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The Cayin HA-1A MK3 is a compact Class-A tube headphone amplifier and preamplifier built around 12AU7/ECC82 and EL84/6BQ5-family vacuum tubes. Dedicated power and output transformers support its fully analog signal path, while selectable headphone impedance matching and 6.35 mm or 4-pin XLR outputs provide flexibility across a wide range of headphones.
The HA-1A MK3 uses two JJ 12AU7/ECC82 tubes alongside two Electro-Harmonix EL84EH/6BQ5 tubes. Its vacuum-tube circuit is designed around the tonal density, smooth character, and expressive presentation associated with Cayin’s dedicated tube amplifiers.
Class-A amplification keeps the output stage operating continuously through the signal cycle, prioritizing linear operation over maximum efficiency. Cayin has tuned the HA-1A MK3 for detail, dynamics, tonal weight, and comfortable extended listening across a broad range of music.
Cayin developed dedicated power and output transformers specifically for the HA-1A MK3 circuit. Separate power-supply sections and a carefully arranged internal layout provide a stable electrical foundation while helping reduce unwanted interference within the amplifier.
A two-position impedance selector accommodates headphones with different electrical requirements. The Low setting supports 8–150 ohms, while the High setting covers 151–600 ohms. This allows the amplifier to work with low-impedance planar magnetic headphones as well as higher-impedance dynamic designs.
The front panel provides a 6.35 mm single-ended headphone output rated at 2,400 mW + 2,400 mW and a 4-pin XLR balanced output rated at 2,700 mW + 2,700 mW. Both connections give users practical flexibility when pairing the amplifier with different headphone cables and terminations.
A rear-panel RCA PRE-OUT allows the HA-1A MK3 to serve as a tube preamplifier for active loudspeakers or an external power amplifier. With two pairs of RCA inputs, the amplifier can sit at the center of a compact desktop audio system while handling both headphone and speaker-based listening.
An ALPS volume potentiometer joins the custom transformers and dedicated power-supply sections inside the chassis. Cayin combines these components with hand assembly and inspection as part of its established tube-amplifier manufacturing approach.
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