The Sangaku
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"Sangaku” is one of many words that means
“Mountain” in Japanese. It is also the name of a national park in Japan that
encompasses part of the “Japan Alps”, a beautiful mountainous area in central
Honshu.
The Sangaku headphone amplifier is a tube hybrid
headphone amplifier (meaning that it uses both vacuum tube and solid-state
technology). It employs the “NuTube” device from Korg Incorporated in
Japan, which is a newly developed dual triode vacuum tube. The NuTube
device provides true directly-heated triode characteristics in a small package.
It requires very little power, at lower voltages, than other tubes. This
enables the Sangaku to provide true DHT sound at an unprecedented small size and
low cost.
For more information about the NuTube, please visit
Korg at
www.korgnutube.com.
In the Sanguku circuitry, the NuTube device is used
in a single-ended configuration to provide the needed voltage gain.
Solid state buffers provide both unbalanced and balanced outputs with a very low
output impedance to drive the headphones. The Sangaku can drive any
headphones, from 16 ohms to 600 ohms, and has enough gain for even inefficient
headphones.
To keep the footprint small and the audio path
direct, all audio switching and routing is done using relays, and control is
done with simple buttons on the front panel.
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Measurements and Specifications
NOTE: Please read the page about headphone & amp specs!
Values are typical.
Power input:
115-125V or 230-250V, 50-60Hz, 25W maximum
Dimensions:
8.75” wide x 10” deep x 2.4” tall (including
knobs, connectors, and feet)
Inputs: Three - one balanced input (3-pin XLR jacks), two
unbalanced (RCA jacks)
Outputs:
Three - unbalanced headphone (1/4” jack), balanced
headphone (4-pin XLR jack), and unbalanced line out (RCA jacks)
Download the Sangaku user manual