Yamamoto Sound Craft
"2A3" Single Stereo Amplifier A-011

The A-011 is a circuit that demonstrates 100% of the capabilities of the 2A3. Equipped with a double input volume, it is the simplest and most high-quality system, and you can connect a CD player directly to get the best quality. The A-011 consists of only one vacuum tube for both the driver stage and the output stage, so when a CD player is connected, the sound of the CD is played through only two vacuum tubes.

Improved sound quality by using 717A for the driver tube and "80" for the rectifier tube, which has good sound

In addition to using a regular preamplifier to control the level of the input, you can also connect not only a CD player, but also an analog equalizer amplifier or other input device if the gain is slightly larger.
The heater circuit of the 717A and 2A3 vacuum tubes uses DC ignition with double-wave rectification to minimize noise, and the rectifier uses an ultra-low-loss, high-capacity Schottky diode from International Rectifier of the United States, and the A-011 has an energetic and powerful sound due to its low impedance.

A toroidal power transformer with excellent regulation and a hy-bee type cut-core output transformer are used to achieve excellent sound.
Most of the capacitors, including the power supply used in the A-011, use carefully selected specially made film capacitors to reduce the use of chemical capacitors with inferior sound quality as much as possible. In addition, high-quality sound components such as DALE's winding resistors, metal-clad resistors, and large-capacity surface mount resistors are carefully selected for resistors. This unit is designed to achieve a maximum output of 4W with an input voltage of about 0.4V.