Vendor should replace the tube and maybe retest the others. I use Upscale audio and have had great results. I know UA does very extensive testing.
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Are you sure that the resistor didn't take the tube with it?
It's unlike a tube to blow that drastically on its own accord. If they are that new, it should be easy to match up an 8th tube. A good dealer will be able to easily do this. You may have to send the 7 back to have them match it properly?
Ask the tech who is going to fix you amp what they think caused the problem.....
Thanks for your responses.
My tech said that it was clear that there was a failed tube.It took 2 resistors with it.BTW,turns out that the Svetlana 6550Cs that were sold to me are actually made by Sovtek.
Anyway,Vintage Electron has offered to replace all 8 tubes,and I will probably content myself with replacing the matched quartet that includes the failed tube.
This is my first experience with current production high power output tubes.I have been quite spoiled in the past with amps that take the likes of KT66,EL37,EL84.But,my CLss need the power.