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Help - Noisy GT sm5

Hi there new to the forum and was hoping to find a little help,

I'm looking at buying a used Groove Tubes sm5 off a buddy of mine. He let me borrow it first to check it out and it's got a noise problem. The mike sounds fine but has a pretty low frequency noise pop type of thing that comes in every few seconds.

noisy recording

I've been doing home recording for a bit but my knowledge level is low. One recurring problem I have is that whenever I record using a mic (a Shure SM58) I get a lot of background hiss. I'm running the mic into an M-
Audio Fast Track Pro and then into my Dell using an older Cool Edit Pro program. In fact, I seem to get some hiss even when plugging in instruments.