ST-300A SE Mono Tube Amp 8W Kit

ST-300A DIY Mono Tube Amplifier Kit

Build your own high-quality ST-300A mono tube amplifier with this complete DIY kit. Designed for audiophiles and tube amplifier enthusiasts, the ST-300A delivers excellent frequency response, clear detail, and the warm, natural sound that makes tube amplification so appealing.

The kit features a premium toroidal power transformer and two toroidal output transformers. Compared with traditional EI-core transformers, toroidal transformers provide higher efficiency, lower magnetic leakage, reduced hum and noise, and excellent channel separation for clean, detailed audio reproduction.

For easy assembly and a professional finished appearance, the kit includes a pre-finished amplifier chassis, IEC power inlet with EMI/RFI filtering, and power switch. With the essential components included, the ST-300A gives DIY enthusiasts an excellent foundation for building a high-performance stereo tube amplifier at home.

 Compatible Components
 Output Transformer: MS-30W50, MS-30W75 or MS-30W25
 Power Transformer: AS-2TB300 
 Tube Sockets: 8-pin ×2 (for KT66,KT88, KT-120 and 6SN7)
 IEC Power Inlet: CW2B-10A-T (included)
 Main PCB: STA-300B PCB 
 RCA Connectors: Panel-mount ×1
 Speaker Connectors: Panel-mount ×3
 Tubes: 300B and 6SN7 
Package Includes
 Main chassis & bottom plate
 Main ST-300B PCB 
 AS-2TB300 Power transformer & CA-201 Cover
 MS-30W50 transformer (add note to change)
 Regulated 5V filament module
 IEC power inlet with fuse and switch
 6Vac green power LED
 Screws, feet and spacers