Cayin HA-1A MK3 Packs 2.7 Watts of Pure Tube Class A Into a Compact Headphone Amp

CanJam SoCal 2026 offered another reminder that personal audio has developed a rather elastic definition of “reasonable.” We listened to headphone systems approaching $57,000, while new amplifiers from Feliks Audio, Layer Audio Design and others demonstrated just how far manufacturers are willing to push dedicated headphone amplification.

Cayin is heading in the opposite direction with the new HA-1A MK3, the smallest member of its HA-series of tube headphone amplifiers.

Rather than combining a DAC, streamer, touchscreen and enough menu options to require a weekend seminar, the HA-1A MK3 is an old-school analog headphone amplifier built around a pure vacuum-tube, single-ended Class A circuit.

And that simplicity may be its strongest selling point.

The amplifier uses two JJ 12AU7/ECC82 tubes for voltage amplification and a pair of Electro-Harmonix EL84EH/6BQ5 output tubes. Cayin also uses custom-designed output transformers, point-to-point internal wiring and separate power supplies for the voltage and power-amplification stages.

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Small Box, Serious Tube Amplifier

At only 240 x 240 x 140mm (9.4 x 9.4 x 5.5 inches), the HA-1A MK3 occupies considerably less desktop real estate than many high-end tube amplifiers.

Do not mistake small for lightweight.

The transformers and metal chassis push its weight to 8.8kg, or roughly 19.4 pounds, which is substantial for something that takes up only about 9.4 inches in each direction.

Cayin provides both a 6.35mm headphone output and 4-pin XLR headphone output, along with selectable Low and High impedance settings. Low covers headphones from 8 to 150 ohms, while High is intended for models between 151 and 600 ohms.

That significantly broadens the potential headphone roster compared with traditional OTL tube amplifiers, which generally make the most sense with higher-impedance dynamic headphones.

The international launch materials rate output through the 4-pin XLR connection at up to 2,700mW + 2,700mW. Cayin’s current German product page lists 2,800mW + 2,800mW and 2,500mW + 2,500mW through the 6.35mm output, so there appears to be a minor regional specification discrepancy that Cayin will hopefully clarify before U.S. shipments begin.

There is also an important distinction regarding that XLR connection. Cayin describes it as a balanced headphone output, but the amplifier itself is specified as a single-ended Class A design. A 4-pin XLR connector should therefore not automatically be interpreted as evidence of a fully differential internal amplifier topology.

More Than a Headphone Amp

The HA-1A MK3 also includes two pairs of RCA inputs and a dedicated RCA preamplifier output, allowing it to control active loudspeakers or an external power amplifier.

Preamp gain is rated at 9dB with a maximum 5V output.

That makes the Cayin considerably more useful in a small desktop or two-channel system where the headphone amplifier might also serve as the analog control center.

An ALPS volume potentiometer, approximately 50-second delayed startup, automatic muting circuit and removable tube cage round out the package.

There is no DAC, Bluetooth or network streaming.

Good.

We already own enough products desperately trying to become computers.

Cayin HA-1A MK3 Specifications:

• Amplifier Type: Pure tube, single-ended Class A
• Tubes: 2 x JJ 12AU7/ECC82, 2 x Electro-Harmonix EL84EH/6BQ5
• Headphone Outputs: 6.35mm, 4-pin XLR
• 6.35mm Output: Up to 2.5W + 2.5W
• 4-pin XLR Output: Up to 2.7W + 2.7W in international launch materials
• Impedance Settings: Low 8-150 ohms; High 151-600 ohms
• Frequency Response: 20Hz – 24kHz ±3dB
• SNR: 110dB A-weighted
• Inputs: 2 pairs RCA
• Preamp Output: RCA
• Maximum Preamp Output: 5V
• Preamp Gain: 9dB
• Volume Control: ALPS potentiometer
• Dimensions: 240 x 240 x 140mm
• Weight: 8.8kg / 19.4 lbs
• Finishes: Black or Silver
• MSRP: $999

The Competition

The Feliks Audio Echo Vibe ($1,095) remains one of our favorite affordable tube headphone amplifiers, but its OTL architecture and 350mW output make it a very different proposition. It is particularly compelling with high-impedance dynamic headphones, whereas the Cayin’s transformers, selectable impedance ranges and substantially greater output power should make it suitable for a broader selection of headphones.

At $1,499, the Layer Audio Design GEN-300B features a single-ended Class A 300B circuit and can drive both headphones and efficient loudspeakers with up to 10 watts per channel through its speaker outputs. It is more ambitious as an integrated amplifier, but also considerably larger and heavier.

The Cayin occupies an interesting space between them.

It delivers a traditional transformer-coupled tube circuit, meaningful headphone output, wide impedance compatibility and preamp functionality without turning a desktop headphone system into a piece of living-room furniture.

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