Cayin HA-300B MK III

Ships in 4-8 weeks.

A few years ago I acquired my first 300B headphone amp in the Glenn 300B. Legend has it only a few of these exist, and it will never leave my collection. The sound is an intoxicating mix of heft, airy extension, and a 3D soundscape unlike any other tube. I have a couple other 300B amps, as I've come to love the "only a 300B can sound this way" sound. All of them have their unique timbre.

In an effort to share that 300B magic with ZMF owners, we're now carrying the Cayin HA-300 MK III, the third generation of Cayin's flagship and a real step forward from the MK II we've loved. My takeaways after running it through its paces:

• Dead quiet, even more so than the MK II, and still unheard of for a 300B amp
• Massive range: sensitive IEMs all the way up to Susvara and HE6, all driven with ease
• Classic 300B weight and euphonic harmonics, now with even better clarity and grip
• A tube roller's dream: the new GZ34 rectifiers open up a whole new layer of rolling on top of the 6SN7 input tubes

Still a pure Class A single-ended triode design with Genalex Gold Lion PX300B outputs and 6SN7 drivers, and still that dreamy, holographic 300B presentation, just with more headphones it'll sing with and a cleaner, more flexible path to get you there. An exciting amp, and absolutely worthy of the ZMF sound.

• Pure Class A single-ended triode: Genalex Gold Lion PX300B outputs, 6SN7 drivers, GZ34/5AR4 rectifiers
• Power supply rebuilt around GZ34/5AR4 rectifier tubes (replacing the NOS tubes of the MK II) for wider rolling flexibility and cleaner delivery
• Upgraded amplification stage: up to 6,500mW on 4-pin XLR, plus a 4.4mm output optimized for low-noise IEM use
• Third-generation wide-bandwidth EI output transformers, Duelund coupling capacitors from Denmark, point-to-point hand wiring
• Every unit ships with hand-matched tubes and 48 hours of factory burn-in