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The Lundahl LL1680-5 is a line output transformer for tube amplifiers, designed for high-impedance tube stages and configurable for balanced or unbalanced 600 ohm and 150 ohm outputs.
Lundahl LL1680-5 Line Output Transformer for Tube Amplifiers 5mA
The Lundahl LL1680-5 is made for line output use in tube amplifiers and is designed to match or exceed the specifications of the UTC LS-27 transformer. Its 9 + 9 : 1 + 1 + 1 + 1 winding structure allows multiple connection alternatives, giving builders practical flexibility for different output requirements.
For balanced 15k:600 ohm operation, the transformer uses an 18:4 turns ratio and delivers a 15 Hz to 50 kHz frequency response at 15 kΩ source impedance and 600 Ω load. For unbalanced 15k:600 ohm operation, response is 15 Hz to 40 kHz. When configured for 15k:150 ohm operation, the balanced connection reaches 15 Hz to 55 kHz, while the unbalanced connection is specified at 15 Hz to 40 kHz.
The LL1680-5 uses paper insulation in the high-impedance sections instead of polypropylene foil to help reduce internal capacitance. Each coil consists of three sections to optimize leakage inductance against inter-winding capacitance, while the special audio C-core supports the transformer’s use in demanding audio components.
Key electrical ratings include 210 H primary inductance, 150 V RMS maximum primary signal voltage at 30 Hz, and isolation of 4 kV between primary and secondary windings and 2 kV between windings and core. The unit weighs 0.35 kg and is built with 4 x M3 mounting holes for secure installation.
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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
