I have seen a bunch of forum posts saying you can change (with a few caps/resistors) a Princeton Reverb Reissue into a Custom 68 or vice versa. Here's a website that describes the differences: https://guitarampblog.wordpress.com/2017/01/26/fender-65-princeton-reverb-schematic-vs-68/ Can anyone confirm this? Of course they have different speakers. But aside from that, are there other differences? One thing that grabs my attention: the custom 68 is a 12W amp and the PRRI is 15W. Does this mean they have different output transformers as well? I see that the Custom 68 lists a Schumacher transformer, but I can't find any info on the PRRI transformer.