AST-5881sSTK Vacuum Tube Stereo Single Power Amplifier

Astro Electronic Planning, a manufacturer of vacuum tube amplifiers, has created a new series for beginners in vacuum tube audio. By narrowing the width and reducing the size of the amplifiers, they are lighter and easier to handle, and AST's STK series uses the company's first original internal circuit board to simplify manufacturing and reduce production costs and time.

The original AST electronic board is designed with thicker wiring than normal boards, which contributes to the amount of information and sound quality. In addition, by using the company's original design transformer, which is no less than the high-grade Hashimoto transformer, the price was successfully kept down without sacrificing sound quality. By carefully crafting each tube amplifier one by one, our tube amp craftsmen have created a sound quality with expressiveness and power that will satisfy not only beginners but also enthusiasts.

There are two inputs, allowing you to connect a CD or other music player directly without a preamplifier to enjoy authentic vacuum tube sound. In addition, LEDs are installed in the tube inserts to provide a new visual effect never before seen in tube amplifiers.

The AST-5881sSTK is equipped with a self-bias function that automatically performs the troublesome bias adjustment. You can enjoy the difference in sound quality of each tube by replacing the compatible tubes.

The self-bias capacitor used in the AST-5881sSTK has a higher capacitance of 470 microns than the 100~200 microns used in most amplifiers in the same price range. This allows the sound to be expressed well even when the volume is turned down, whereas most amplifiers cannot express sound properly when the volume is turned down. The left and right independent volume controls allow for fine volume adjustment, making it easy to enjoy high-quality music played by vacuum tubes.

The input terminals are high-grade gold-plated terminals, and the speaker terminals are machined aluminum gold-plated terminals that are compatible with various speaker terminals, making this a full-fledged model that is compatible with speakers ranging from 4 to 8 ohms.