I switched tubes and the problem remains with the amps.
I did check the fuse and changed the fuse before installing the new tubes. It was fried after I shorted the tube.
Initially when I first shorted the tube, I contacted Quicksilver. They confirmed that the tube was shorted and said that all I needed to do was replace the tubes.
One more issue regarding fuses. This whole problem started when I blow the fuse. No doubt because the tubes had reached the end of their life.
When I replaced the fuse and powered back up the amp it is then that I shorted the tube. I question whether the replacement fuses that I am using has something to do with the problems or damage. The fuse rating is correct but the fuse construction of the factory fuse appeared far superior to the replacements.
One final note, with the bias dialled down the difference (relative to the other amp) in the heat generated by the power transformer is significantly reduced.
Thanks Mechans, Monday the amp will go for service.