I got a triple rectifier in the mail last week. I noticed that there was a high pitched rattling hum coming from the tubes so I assumed they were on their way out. Here's a link to video showing that noise: . Today, a new noise started where a harsh cyclic hum was coming out of the speakers. Here's two videos of that noise: and I was trying to get a partial refund from the seller because he didn't mention that the tubes were bad. He said that the noise wasn't happening when he had it and he opened up a shipping damage claim with reverb. Should I just return the amp? I like the amp but I'm not sure if this is coming from bad tubes or damaged internals.