R40-TS4390A 40VA Tube Preamp R-Core Transformer Real Product Photo with OFC Copper Shield

R-Core & Audio Transformers · R-Core Power Transformers

R40-TS4390A 40VA Tube Preamplifier R-Core Power Transformer

40VA specialized vacuum tube preamplifier R-Core power transformer (Model R40-TS4390A). Features annealed OFC copper perimeter flux shielding, 220V primary with ground lead, high-voltage center-tapped secondary (200V-0V-200V / 0.04A) for vacuum tube plate supply, dual 6.3V filament windings (1A & 1.5A), and 8V / 1.3A auxiliary supply. Certified zero hum and <5 mG stray flux leakage.

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Especificaciones Técnicas

Power Rating 40 VA
Model Number R40-TS4390A
Primary Input 220 VAC 50/60Hz (Red-Red Leads)
Earth Ground / Shield Yellow/Green Ground Lead connected to OFC Annealed Copper Band
Secondary High-Voltage B+ 200V - 0V - 200V / 0.04A (Yellow - Green - Yellow Center-Tapped)
Secondary Filament Rail 1 6.3 VAC / 1.0A (Orange-Orange)
Secondary Filament Rail 2 6.3 VAC / 1.5A (White-White)
Secondary Auxiliary Rail 8.0 VAC / 1.3A (Blue-Blue)
Core Construction Nippon Steel High-Permeability Silicon Strip Continuous Circular Core
Magnetic Flux Leakage < 5 mG (Near-Zero Stray Field, Ideal for Sensitive Phono/Preamp Stages)
Shielding Band Heavy Annealed OFC Oxygen-Free Copper Foil Perimeter Band
Dielectric Withstand 4,000 V AC Primary-Secondary Test Passed
Dimensions (L×W×H) 84 × 74 × 50 mm
Mounting Centers 74 × 58 mm
Net Weight 0.85 kg
Production Facility Hefei XinHuan Transformer Co., Ltd. (Precision Audio Division)

Información del Producto

Estado

Publicado

ID del Producto

XH_R40_TS4390A_TUBE_PREAMP_R_CORE_TRANSFORMER

Última Actualización

2026-10-09T06:28:57.380408+00:00

Technical Highlights

  • Outer perimeter wrapped with authentic annealed OFC oxygen-free copper foil shielding band to prevent 50Hz/60Hz electromagnetic hum pick-up in high-gain tube stages.

Application Scenarios

  • Class-A tube preamplifiers, moving-magnet/moving-coil phono preamps, headphone amplifiers, and vintage audio restorations.

Key Features

  • 40VA audiophile vacuum tube preamplifier transformer with high-voltage B+ secondary (200V-0V-200V @ 40mA center-tapped).
  • Dual dedicated 6.3V filament heater rails (6.3V 1.0A + 6.3V 1.5A) designed specifically for 12AX7, 12AU7, 6SN7, and 6922 vacuum tubes.
  • Auxiliary 8.0V 1.3A rail for rectified relay control, display circuitry, or solid-state input selector stages.

Preguntas Frecuentes

Inquire with your required filament and B+ high voltage rail requirements for custom winding adjustments.

Manufactured to IEC 61558-1 / UL 5085 standards. 4,000V AC dielectric withstand tested. Flame retardant Class B insulation.

Factory direct foam carton packaging. Worldwide express courier or air freight.

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Normas y Cumplimiento

Manufactured to IEC 61558-1 / UL 5085 standards. 4,000V AC dielectric withstand tested. Flame retardant Class B insulation.

Embalaje, Entrega y Servicio

Factory direct foam carton packaging. Worldwide express courier or air freight.

Inquire with your required filament and B+ high voltage rail requirements for custom winding adjustments.

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