FX-Audio TUBE-02 PRO Double JAN5725W Tube Class A Headphone Amplifier AMPProduct Features: 1. TUBE 02PRO is a tube headphone amp,which uses 5725 tubes to amplify signal. lt has a strong tube flavor, fine tone, and high performance. 2. The design is novel,and the variant amplification ofinternal transistor and electron tubeis processed by tube output, which solves the trouble ofpluggingin and out when enthusiasts use multiple sound sources. 3 . With high gain mode,the gain can beincreased by+2. 5dB. The tube can be replaced