Difference between a Princeton Reverb and a Princeton?

I was just hunting around on ebay, and noticed that Princeton Reverbs can go fro over $500 while Princetons I can find for under $300. What's the difference between the two?

Not trying to be a wise guy, but it's the reverb.

They sound pretty much the same, otherwise.

More gain in the PR and the obvious..

The Princeton will stay clean pretty much all the way up the dial and it isn't quite as loud. I would say that the Princeton is the same volume when it's dimed as the PR is when it starts to crunch.

So it's basically separated by gain and reverb? Thanks! Just a quick question...

The gain difference is quite substantial between the reverb/non-reverb Princetons. The PR adds the usual reverb mixing stage which adds more than 10dB of gain.

If you want to play fairly clean, a non-reverb unit will do. For the additional overdrive that many desire, the reverb model is much preferred.