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Jensen Transformers MC-2RR Moving Coil SUT

ISO-MAX Phono Cartridge Step-Up Transformer

Made in the USA
Jensen Transformers MC-2RR ISO-MAX Moving Coil Step-Up Transformer

Jensen Transformers MC-2RR ISO-MAX Moving Coil Step-Up Transformer

The Jensen Transformers MC-2RR ISO-MAX Moving Coil Phono Cartridge Step-Up Transformer provides audiophile-quality level matching and isolation suitable for the finest analog audio playback systems.

Commonly known as an "SUT" (Step Up Transformer), the MC-2RR is a transformer-based,  passive, stand-alone step-up device for use between a moving-coil phonograph needle cartridge and a conventional hi-hi phono preamp.

Two versions are available to satisfy a wide range of applications. 

MC-2RR-L is the "low ratio" 1:10 step-up model, containing two JT-44K-DX step-up transformers.  With this model, the audio signal coming from the m/c cartridge is increased by about 20dB.

The MC-2RR-H is the "high ratio" 1:37 step-up model, containing two JT-34K-DX step-up transformers. This model  increases the audio signal coming from the m/c cartridge by about 31dB.

For most moving coil cartridges, we recommend the "L" version. The "H" version is only recommended for very low impedance, low output cartridges that also require a resistive load of less than 100 Ohms.  We have included a Selection Table (at the upper right), but if you have any doubts as to which model is most appropriate for your particular setup, please do not hesitate to contact us - we will be happy to make recommendations for your specific equipment mix.

Case dimensions for both models are 140mm L  x 77mm W x 50mm H  (~5.51" x 3.03" x 1.97") not including the small rubber feet.

With inferior products coming from all over the world, we think it is a genuine treasure to find a company like Jensen Transformers, actually designing and manufacturing some of the finest products in the world, right here in the USA, and we are proud to be able to offer their products. The MC-2RR is made in the USA, is backed by the manufacturer's comprehensive one-year warranty, and has a remarkable 20-year warranty on the transformer device itself.

Don't Forget the Cables!

Good cables are very important in the fight against hum and noise. You will need at least one pair of short patch cables in order to insert the MC-2RR into your signal path, and you may want to consider upgrading your existing cable(s) as well. The MC-2RR does not include any cables, but if you need them, we have some very high-performance unbalanced interconnect cables available. Please click here to see them!

Jensen Transformers' Description

Jensen Transformers MC-2RR

Moving Coil Step-up Transformer Products

Our Moving Coil Cartridge Transformers are now available in a Ready to Use Package


  • Proper damping (Zobel) network built in
  • Heavy duty gold plated RCA connectors
  • Ground lugs on both ends for turntable and package grounding


  • Contains two JT-44K-DX 1:10 Step-up Transformers
  • Provides 20dB of gain for medium to high output cartridges
  • Ideal for cartridges such as the Denon DL-103


  • Contains two JT-34K-DX 1:37 Step-up Transformers
  • Provides 31dB of gain for low output cartridges
  • Ideal for many of the Ortofon cartridges
Jensen Transformers MC-2RR Inputs

The input connectors can be seen on this end of ISO-MAX SUT.

Jensen Transformers MC-2RR Outputs

Here is the output end of the MC-2RR.  Notice that the more popular "-L" model is shown here, but we also have the "-H" version available (below) by special order.

Jensen Transformers MC-2RR included items

The MC-2RR comes in the foam-lined box shown here, and we double-box it for safe shipment.  We also include a printed copy of the transformer datasheet.

Jensen Transformers MC-2RR Selection Table - click to download PDF

This Selection Table may help you decide between the "-L" and "-H" version of the MC-2RR SUT.  PDF format.

Jensen Transformers JT-44K-DX Datasheet - click to download PDF

Here is the datasheet for the JT-44K-DX step-up transformers used in the
MC-2RR-L model.  Click to download PDF.

Jensen Transformers JT-34K-DX Datasheet - click to download PDF

Datasheet for the JT-34K-DX step-up transformers used in the MC-2RR-H model.  Click to download PDF.

Configurations and Pricing
Product Description SKU MSRP Your Price Quantity
Jensen Transformers ISO-MAX Moving Coil Step-Up Transformer
"-L" Version - 1:10 Ratio (+20dB)
(Stocking item)
MC-2RR-L $714.99 $649.99
Jensen Transformers ISO-MAX Moving Coil Step-Up Transformer
"-H" Version - 1:37 Ratio (+31dB)
(Special Order item)
MC-2RR-H $714.99 $649.99
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