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The Lundahl LL1620-PP is a push-pull tube amplifier output transformer with a highly sectioned winding structure, low leakage inductance and a wide frequency range. It is built on Lundahl’s special audio C-core and designed for open-frame mounting inside an amplifier housing.
Lundahl LL1620-PP Output Transformer for Tube Amplifier Push-Pull
The Lundahl LL1620-PP is part of Lundahl’s tube amplifier output transformer range and is intended for push-pull output stages. It uses the same core size, winding structure and secondary arrangement as related models in the series, with a primary winding configuration tailored to the LL1620 impedance level. For builders working with high-quality audio components, it provides a robust transformer platform for demanding valve amplifier designs.
The transformer is highly sectioned with harmonically sized sections, helping to keep leakage inductance low. Combined with a low-capacitance coil winding technique, this construction supports a wide frequency range. The LL1620-PP features a special Lundahl audio C-core and, as a push-pull version, uses a 25 µm core air gap to allow for a small DC unbalance in the output circuit.
For push-pull use, the LL1620 offers primary load impedance options of 11.5 kΩ, 6.0 kΩ and 3.3 kΩ depending on the selected secondary connection and loudspeaker load. It has a turns ratio of 4 x 19.2 : 8 x 1, a primary static resistance of 308 Ω with all primary windings in series, an average secondary resistance of 0.4 Ω per secondary, and 11 mH primary leakage inductance with the primary connected in series.
With all primary windings in series, the maximum primary signal voltage for push-pull operation is 860 V RMS at 30 Hz. The transformer provides 3 kV isolation between primary and secondary windings and 1.5 kV isolation between windings and core. Its open-frame construction is suitable for mounting inside amplifiers, with 4 x M4 mounting holes, 5.08 mm pin spacing, physical dimensions of 118 x 90 x 85 mm, and a weight of 2.5 kg.
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Speakers
Amplifiers
DAC converters
DSP modules
Turntables
Streamers
Woofers
Tweeters
Exciters
Bass shakers
Plate amplifiers
Amplifier modules
Single board computers
Assembled crossovers
Printed Circuit Boards (PCB)
Capacitors
Resistors
Coils
Circuit Breakers
Crossover tools
Screw terminals
Acoustic measurements
Electric measurements
Sound level meters
DIY amplifier kits
DIY component packs
DIY speaker kit
DIY subwoofer kits
DIY bluetooth speaker
DIY electronics kits
Binding posts
Cabinet Hardware
Cables
Connectors
Speaker cabinets
Electromechanics
Power supplies
Speaker repair
Workshop & tools
Amplifier accessories
Stands & mounts
Gift voucher
Books
New products
