6X4 EZ90 Ser-D Getter NOS Swedish Made

RARE NEW OLD STOCK SWEDISH RECTIFIER TUBE 💎 Premium vintage 6X4 / EZ90 rectifier tube in factory-new, unused condition, preserved in original stock. An excellent choice for restorations, upgrades, and collectors seeking authentic European tube quality. Tube Details and Codes 📌 • US Tube Type: 6X4 • EU Tube Type: EZ90 • Factory Marking: Ser-D Getter • Origin: Made in Sweden • Condition: New Old Stock, unused Testing and Performance ⚡ • Verified unused inventory stock • Clean, original presentation with no signs of prior use • Ideal for high-end tube rectifier applications • Suitable for collectors and vintage audio restorations Sonic Signature 🎵 • Smooth, refined rectification with stable power delivery • Supports a quiet background and natural musical flow • Excellent foundation for rich, dimensional tube sound