Telefunken TF39 Copperhead Tube Condenser MicrophoneThis added feature set gives the TF39 greater flexibility and options in the studio. Sonically and component wise, the two microphones are otherwise the same. Circuit DesignThe TF39 features a new old stock American made 5654W vacuum tube, all brass K67 style capsule, and a premium Swedish made Lundahl output transformer. These components create a balanced frequency response and natural tonality, making the TF39 a trusty go to choice. Features