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High End Stereophile recommended triple use tube amplifier

Numerous overseas awards from UK, USA, EU and Asia

Can be used as integrated amplifier or headphone amplifier

Can also be used as a 14db gain tube pre amplifier

1 x 12AX7 + 1 x 12AU7 for pre-amplifier stage

EL84 x 2 vacuum tubes for power output stage

Silver plated high purity copper internal signal wiring

Special handmade low magnetic leakage toroidal power transformer

Special handmade wide frequency response Ei audio transformers

Ultralinear / Triode mode selection

All point to point wiring (hand soldering)

Detachable power cord system (IEC)


As Headphone Amplifier:

Input impedance: 22K Ohm

Output impedance: 6 Ohms – 300 Ohms, switchable

Power output: 1W Triode RMS

Input sensitivity: 320mV

Frequency response: 25Hz-30kHz

THD: 1%

S/N ratio: 88dB

Channel balance: 0.5dB

As Integrated Amplifier:

Input impedance: 22K

Output impedance: 8

Power output: 1.2W RMS, Triode,2.2W RMS, Ultralinear

Input sensitivity: 320mV

Frequency response: 25Hz-30kHz


S/N ratio: 85dB

Channel balance:0.5dB

As Preamplifier:

Input impedance: 22Kohms

Frequency response: 15Hz-40kHz

THD: 0.8%

Output: 2000mV (Max 4000mV)

S/N ratio: 82dB

Total gain: 14dB

Power Consumption: 60VA maximum

Dimension W x H x D : 5.25 x 9.25 x 12 inches

“The HA-1A breathes life and light into music in a way that transistors— and many tube amps—simply cannot. It makes musicians sound here, not there. This is what SET can do: not transport you to the recording venue, but transport the performers to your living room… Immediacy, intimacy—nothing can top tubed SET. Those experts who opine that all hi-fi sounds “electronic” haven’t spent much time around SET tube amps. I doubt that the HA-1A works its magic by fooling with phase relationships or blending channels. What it does, it does naturally: expand the soundstage so that it floats outside, not inside, one’s cranium. The effect is not as natural as listening to a good pair of loudspeakers, but the experience is enjoyable on its own terms. The HA-1A has a way of making headphones sound less like cans (British slang for headphones) that is downright…uncanny. And the HA-1A did bass—rich, full, tuneful, tight bass. I’ve always thought my Sennheiser HD 600s sounded a little thin and bass-shy. Such is not the case. The HA-1A may be the best thing that’s ever happened to headphones. Of course, you’ll need a good CD source to reap the maximum benefits, but the sound quality I heard was extraordinary. You can have more than a taste of high-end bliss for relatively little money—champagne sound for beer-budget bucks. Man, you gotta hear it!”

Sam Tellig, Stereophile June, 2006

Stock Availability Status: UPGRADED TO HA-1A MK2