Thank you Jérôme. I got your text and I'll try to call them today. EveAnna has directed me to the support department and I've sent them a long email.
I agree that the probability of both amps failing is very low. I'm only suspicious of the left channel which has blown 3 fuses in 3 days with 2 sets of tubes.
I was quick to blame the Tung Sol but I believe they are still pretty new and they don't have a lot of hours on them. Winged C are NOS but the production has ended very recently so they are not really NOS.
There is something very wrong in my system, it may be the electricity, the amp or the tube. The driver could be the origin for the noise but I don't think it has anything to do with the fuse blowing up.
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