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So I swapped out the two outer tubes (since I only ever play in 60 watt mode) and I'm not blowing fuses now, but my volume is way down. Ideas anyone?

Hi, I know this question has been asked time and again, but please indulge me. I'm a new-b and appreciate the depth of information on this board immensely...So, here goes...without any warning or other signs of trouble, my 1978 mark I is popping fuses all of a sudden. I did nothing to the amp...

I have a 1978 Mark series amp that I got on ebay a few years ago. It has a 15" speaker, eq, reverb, etc. and sounds very nice. I'm not sure it is all original, as it has an effects loop (was that an option back then). Does anyone know whether this is a Mark 1, or ? I was told it is a "1b" -...