Lundahl LL1931 Amorphous Core Moving Coil Input Transformer

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.

Frequency response
10-100000
Diameter
1.5
Transformer Type
Moving Coil Input Transformer

€274.95

4 in stock

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SKU: LL1931 Categories: , ,
Description

Highlights of the Lundahl LL1931

  • Moving coil step-up transformer with uncut amorphous cobalt core
  • Dual-coil structure improves immunity to external magnetic fields
  • Wound with Cardas high purity copper wire in an oversized design
  • Mu-metal can housing for additional magnetic shielding
  • Configurable for 1:8 serial-serial or 1:16 parallel-serial connection
  • 10 Hz to 100 kHz frequency response at ±1.0 dB in serial connection

 

Product details Lundahl LL1931

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.

Specifications

Article numberLL1931
EAN9504349656221
Transformer TypeMoving coil input transformer
Core MaterialAmorphous cobalt
Core TypeUncut amorphous cobalt core
Turns Ratio1 + 1 : 8 + 8
Tolerance+/- 1.0
Frequency Response10-100000
Dimensions (L x B x H)43 x 28 x 22
Diameter1.5
Height22
Article numberLL1931
EAN9504349656221
Additional information
Transformer TypeMoving Coil Input Transformer
Core MaterialAmorphous cobalt
Core TypeUncut amorphous cobalt core
Turns Ratio1 + 1 : 8 + 8
Tolerance+/- 1.0
Frequency response10-100000
Dimensions (L x B x H)43 x 28 x 22
Diameter1.5
Height22
Shipping & Delivery
USPS Fast Shipping