Lundahl LL1623-PP Output Transformer for Tube Amplifiers Push-Pull

Highlights of the Lundahl LL1623-PP

• Push-pull output transformer for tube amplifier designs
• Highly sectioned windings with harmonically sized sections for low leakage inductance
• Low-capacitance coil winding technique for a wide frequency range
• Special Lundahl audio C-core with 25 µm air gap for push-pull operation
• Open-frame construction for mounting inside an amplifier housing
• 2.5 kg transformer with 5.08 mm pin spacing and 4 x M4 mounting holes

Product details Lundahl LL1623-PP

Lundahl LL1623-PP Tube Amplifier Output Transformer Push-Pull

The Lundahl LL1623-PP is built for push-pull tube amplifiers and uses the LL1623 transformer platform with a 25 µm core air gap. Its primary load impedance options include 5.6 kΩ, 3.0 kΩ, and 1.6 kΩ depending on the secondary connection alternative, making it suitable for a range of tube output stage configurations.

Its winding structure is highly sectioned with harmonically sized sections, reducing leakage inductance to a minimum. Combined with a low-capacitance winding technique and Lundahl’s special audio C-core, this design supports wide-band audio performance in demanding audio components.

For the LL1623, the turns ratio is 4 x 13.4 : 8 x 1. The primary static resistance with all primary windings in series is 164 Ω, the average static resistance of each secondary is 0.4 Ω, and the primary leakage inductance with all primary windings in series is 4.6 mH. The maximum primary signal voltage for push-pull operation is 610 V RMS at 30 Hz, and the transformer provides isolation of 3 kV between primary and secondary windings and 1.5 kV between windings and core.

The open-frame format is intended for installation inside an amplifier housing. With a weight of 2.5 kg, 5.08 mm pin spacing, and 4 x M4 mounting holes, the LL1623-PP is a substantial choice among tube amplifier amplifier accessories where robust construction and flexible secondary connection options for 4, 8, and 16 Ω loads are required.