Sorry to hear about your continuing troubles...
Tubes can be troublesome and sometime you just have bad luck - a friend absolutely loved his MC275 (latest edition) even though one zener diode died shortly after he got it causing some tube troubles, then a tube died and took out both the tweeters on his new Dynaudio speakers...
Drop me a line if you need any help checking out the tubes...could be again a tube failure taking out a fuse...
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