This is a Tweed Princeton circuit in a Silverface Champ body and it sounds phenomenal.  To be clear, it is actually the exact Tweed Princeton 5F2A circuit, not just similar, it is the same.  The only significant addition we've made to the original circuit is to re-wire the now redundant bass pot as an NFB control.  Now you can decide how gritty you want it to be.  The volume & tone control  are as per the Princeton.  The speaker is an amazing Warehouse alnico, unbeatable tone.  You're getting a classic tweed circuit for a fraction of the price of a real one.  Very cool sounding amp, and a lot louder than you would expect!  Runs on UK voltage.