Purity Audio Design 300B Ultra Mono Bloc amplifiers--18 watts of glorious parallel SET sound per amp utilizing the 300B tube with 6SN7 driver tubes and 5U4GB tube rectification. Truly, one of the best sounding SET amplifiers at any price, the parallel SET design affords more power output and greater dynamic headroom. Only reason for selling is that I am downsizing my system I have conservatively rated them 8/10 but they are closer to 9/10. Tubes with low hours (<200). Included are Sophia 300B power output tubes and NOS rectifier and driver tubes. I will cover shipping and insurance costs in CONUS and PayPal fees. Please see my ad for the Purity Reference preamp as well--I will offer a package price if you are interested in the preamp and amplifier pair. Thanks for looking!