detect it around
the room). Has anyone ever had this? Could it be something
oxidizing because they are newly installed?
It's a bit hard to tell, but it seems to be all 4 of them,
not just one.
The tubes work fine, but look brighter than
my old cheaper 5687s. They sound absolutely great,
nice and smooth and mellow.
It's not the amp, as the old tubes don't smell.
Thanks for any help.