First, the operating point of the 300B, while still within a safe zone, was nudged higher as far as plate voltage and current. Second, negative feedback (NFB) was applied to the input stage from the plate of the 300B, which accounts for the decent damping factor. Atasushi Muira, Air Tight’s founder, was aiming for an overall sonic presentation that he described as “tight and clear.”
The midrange is where tube magic happens and where the 300B kicks butt. Instrumental timbres were reproduced with exceptional transient and tonal fidelity to the real thing. But it wasn’t just about accuracy and detail resolution. The music flowed with passion, dramatic flair, kinetic drive, and glorious harmonic textures that put other SET amps to shame. Stringed instruments from violin to double bass sang with a lyrical tone.
It consistently brought to life the full sonic promise of the 300B, and fully justified its reference appellation. Its performance rests on four major sonic pillars working in synergy: velvety textures, remarkable timbre fidelity, superb soundstage transparency and image focus, and a satisfying bass foundation.
Simply put: an awesome display of the power of the first watt!