(this kit includes best in class Takatsuki TA-2A3 tubes, from the only tube manufacturer in Japan)

The Sun Audio SV-2A3 is a high-fidelity, single-ended triode (SET) amplifier kit, designed for audiophiles who appreciate both the art of DIY assembly and the unparalleled musicality of the legendary 2A3 tube.

This is a kit, not a finished product. It includes all necessary components for assembly, including Tamura transformers, chassis, and premium-quality parts, but requires soldering and technical knowledge to complete.

Pure 2A3 SET Sound – A True Audiophile Experience

The 2A3 triode is revered for its warm, natural tone, exceptional midrange clarity, and highly immersive presentation. Designed for high-efficiency speakers, the SV-2A3 delivers an intimate, detailed, and emotionally engaging listening experience.

Kit Features & Design
• This is a DIY kit – Assembly required; includes all necessary components. Includes Takatsuki TA-2A3, JJ Electronic 6SN7 and General Electric 5AR4 tubes.
• Single-Ended 2A3 Triode Design – Produces 3.5W per channel in pure Class A operation.
• Tamura Transformers – Featuring Tamura-made power and output transformers for superior sonic transparency and dynamics.
• Hand-Wired, Point-to-Point Construction – Traditional Japanese craftsmanship designed for sonic purity and reliability.
• Minimalist, High-Purity Circuit – Carefully designed to preserve every nuance of your music with low distortion.
• Tube Rolling Capability – Compatible with various 2A3 tubes, allowing customization of the amplifier’s tonal characteristics.

Specifications
• Circuit Type: Single-Ended Triode (SET), Class A
• All triode tube circuit
• Output Power: 3.5W + 3.5W (at 8Ω)
• Frequency Response: 20Hz – 20kHz (+/-1dB)
• Input Sensitivity: 0.7V for full output
• Input Impedance: 100kΩ
• Output Impedance: 8Ω / 16Ω (selectable)
• Power Consumption: ~75W
• Dimensions: W350 × H195 × D230mm
• Weight: 13kg

This is a Kit – Assembly Required

The Sun Audio SV-2A3 is only available as a DIY kit. It is intended for experienced builders who are comfortable with soldering, circuit assembly, and high-voltage electronics. No finished or pre-assembled version is available.

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Takatsuki Electric Industry, which manufactures audio vacuum tubes in Japan, has released the directly heated triode tube "TA-2A3". The company, which revived vacuum tube manufacturing in Japan with the release of the TA-300B in 2010, has added the famous tube 2A3 to its lineup as its first new vacuum tube product in the 10 years since the release of the TA-274B in 2012. As the "TAKATSUKI" brand, which is highly regarded by audiophiles around the world, the TA-2A3 vacuum tube delivers high quality and precise sound.