I'm finally breaking down and buying a better amp after 2 shows in a row of having the volume knob cranked to 11 on my current setup. Was down at my local shop today and played an SWR Super Readhead and I was really impressed. I've been reading other threads and finding out that the pre-Fender models are much better. Is there a way I can easily tell how old this amp is? Any other input about this amp is greatly appreciated. Thanks guys!