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Hi folks, I’d appreciate some advice on a now very dirty sounding Audio Note Kit 1 300B amp that I bought recently. The amp was purchased with the original valves which have never been changed, it’s an earlier kit 1 (I believe built around 2004 give or take). Circuit diagram below if it helps. I budgeted for a complete new set of valves and I’m happy to replace them all if needs be. I haven’t gone out and bought new valves because up until today it has sounded phenomenal, I fell in love with it as soon as I heard it and I’ve probably used it for around 40 hours since buying it. Earlier today I put it on and after about 30 minutes I noticed the sound changed, it was like someone pushed a distortion peddle on a guitar. You can hear the distortion and I don’t fancy just playing Nirvana for the rest of my life so I’d like to get this sorted. I also noticed that the transformer directly behind the rectifier was exceptionally hot even though the others hadn’t even started to warm up. I haven't had it long enough to really be sure if this is normal or not. It has been getting hot after a long, long session but nothing that has worried me until today. I started it back up after letting it sit for about 6 hours. It sounded fine at first and then went very distorted again. I also noticed that when I turned the power off - while leaving the source playing it briefly went back to sounding perfect again but then faded out as the power reserves were used up. Should I just start buying replacement valves and start swapping them out to see when it improves? Should I start with a particular valve(s) or could it be something else completely? Any suggestions or info gratefully received. Here is the amp: I believe this is the correct circuit diagram: