I've played an original 5F1 - although, after many years I have no idea what's changed inside. And I owned EC Vibrochamp, which is a 5F1 with tremolo - turn it off and it's a 5F1. The old amp had that 'aged aural patina' old speakers drifted components have - that air, if you like. But the new amp certainly caught the single ended vintage vibe. Stick to the low voltage taps and don't mod the hell out of it and it's a great, obnoxious, splatty one knobber that will teach you a lot about how guitar controls interact with a simple amp. I sold it because I could make a buck on it and was a bit disappointed with Fender build but I have bits to make another. Not for everyone.