Audio Frequency Transformer ATU

Key Features

Engineered for vacuum tube microphone systems, the Audio Frequency Transformer ATU Series delivers studio-grade signal conversion with turns ratios up to 1:28. As a precision Low Frequency Transformer, it achieves ultra-low distortion (0.003% THD+N) and exceptional CMRR (114dB @60Hz). Shielded copper construction minimizes EMI, while encapsulated windings ensure RoHS/UL94V-0 compliance. Optimized for synergy with RF inductors in high-fidelity circuits.

Technical Specifications

• Turns Ratio: 1:4.55 to 6.5:1 (model-dependent)

• Frequency Response: ±0.02dB (20Hz–20kHz)

• Inductance: 3.25H @100Hz (Bm-Yel) / 42mH @1kHz (Bm-Yel)

• DC Resistance: 172mΩ (Blue-Red) to 1.72kΩ (Red-Bm)

• Voltage Gain: -16dBu to -19dBu @1kHz (600Ω load)

• Capacitance: ≤88pF @1kHz

• THD+N: 0.003% @24dBu

• Operating Temp: 0°C to +70°C

Applications

1. Professional Audio: Tube microphone output stages, preamp isolation.

2. Test & Measurement: Precision Sensor-based instruments requiring >114dB CMRR.

3. Broadcast Equipment: Studio consoles with EMC filters for noise suppression.

4. Power Management: Stable voltage conversion in power converters for analog circuits.

5. Telecom Interfaces: Paired with Transformers for impedance matching.

FAQ

Q: How does it differ from power inductors?
A: Tailored for 20Hz-100kHz audio bands (not power transfer), with lower DCR than standard power inductors.

Q: Can it reduce RF interference in mic circuits?
A: Yes, combine with RF inductors and EMC filters for optimal noise rejection.

Q: Custom turns ratios supported?
A: Available for specialized transformers (e.g., 1:28 for high-impedance mics).

Cross-Industry Integration

• Low Frequency Transformers for sub-100kHz audio conditioning

• Sensors in measurement systems leveraging 0.003% THD

• Power converters utilizing multi-tap windings for voltage adaptation