Cayin HA-300 Heaphone Amplifier

Cayin's HA-300 came about as an 18 month expedition to create a headphone amplifier that would meet the expectations of audiophiles.

To deliver on that promise, the HA-300's circuitry was designed to utilize the musical fidelity of the 300B tubes, powered by custom-built transformers to create perfectly balanced output through the headphones. The amplifier also utilizes a two-box design; a dedicated tube-controlled power supply and the amplifier. To add to Cayin's traditional high standards of quality, this amplifier is built with US-Aviation grade electrical plugs and RC22DE4 rectifier tubes to provide clean DC power to the 300B tubes. All in all, the HA-300 amplifier is a powerful workhorse that will live up to the hopes of audiophiles.
Review by Dave Hanson

Technical specifications:

Device: 300B Tube Headphone Amplifier
Input Connectors: XLR or RCA
Tubes: 2 x 300B, 2 x 6SN7, x 4 x 22DE4
Frequency range: 10 Hz - 60 kHz (+/- 3 dB)
Total harmonic distortion (THD): 1% (1 kHz)
Unweighted signal-to-noise ratio: 100 dB
Input impedance: 100 kOhm
Input sensitivity: 440 mV
Output power (RMS): 8W + 8W Class A
Input power: 120 VAC
Dimensions: Amplifier: 286mm x 368mm x 210mm
PSU: 59mm x 345mm x 210mm
Weight: 75lb