Ready to Proceed?
Request a Firm Quotation for R40-TS4390A 40VA Tube Preamplifier R-Core...
Share your project specifications and receive an official CIF quotation within 24 hours.
R-Core & Audio Transformers
R-Core Power Transformers
SKU: XH_R40_TS4390A_TUBE_PREAMP_R_CORE_TRANSFORMER
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.
Compliance Standards
IEC • ANSI • IEEE • GB
Quality Inspection
100% FAT Routine Tested
Engineering CAD
2D CAD / SLD Schematics
Global Logistics
Direct Seaport CIF Export
Engineering Datasheet
Technical Parameters & Ratings
| 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 |
| Factory Hotline | 13696514019 / Hefei XinHuan Transformer Co., Ltd. |
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.
Engineering Submittal & Layout Workbench
Substation Room Fit & Multi-Equipment CAD Footprints
Select your equipment type and capacity to inspect verified GA engineering CAD line drawings, Single Line Diagrams (SLD), dimensions (L × W × H), roller gauge, and submittal clearances before procurement.
Available Ratings:
11kV / 33kV Dual Voltage
IEC 60076 / IEEE Compliant
100% Routine Factory Tested
Export Nitrogen / Seaworthy Pack
1000 kVA Technical Dimensions
IEC 60076-1International utility & industrial submittal specifications
| Overall Length (L) | 1,750 mm |
|---|---|
| Overall Width (W) | 1,120 mm |
| Overall Height (H) | 1,780 mm |
| Roller Wheel Track Gauge (D) | 820 mm |
| Total Equipment Net Weight | 3,820 kg |
| Min Substation Clearance | 1,000 mm surrounding |
| Rated Voltage / System | 11 kV / 33 kV Dual Primary |
| Applicable Standard | IEC 60076-1 / IEEE C57 |
Download Technical Data Sheet (PDF)
Request Factory Engineering Submittal Package
Full CAD DXF/DWG vector footprints, 3D STEP models, and custom project submittals provided within 2 hours upon request.
XinHuan Hefei Manufacturing Plant — Precision Winding & Assembly Line
Factory Build Quality
Internal Construction & Premium Materials
Built with tier-1 certified raw materials engineered for long operational life (>30 years), superior dielectric withstand, and high short-circuit withstand capacity.
Silicon Steel Core
High-grade grain-oriented cold-rolled silicon steel with step-lap mitered joints for low $P_o$ losses.
100% Copper Windings
Electrolytic oxygen-free copper with high thermal grade insulation for surge resistance.
Precision Tap Changer
De-energized tap switch ($\pm 2 \times 2.5\%$) or on-load vacuum tap changer (OLTC) optional.
Protection & Sensors
Buchholz gas relay, magnetic oil gauge (MOG), and dial thermometers with alarm contacts.
Quality Assurance
CNAS & ISO 9001 Certified
100% Factory Acceptance Testing (FAT) Protocol
Every transformer unit manufactured by XinHuan undergoes mandatory routine factory testing prior to container dispatch. Full certified routine and type test submittal reports are provided with commercial documentation:
1. Insulation Resistance
Megger test (HV to LV, HV to Earth, LV to Earth) >1000 MΩ.
2. Voltage Ratio & Vector
Turns ratio check across all taps with phase displacement check.
3. Winding DC Resistance
Precision Kelvin bridge measurement across all tap positions.
4. Short-Circuit Impedance
Load loss ($P_k$) measurement corrected to reference temp (75°C).
5. No-Load Loss & Current
Core excitation test ($P_o$ and $I_o$) at rated sinusoidal voltage.
6. AC Voltage Withstand
Power-frequency separate source test (e.g. 50kV/70kV 1 min).
7. Lightning Impulse (BIL)
Full wave & chopped wave impulse withstand (BIL up to 170kV).
8. Partial Discharge & Seals
Ultra-low discharge (<5 pC) and pressurized oil/gas tightness test.
Logistics Intelligence
Global CIF / FOB Delivery
Export Packaging & Seaport Logistics
Factory direct foam carton packaging. Worldwide express courier or air freight.
Production Lead Time
Standard manufacturing cycle is 4 to 6 weeks from approval of GA blueprints and single-line diagrams.
Heavy-Duty Export Packaging
Vacuum moisture barrier preservation, nitrogen blanketing, and reinforced steel-frame structural crate skids.
Direct Seaport Routes
Fast ocean freight to Port of Chancay & Callao (25-35 days), Manila, Lagos, and Middle East ports.
Equipment Video Inspection
100% TestedWatch XinHuan technicians perform routine dielectric testing, winding insulation checks, and quality inspections inside our Hefei manufacturing plant.
Every unit 100% routine tested before container loading.
Direct Factory Consultation
Need Custom Project Engineering?
Send your single-line diagram (SLD), voltage ratings, or tender specifications. Our chief electrical engineers will review and issue an actionable CIF quotation within 24 hours.
Custom Voltage Ratios
High-Altitude Derating
Short-Circuit Impedance
Third-Party FAT Witness
Engineering & Procurement FAQs
Frequently asked questions regarding specifications, certifications, and delivery for R40-TS4390A 40VA Tube Preamplifier R-Core Power Transformer.
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.
Standard manufacturing lead time is 4 to 6 weeks following approval of GA blueprints and single-line diagrams. Direct sea container shipping is available under FOB, CFR, or CIF terms with full customs documentation (Bill of Lading, Certificate of Origin, Test Reports).