"A fantastic amp with monstrous tone..."
This is a Peavey amp, and it's modeled after the classic 5150 design, which goes without saying that this thing is capable of some monstrous tones. Contrary to what people have been saying for years about the 5150 and now the 6505 is that it's a noisy amp and that it is next to impossible to get a good clean tone out of it... For one, achieving a nice warm clean tone from the rhythm channel was a snap: anyone with any experience at all with TURNING A FEW KNOBS should have no troubles here. As for the noise, yes, it's a big amp, and like any monster tube amp, it's going to take some time before you are able to tame this beast, but a good noise suppressor and some knob adjustments will help take care of this problem. Also worth noting: I play through a Les Paul Standard with EMG 81/85 active pickups, which run pretty hot causing for even more noise...
The 6505 is both versatile but limited as well. The fact that you only have two channels and only one EQ to share between the two is a bummer. The good though far outweighs the bad. For starters, there is a toggle switch on the back of the head so you can change the ohms to match your cab between 8 and 16 ohms (I THINK there is an option for 4 ohms as well but I cannot remember off the top of my head.) Also, the footswitch has an effects-loop toggle on it, making the use of the effects loop very easy to use, which is great: I can't stress how much of a difference it makes to run your stomp-boxes through the effects loop rather than putting your guitars tone through them and then into the amp: everything is much cleaner and crisp, and if you get yourself an EQ pedal (I recommend the one from Boss) you can EQ your clean tone perfectly without sacrificing your distortion channel. Having the effects-loop toggle on the footswith eliminated a lot of unncecessary toe-tapping that I had to do before, and for that I am thankful considering I play a mixture of very heavy stuff with intricate effects-laden clean stuff.
Peavey has always been known for building amps that are built to last and take a beating night after night. This thing weighs somewhere between 50 and 60 lbs, and is built like a tank. I have heard many a story about people watching a 5150 fall off of a full-stack set-up, and still worked fine after being plugged back in. Considering the 6505 is almost the exact same design, I would expect the same quality. All of the knobs feel nice, and replacing the tubes is relatively easy. You can't beat a USA-made Peavey in terms of quality and reliability. Period.
Anyone who has dealt with Peavey knows they are the best in the biz. That's probably because they don't have to deal with their products breaking too often, and are happy to do something about it when they do. I can't speak personally about their quality of service with defective products as I have never had one, BUT, it's easy to get any information you want for it, and you can easily obtain the full manual for the 6505 in .pdf format from the Peavey website.
Well worth the money! It sounds mean as hell and easily stacks up to the highly over-rated Mesa's and Marshall's out there. It's also of high quality. For your money, you can't beat a Peavey head, and the 6505 is certainly no exception.
The Wow Factor:
This is a great-looking amp. It's simple and not too in your face, which I like. I can't stand the cheesy trucker-girl look of the Peavey Triple XXX, and thankfully, the 6505 is a classy looking head.
The only thing preventing me from giving this head a perfect 10 is the fact that there are only 2 channels that both share the same EQ's. Otherwise, it's a great amp capable of doing just about anything. Metal-heads will love it for it's monstrously heavy tone, and anyone else can enjoy a wide variety of sounds using the effects-loop with the rhythm channel. It's a great amp and I would recommend it to absolutely anyone looking for a good road-worthy head that they can depend on night after night.