I love my Pro Junior. What a sweet tone it has. I have a Tweed version from a few years back.

I just got tubes replace a while back, and it's been great. However, since the last little while, it has started to hum abnormally loud. The tubes look alright. I'm no amp tech though. It sounds like normal, I think, it just way more hum than there used to be.

I also noticed when touching one of the power tubes, there is a little bit crackling happening. Perhaps a bad socket?

Any ideas?