"By carefully optimizing the design and choosing the critical components carefully, Concert Fidelity's designer Masataka Tsuda achieved an exceptionally low noise floor for a 300B-based all-tube integrated DHT amplifier"
"Overall, the sound was highly detailed yet silky smooth and natural. As you'd expect from a high-sensitivity horn design being driven by 300B triode vacuum tubes, dynamics were lightning fast, with small subtle cues also being easy rendered. Concert Fidelity's sound system at T.H.E. Show Newport 2016 earns me award for producing one of the most classic and natural sounding high-end audio system." enjoythemusic.com T.H.E. SHOW Newport 2016 Report
The CF-i300B is an all-tube integrated amplifier featuring a pair of the 300B output tube driven by a pair of 6SJ7/6SJ7GT/5693. Rectification is handled by a 5AR4/GZ34. The directly heated triode amp outputs 9 watts/8ohm per channel. The circuit topology is extremely simple and signal paths are short. The CF-i300B has four sets of single-ended inputs and one of them can be switched to balanced (XLR). Users can select the speaker output impedance between 4 ohm and 8 ohm. As a bonus, it has a solid-state headphone amp which can drive either pair of a single-ended or balanced headphones.