I'm a new owner of an 8 watt per channel BEZ Model T3B class-A, zero negative feedback, 300B SET power amplifier...another fine example of DIY home-built 300B topology by Edmund Lam. Tubes consist of new graphite Shuguang 300BCs, NOS '40s Delco (RCA) 6J7GT drivers, and a 1951 Sylvania 5U4G rectifier. With point-to-point wiring and beefy hand-wound Ei power/output transformers, this straightforward single-ended design is both functional and musical, and also affordable. Highly recommended!