The Lundahl LL3723-PP is a push-pull tube amplifier output transformer with UL taps, designed for 4.3 kΩ primary impedance and 4 or 8 Ω secondary loads.
Highlights of the Lundahl LL3723-PP
- Push-pull tube amplifier output transformer with UL taps
- 4.3 kΩ primary impedance with 4 Ω and 8 Ω secondary connections
- 37% UL tap from B+ for ultra-linear operation
- High-quality grain-oriented silicon steel C-core construction
- Frequency response of ±1 dB from 5 Hz to 60 kHz
- Maximum output power of 160 W at 30 Hz
Product details Lundahl LL3723-PP
Lundahl LL3723-PP Output Transformer for Push-Pull Tube Amplifiers 4.3 kΩ to 4/8 Ω
The Lundahl LL3723-PP is built for push-pull tube amplifiers and provides a 4.3 kΩ primary with secondary taps for both 4 Ω and 8 Ω loudspeaker loads. Its 37% ultra-linear tap from B+ supports UL operation, making it a precise output stage component for demanding tube amplifier designs.
Internally, the transformer uses two coils, each made up of three sections: one primary section and two secondary sections. The winding arrangement is designed to minimize destructive capacitive coupling between primary and secondary windings while maintaining extremely small phase error between the anode and UL tap.
The LL3723-PP uses a high-quality grain-oriented silicon steel C-core, supporting strong low-frequency capability and wide bandwidth. With a primary inductance of approximately 1000 H, 18 mH primary leakage inductance, and a frequency response of ±1 dB from 5 Hz to 60 kHz, it is a serious choice among high-performance audio components for tube amplifier construction.
For practical integration, the LL3723-PP supports up to 150 mA recommended primary DC current through the windings, with a maximum of 300 mA DC from B+. It handles up to 850 V RMS primary signal voltage at 30 Hz, offers 160 W maximum output power at 30 Hz, and weighs 2.5 kg. This makes it a robust option within amplifier accessories for serious push-pull tube amplifier projects.
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