Features The HA-S is a kit to assemble a hi-fi headphone amp that utilizes a Korg Nutube vacuum tube. Although this headphone amp is powered with only two batteries, it can drive the Nutube with a line voltage of 26 V for an authentic vacuum tube sound. The filament is powered by a DC to DC converter, which consumes less electric current. An NFB (negative feedback) switch is used, which lets you switch the NFB circuit on and off as you like. The headphone amp output uses an IC socket, which allows the operational amplifier to be replaced. Two types of operational amplifiers are included. The Nutube anode load resistance value can be adjusted, letting you enjoy different sounds by changing the steepness of the load curve for the vacuum tube. This unit is shaped like a mint can case, which is familiar to fans of these kinds of cases. —The unit also includes a protector for the power switch. An acrylic cover is provided that features the Nu:Tekt design, letting you see the light from the Nutube through the cover. Specifications Vacuum tube: Nutube 6P1 Connectors and jacks: IN jack (stereo mini phone jack), jack (stereo mini phone jack) Controls: Volume, NFB switch (internal) Output impedance: 10O; recommended load: 15O or greater Power: AA alkaline batteries (sold separately) Battery life: Approx. 9 hr. (using alkaline batteries) Dimensions (W x D x H): 111 x 65 x 29 mm / 4.37 x 2.56 x 1.14 Weight: 110 g / 3.88 oz. (without batteries) Included items: Owner’s Manua WATCH: Nu:tekt HA-S: Nutube Headphone Amplifier Kit
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