Hey guys, just wondering if anyone here has experienced what I am seeing here. I've had the DT25 along with the HD500 now for awhile with no problems. The other day I noticed that when I switched to Class A/B the amp would screech, drop in volume, then cut out / clip. I have the latest (and even reinstalled) firmware. I am running directly to the DT25 and it has clean power. I must mention that Class A gives me no issues. Now, it doesn't appear to be volume related either, this will happen at low volume. Since both classes share the same tubes I assume the only thing left would be a transformer going bad???

Thanks for any input.