Bought used for about the same price as a new HA-2, this is a more substantial amplifier. The HA-2 is tiny, with a fiddly volume control. Plus the HA-20 has pass-through RCA sockets, which is useful if you don’t have line-level monitor outputs. The internal illumination is an odd choice, as there’s not much to see inside, but if the amp is out of line of sight, it doesn’t matter. The on/off button is a soft touch one, without a click, so perhaps the blue glow is useful to know when the amp is clearly on.
Although rated at only 0.1W (for each output) the HA-20 runs a stereo TEA2025 power op-amp with 12V rails, giving a theoretical maximum power of 2.4W per channel (into 8 ohms, it will be less into most headphones) which is more than sufficient. Volume attenuation is by an ALPS pot, smooth and with no channel discrepancies.
It drives my HD-650 headphones at least as well as my other ¥40,000~ valve-based dedicated headphone amp, and is a significant improvement on the basic headphone output of consumer-level audio components or televisions. Highly recommended if you can find one in good condition.
| メーカーにより製造中止になりました | いいえ |
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