Meet the successor to a modern classic. HA-6A MK2 keeps the musicality of the original 6A and adds a dedicated outboard power supply for an even blacker background, plus a new pre-out so it can moonlight as a tube preamp in your main rig. 

Why we like it (ZMF Notes)

After loving and usually preferring the OG Ha-6A to it's 300B counterpart I couldn't wait to hear the MKII. This MK2? Shockingly quiet—at least on par with the HA-3A amp to my ear—and with a simple tube swaps this is the most versitile of the Cayin amps. If you prefer something a touch quicker and less “heavy” than a 300B presentation, the 6A MK2’s Triode/Ultralinear switch and KT88/EL34-family flexibility make it a joy to tune. Three impedance settings let you dial in synergy from hard-to-drive planars to our most sensitive dynamics, and it pairs wonderfully with ZMF:

• Triode for saturated tone and long-session ease and fluidity

• Ultralinear when you want extra snap and staging energy.

Highlights

• Dual-chassis design: separate amplifier and power-supply enclosures minimize magnetic interference and lower the noise floor. Hand-wired, point-to-point signal path. 

• Two operating modes: Triode (silky, organic) or Ultralinear (more drive and control) at the flip of a front-panel switch. 

• Broad tube compatibility: ships with Genalex KT88 power tubes and supports 6550, KT66, KT150 and others; input/rectifier stages use ECC82/12AU7 and GZ34/5AR4. Easy rolling for fine-tuning. 

• Versatile I/O: balanced XLR and RCA inputs; headphone outputs on 4-pin XLR, 4.4 mm, and 6.35 mm; plus RCA pre-out to use as a tube preamp. 

• Power on tap: up to 4.5 W/ch (4-pin XLR, UL), with selectable Low/Mid/High impedance matching (8–600 Ω), making it at home with both efficient dynamics and current-hungry planars. SNR 104 dB (A-weighted) keeps hiss at bay. 

Tech Specs (MK2)

• Tube set: 2× ECC82/12AU7, 2× Genalex KT88, 2× GZ34/5AR4. 

• Outputs: 4-pin XLR (UL 4.5 W/ch, TR 3.0 W/ch), 4.4 mm (UL 1.0 W/ch, TR 0.65 W/ch), 6.35 mm (UL 3.5 W/ch, TR 2.3 W/ch). 

• Inputs: 1× XLR, 1× RCA. Pre-out: 1× RCA (max 6 V, +20 dB gain).

• Impedance switch: L / M / H (8–600 Ω). SNR: 104 dB (A-wtd). FR: 10 Hz–26 kHz (±3 dB). THD: 0.3% @ 1 kHz/200 mW. 

• Chassis: AMP 285×297×185 mm (11.2 kg) / PSU 160×297×185 mm (8.2 kg). Includes aluminum remote (volume/mute). 

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