LL1941 Lundahl MC-Übertrager amorph, low Imp. low-Output-MC

Lundahl LL1941 high-ratio transformer for low-output MC cartridges

The Lundahl LL1941 is a premium high-ratio step-up transformer for particularly quiet and low-impedance moving-coil cartridges. Its 1:16 and 1:32 ratios provide approximately 24 or 30 dB of passive voltage gain.

An amorphous cobalt core, Cardas OFC windings, dual-coil construction and a mu-metal enclosure make it especially attractive for Ortofon SPU, Cadenza and Quintet models, Dynavector, Phasemation and other low-output cartridges.

Suitable applications

• Ortofon SPU Classic G and GE MkII at 1:32
• Ortofon Cadenza and Quintet at 1:16
• Dynavector 20X2A-L, XX-2A and Phasemation PP cartridges
• Very low-output MC cartridges feeding an MM phono stage

Technical specifications

Transformer type

Premium low-output MC step-up transformer, one channel per component

Core material

Uncut amorphous cobalt strip core

Winding wire

Cardas high-purity OFC copper

Winding construction

Symmetrical dual-coil structure in a mu-metal enclosure

Step-up ratios

1:16 or 1:32

Voltage gain

Approximately 24.1 dB at 1:16 or 30.1 dB at 1:32

Cartridge load with a 47 kΩ MM input

Approximately 184 Ω at 1:16 or 46 Ω at 1:32 without additional loading

Data-sheet frequency response

Approximately 10 Hz to 100 kHz within ±1 dB using a 10 Ω source and open secondaries

Dimensions

Approximately 43 × 29 × 22 mm

Weight

Approximately 90 g

Stereo requirement

Two LL1941 transformers are required for stereo

Choosing 1:16 or 1:32

A 1:16 ratio is often the more balanced starting point for cartridges producing approximately 0.25 to 0.4 mV. The 1:32 ratio is particularly useful around 0.1 to 0.2 mV, provided that the cartridge accepts the lower reflected load and the MM stage can accommodate approximately 30 dB of passive gain.

A high turns ratio is not automatically correct for every low-impedance cartridge. A design combining unusually high output with a high recommended load may require a lower ratio despite having a very low internal impedance.

Questions about choosing a low-output MC transformer

Which transformer suits an Ortofon SPU Classic G or GE MkII?

The Lundahl LL1941 at 1:32 is a particularly suitable starting point. A 0.2 mV cartridge output becomes approximately 6.4 mV, while a 47 kΩ MM input reflects about 46 Ω to the 2 Ω cartridge. A 1:16 connection producing approximately 3.2 mV may be better for a sensitive MM stage.

Which step-up transformer suits an Ortofon Cadenza, Quintet or Dynavector XX-2A?

The LL1941 can initially be connected at 1:16. A Cadenza Bronze then produces approximately 6.4 mV, a Quintet about 4.8 mV and a Dynavector XX-2A approximately 4.5 mV. The reflected load from a 47 kΩ input is about 184 Ω.

Can I select either 1:16 or 1:32 with the LL1941?

Yes, both ratios are available through different external winding connections. A ratio selector may be added when signal paths remain very short, high-quality contacts are used and the wiring follows the Lundahl data sheet exactly.

Is the LL1941 suitable for a Phasemation PP-1000, PP-2000 or PP-5000?

Yes, these approximately 0.3 mV, 4 Ω cartridges can be used at 1:16 and then produce about 4.6 to 4.8 mV. A 1:32 ratio produces roughly 9.3 to 9.6 mV and should only be used with sufficient MM-stage headroom and suitable cartridge loading.