Counterpoint SA 220


I recently purchased a Counterpoint SA 220. It's in very good condition and sounds great... just as I remember my SA 12 sounding.... BUT, I can't get rid of the hum. You think I should replace the tubes? Has anyone had in luck getting these to quiet down?
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As for the upgrades... I'll eventually do them, but for now I'm happy with the SA 220. Besides, my CJ PV-11 preamp is getting $1200 upgrade... can't afford both at this time.
Get a budget line conditioner, I had hum from a computer i was running into my stereo, plugged computer into the LC and problem solved
Sorry, no line conditioners here...

I have a dedicated circuit for my amp on the front wall between the speakers and another dedicated circuit for the components on the side wall.