The gentleman who invited me to play yesterday had a silverface Princeton (and original one) that he had modded and even put a 12" speaker into. Absolutely killer. The venue had it mic'd so it was plenty loud enough but I really dug the idea of this sort of Princeton with the 12" speaker. He had a custom made Weber that put a Jensen-style speaker into a Celestion frame so that it would actually fit in the amp. With the amp halfway up I just used my volume knob for leads. When I was told to turn down by the sound man (who I don't think was very experienced at running sound for live bands in a venue like this) I ended up using my Scott Henderson RC Booster. I dug it. Very different from my silverface Deluxe with the Celestion in it.