Myles: This is from the other guitar player in my band. We were hoping you could help... thanks so much! Mike Traynor YCM Custom Valve 40 1x12 bought new in October from Musician's Friend. 1) low cycle hum will occur intermittently, lasting for about 5 seconds. This has been occurring with more and more frequency of late. It happens while I'm playing, seemingly during bassier chording. But I've also experienced it between songs as well. The hum will dirty the sound big time. This is NOT pickup hum, as I've tried with different guitars, cables, etc, unfortunately with the same results. 2) Volume drops also occur at frequent intervals. The drops will usually cause loss of about 20-25% of the total volume, and can last for over a minute. These also do occur with varied guitars and cable setups. Both the loss and subsequent volume return are instantaneous. I've checked over tubes, wiring, speakers, etc, and all appears to be securely in place, and in fine condition. The amp has never been dropped, or abused, and only has about four gigs and 12 rehearsals on it. For the record, none of these problems occurred out of the box.