Description

SU50 Pure Class‑A High‑Power Amplifier Board Kit (1 Set‑2 Boards) | Balanced Input

Build your premium‑grade Hi‑Fi stereo amplifier with our SU50 Class‑A power amplifier board kit. This high‑performance combined amplifier features double‑sided thickened gold‑plated FR4 PCB, 2‑mm‑thick substrate and 70‑μm copper foil, delivering ultra‑stable circuit performance and excellent signal transmission.

Built‑in multi‑protection speaker circuit covers delayed startup, mid‑point voltage protection and over‑current protection to safeguard your speakers effectively. Adopting heavy‑current wiring and tree‑shaped grounding design, the board achieves an ultra‑high signal‑to‑noise ratio for clean, low‑noise audio output.

Core Components

• Output Transistor: 3 pairs of brand‑new genuine 2SC3264 / 2SA1295 audio‑specific power tubes per channel, idle current: 100mA per tube

• Drive Tube: 2SA1837 / 2SC4793

• Op‑amp (Optional): LME49720NA or JRC4580DD

• Coupling Capacitor: Non‑polarized polypropylene MKP capacitor

• Resistor: 718 factory metal‑film resistor

• Electrolytic Capacitor: High‑temperature resistant electrolytic capacitor

• Relay: Original Ω‑dragon 16A contact relay

• Audio Input: Supports balanced input for improved sound quality

Amplifier Board Specifications

• Board Dimension: 240mm × 100mm

• Working Voltage: DC ±50V

• Output Power  • Class‑A: 30W+30W  • Class‑AB: 150W+150W @ 8Ω, 300W+300W @ 4Ω

SU50 Rectifier & Filter Power Supply Board

Comes matched for your stereo build. Double‑sided gold‑plated FR4 PCB (2mm substrate, 70U copper foil). Equipped with Xiantong 30A fast‑recovery rectifier diodes, it can hold up to 4 capacitors with a maximum diameter of 35 mm.

• Included Parts: 4pcs brand‑new genuine 63V 10000UF electrolytic capacitors

• Power Board Size: 103mm × 72mm

Note: One set contains 2 amplifier boards, enough for a complete stereo amplifier system.

Important Notice

1. This is a loose‑component DIY kit. Soldering assembly is required.
2. Circuit schematic diagrams are NOT provided for this amplifier board. Please do not contact us to request schematics. Do not purchase if you cannot accept this condition.

Perfect for Hi‑Fi audiophile DIY projects, home stereo audio builds and custom high‑fidelity amplifier construction.