Rothwell MCL moving coil step-up with Lundahl transformers is an audiophile transformer designed to raise the output moving coil pickup cartridges to the level of moving magnet cartridges, This allows high quality mc cartridges to be used with phono stages which are primarily designed for mm cartridges. Most valve phono stages for example are mm only.
The heart of MCL is composed by two very high quality Lundahl transformers. We add our own primary and secondary loading networks to get the absolute best performance from them and the bandwidth is very wide (70kHz).
To achieve the best signal/noise ratio site the transformer away from large mains transformers (as found in power amps) and use good quality screened interconnects with low capacitance, preferably no longer than 1 metre, between transformer and phono stage. Rothwell River interconnects are ideal.
Despite the proliferation of moving coil phono stages available today (both onboard and outboard), many people still believe that a good step-up transformer and a moving magnet phono stage is the best way to handle a moving coil cartridge. If you want to use a valve phono stage with a moving coil cartridge, a step-up transformer is really the only way to get an acceptable performance and signal/noise ratio. So, why are there so few moving coil step-up transformers available? Because they're difficult to design and expensive to produce. However, when done properly, the performance is unsurpassed.
The Rothwell MCL Step-Up Transformer is now available to give superb performance with low output MC cartridges (0,3mV - 0,6mV recommended output level). Bandwidth is wide and flat with particular attention paid to transient response. Dimensions (mm.): 100 x 155 x 60.
Specifications: turns ratio: 1:20 voltage gain: 26dB (x20) input impedance*: 100 ohms optimum load impedance**: 47k + 150pF core material: cobalt based uncut amorphous strip bandwidth: 8Hz - 75kHz cartridge compatibility (o/p): 0.2mV - 0.7mV cartridge compatibility (imp.): <20 ohms="" br=""> dimensions: 60 x 155 x 92 mm weight: 580g