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The Lundahl LL1680 is a line output transformer for tube amplifiers, designed for 15 kΩ primary applications with 600 Ω or 150 Ω balanced and unbalanced output configurations.
Lundahl LL1680 Line Output Transformer for Tube Amplifiers 5 mA
The Lundahl LL1680 is built for tube amplifiers requiring a high-quality line output transformer with flexible secondary wiring. With its 9 + 9 primary and 1 + 1 + 1 + 1 secondary structure, it supports 15 kΩ : 600 Ω and 15 kΩ : 150 Ω operation in both balanced and unbalanced output configurations.
For optimized audio performance, the LL1680 uses paper insulation in the high-impedance sections to help reduce internal capacitance. Each coil is divided into three sections, balancing leakage inductance against inter-winding capacitance, while Lundahl’s special audio C-core construction supports stable magnetic performance.
The LL1680/5mA configuration provides 210 H primary inductance and is specified for 5 mA primary DC current at 0.9 Tesla. Depending on the selected connection alternative, frequency response reaches 15 Hz to 50 kHz for 600 Ω balanced output, 15 Hz to 40 kHz for 600 Ω unbalanced output, 15 Hz to 55 kHz for 150 Ω balanced output, and 15 Hz to 40 kHz for 150 Ω unbalanced output.
With 4 kV isolation between primary and secondary windings and 2 kV isolation between windings and core, the LL1680 is a robust choice among specialist amplifier accessories. It weighs 0.35 kg, uses 4 x M3 mounting holes, and supports a maximum primary signal voltage of 150 V RMS at 30 Hz.
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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
