I picked up a Fender Excelsior today. The amp was cheap because it has an intermittent issue- some rustly/rumbly sounds. The owner couldn't duplicate the problem while I was looking at the amp. Later, I warmed it up for 15 minutes and the problem appeared. It could be as simple as a tube, maybe a little more complex. The amp's in great shape, otherwise. I'm pretty impressed with the sound of it so far. I'm not sure if I'll keep it once it's sorted out- I'm thinking about selling some gear to build an 18 watt Marshall clone.