Allnic HPA-300B Rør Hovedtelefon ForstærkerMain features 1. All new damper sockets in signal path Allnics employed 9pin MT damper socket for decades, but in consideration of importance of microphonic noise free for headphone amplifier, newly developed 300B US 4 pin damper socket. Now all tubes in signal path operate floated on liquid rubber free from microphonic noise. 2. For powerful drive attack to 300B, Allnic uses choke transformer drive method which shows both good points between CR and