incredulousity 1000+ Head-Fier incredulousity Aug 5, 2022 Audio Note 4300E 300B Positive paradoxper was the seller in this interaction. I purchased the Audio Note 4300B tubes for use with Feliks Envy. Cory is a great person to transact with. Product was as advertised, communication was ideal, shipping was prompt and with safe packaging. Highly recommended seller!