Ships in 4-8 weeks
Cayin HA-300 MK III — 300B Tube Integrated Amplifier
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
What's new in the MK III: Cayin rebuilt the power supply around GZ34/5AR4 rectifier tubes (replacing the NOS tubes of the MK II) for wider rolling flexibility and cleaner delivery, and upgraded the amplification stage for noticeably stronger drive — up to 6,500mW on 4-pin XLR, plus a newly optimized 4.4mm output tuned for low-noise IEM use. New third-generation wide-bandwidth EI output transformers, DUELUND coupling capacitors from Denmark, and point-to-point hand wiring round out the build. Every unit ships with hand-matched tubes and 48 hours of factory burn-in.
Still a pure Class A single-ended triode design with Genalex Gold Lion PX300B outputs and 6SN7 drivers — 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.