LL1678 & LL1678XL Lundahl Moving Coil SUT
LL1678 & LL1678XL Lundahl Moving Coil SUT
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LL1678 & LL1678XL Lundahl Moving Coil SUTLL1678 & LL1678XL Lundahl Moving Coil SUT

LL1678 & LL1678XL Lundahl Moving Coil SUT

Lundahl
Core Size: Standard
PCB: Standard
Price:
£78.00 £93.60 Inc. VAT

  • The Lundahl LL1678 is a high-performance moving coil step-up transformer designed for premium MC SUT and moving coil preamp applications. Configurable for turns ratios of 1:8, 1:16 and 1:32, the LL1678 is an excellent choice for low-output moving coil cartridges requiring low noise, natural dynamics, and precise cartridge loading.

     

    Based on Lundahl’s classic LL9206 design, the LL1678 features reduced copper resistance, improved level capability, and enhanced frequency response while maintaining excellent low-frequency bandwidth. Its dual-coil structure surrounds each secondary winding with two primary windings, resulting in excellent immunity to surrounding magnetic fields and highly flexible connection options.

     

    The transformer is fully compatible with the MC1 DIY Kit, allowing you to build your own high-quality moving coil step-up transformer preamp using the same Lundahl technology found in high-end commercial MC SUT designs. Please note if using these transformers with the MC1 kit, only 1:16 and 1:32 ratios will be available.

     

    The LL1678 uses Lundahl’s cobalt-based uncut amorphous strip core and is housed in a mu-metal enclosure for excellent shielding and low noise performance. For those seeking even greater headroom and lower distortion, the LL1678XL version increases the core cross section by approximately 40%, improving low-frequency performance, signal handling, and overall ease of presentation.

     

    Available with either standard or XL core sizes depending on your system requirements and cartridge choice.

     

    Every LL1678 pair includes a free HASL mounting PCB suitable for DIY moving coil SUT projects. For premium builds, you can upgrade to an ENIG gold-plated PCB for an additional £10.

     

    Most Lundahl transformers are wound to order and typically require a 4–8 week lead time. We do however stock selected popular models, in which case your order will ship immediately.

     

    If you need help selecting the correct ratio, cartridge loading, or designing your own moving coil step-up transformer preamp, please get in touch.

     

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MC1 DIY Kit – Lundahl Moving Coil Step-Up Transformer Preamp
MC1 DIY Kit – Lundahl Moving Coil Step-Up Transformer Preamp
MC1 DIY Kit – Lundahl Moving Coil Step-Up Transformer Preamp
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MC1 DIY Kit – Lundahl Moving Coil Step-Up Transformer PreampMC1 DIY Kit – Lundahl Moving Coil Step-Up Transformer PreampMC1 DIY Kit – Lundahl Moving Coil Step-Up Transformer Preamp

MC1 DIY Kit – Lundahl Moving Coil Step-Up Transformer Preamp

Orso Audio

*Shipping June 2026*

 

The MC1 DIY kit is a complete parts pack to build your own step-up transformer preamp for moving coil (MC) cartridges. Used between your turntable and a standard MM phono input, a properly designed SUT increases signal voltage passively while preserving the low-noise, dynamic character that makes transformer coupling so compelling.

 

This kit follows the same design intent as our assembled MC1 units - robust mechanical grounding, reliable switching, and a layout that’s built for consistent real-world results.

What's included

  • Aluminium enclosure with black front panel
  • Gold-plated PCB
  • Gold-plated RCA connectors
  • High-quality switches
  • Grounding lug / hardware
  • Resistors and capacitors required for the circuit
  • Mounting hardware and essential build items required to complete assembly
  • Transformers, if purchased together

 

This kit is compatible with all Lundahl moving coil step-up transformers. 

Skill level

This is a straightforward DIY build, but it is not a “first soldering project.” We recommend prior soldering experience, as the parts are high quality and can be damaged by excess heat or poor technique.

Tools you'll need

  • Soldering iron (temperature controlled recommended)
  • Good quality solder
  • Small hand tools (flush cutters, pliers, screwdriver)

Note on responsibility

This is a DIY kit. Assembly, testing, and safe operation are the builder’s responsibility. If you are not confident with soldering and basic electronics handling, consider an assembled unit instead.

Transformers: None
Price:
£124.00 £148.80 Inc. VAT
MC Load Calculator

MC1 Load Calculator

Optimise your moving coil cartridge loading

Results

Required Resistor (Theoretical):
N/A
MC1 Resistor:
N/A
MC1 Input Z:
N/A
Voltage Gain:
N/A
Output Voltage:
N/A

Instructions

  • Select your transformer model and step-up ratio
  • Enter your phono input impedance (default is 47kΩ)
  • Enter the desired load impedance for your cartridge
  • Optionally enter cartridge specs for gain predictions
  • Click Calculate for loading recommendations

Notes:

When the desired load is below 40 Ω, you’ll see an advisory suggesting a primary-side load. Calculations still run normally.

"No resistor required" - Phono input already provides suitable load

Moving Coil Step Up Transformers explained

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