Belvidere$2950 base price Who doesn't love '50s tweed amps?? They are a favorite here at Keytone Amps! We asked ourselves, "How can we take some of these old, classic designs and make something cool, compact, & RELEVANT?" We, proudly, introduced the Keytone Amps Belvidere! It's been a year or so in the making. How did we answer the proposed question? Well. we took elements of the classic 5F4 & the 5E5 and combined them. We didn't just stop there though.