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The Lundahl LL1931 is a high performance moving coil step-up transformer built around an uncut amorphous cobalt core, dual-coil construction and Cardas high purity copper wire for demanding MC phono applications.
Lundahl LL1931 Amorphous Core Moving Coil Input Transformer
The Lundahl LL1931 is designed as a cost-no-object moving coil input transformer for high quality phono step-up stages. As a precision audio component, it combines an uncut amorphous cobalt core with an oversized transformer design to support wide bandwidth and low-level signal integrity.
Its dual-coil structure is made to improve immunity against external magnetic fields from nearby power supplies, motors and similar interference sources. The transformer is housed in a mu-metal can, making it suitable for sensitive home audio applications where low noise performance is essential.
The LL1931 has a turns ratio of 1 + 1 : 8 + 8 and offers multiple connection options. It can be wired in a serial-serial 1:8 configuration or in a parallel-serial 1:16 configuration, giving designers flexibility when matching moving coil cartridges to a phono preamplifier input.
Key electrical and mechanical specifications include 1.8 Ω static resistance per primary, 105 Ω static resistance per secondary, and isolation of 3 kV between windings and 1.5 kV between windings and core. The transformer measures 43 x 28 x 22 mm above the PCB, uses 5.08 mm pin spacing with 30.5 mm row spacing, has a recommended PCB hole diameter of 1.5 mm and weighs 80 g.
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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
