Beveridge OTL amplifiers: Log your tube failures here

I've owned my pair for only four years but have had about 20 tube failures. Sorry to say I didn't bother to log these to see if any patterns fell out.

I can say most of my failures take out both the upper and lower tube in a totem pole. I rarely lose one tube at a time.

Also I have never had trouble in both totem poles at the same time. Failures do not cascade from one to the other.

What do you think of this for a format:

Which tube failed in totem the pole? upper/lower/both
What brand(s) of tube?
How did your fusing behave?
Did other parts fail too?

I just ate a pair of Sylvania's last night so I will reply to myself with the first data point ":^)
 
Jan I've had many many failures and I have not been keeping track of such details until now. No pattern ever presented itself however so I will say random.

One of the things I'm keen to know is does the upper or lower tube fail more? Right now I have no idea.
 
I had received my amps in failure... and I have had one further failure during my testing. I will keep track of things moving forward.
 

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