2026 NEW Shuguang Tube 2A3B(2A3C,2A3)Amplifier HIFI Audio Vacuum Tubes

The 2A3B is an improved version of the 2A3, introduced by Shuguang Tube Factory in 2004; it belongs to the category of directly-heated triode power tubes and was designed specifically for HIFI amplifiers, allowing it to be used as a direct replacement for the traditional 2A3/2A3C tubes.

The vocal sound is sweet and smooth, with delicate mid-frequencies and a natural sound field – the typical characteristics of a \”tubular\” speaker. It has fewer issues of being harsh or piercing compared to cheap alternatives to the 2A3; harmonic distortion can be reduced to below 0.5%, making it suitable for genres such as classical music, jazz, and solo vocal performances where emotional expression is important.

Current through the filament
If…………………………………………………..2.5       A

Maximum allowable values
Ua………………………………………………..300       V

Pa………………………………………………….25       W

Capacitance between the electrodes
Input capacitance………………………………………..7.5       PF

Output capacitance………………………………………..5.5       PF

Capacitance across the circuit……………………………………….16.5      PF

Static parameters
Ua………………………………………………….250       V

Ug………………………………………………….-45        V

Ia………………………………………………….. 60       mA

Gm…………………………………………………5.25  mA/V

ri……………………………………………………..0.8       kΩ

μ……………………………………………………4.2

Pou………………………………………………….3.5       W