Yamamoto Sound Craft
"2A3" A-011 power amplifier

The A-011 is the simplest and highest quality system with a dual input volume, allowing you to connect a CD player directly to the A-011. When a CD player is connected to the A-011, the sound of the CD is reproduced through only two tubes.

The 717A driver tube and the "80" rectifier tube are used to improve the sound quality.

The CD player can be used with an ordinary preamplifier to control the input level, and an analog equalizer amp or other input devices can also be connected if the gain is slightly higher than that of the CD player.
The heater circuit of the 717A and 2A3 tubes uses double-wave rectification DC ignition to minimize noise, and the rectifier uses ultra-low-loss, high-capacity Schottky diodes manufactured by International Rectifier of the U.S. The A-011 has a powerful and energetic sound due to its low impedance. The A-011 has an energetic and powerful sound due to its low impedance.

A toroidal power transformer with excellent regulation and a high-beam type cut-core output transformer are used to achieve excellent sound.
Most of the capacitors used in the A-011, including the power supply, are carefully selected specially made film capacitors to minimize the use of chemical capacitors, which are inferior in sound quality. Also, the resistors are carefully selected high-quality sound parts such as DALE wire-wound resistors, metal-clad resistors, and large-capacity surface-mount resistors. The amplifier is designed to provide a maximum output of 4W at an input voltage of approximately 0.4V.