Rothwell Anniversary Custom Moving Coil Step-Up Transformer

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Stock code: RWELLANNCSTM


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    Product Information

    The Anniversary Custom is revolutionary in the world of audiophile mc step-up transformers being the only transformer in the world to feature dual cores (per channel) for hum-cancelling, giving at least a 20dB reduction in the pickup of external magnetic fields. It also features a very low-loss core material, multi-layer winding and adjustable loading for both the primary side of the transformer and the secondary side. The bandwidth is wide and flat with excellent transient performance. These features make this the ultimate step-up transformer for today’s state-of-the-art low output moving coil cartridges.

    Hum-cancelling design
    The Anniversary Custom employs two transformer cores per channel rather than the usual one, enabling the cancellation of any hum picked up from stray external magnetic fields. This unique feature, found on no other step-up transformer in the world today, allows the user to enjoy music with an exception signal-to-noise ratio.

    Hand-wound coils
    Rothwell carefully hand wind each transformer in-house using multi-layer winding techniques to minimise inter-winding capacitance and maximise the high frequency extension for beautifully clean transients.

    Primary Load Adjustment
    This facility lets the user select different loading resistors on the primary side of the transformer which act on the cartridge directly to alter the load impedance it sees. Six settings are available to fine tune the performance.

    Secondary Load Adjustment
    This facility lets the user select different loading resistors on the secondary side of the transformer which not only alter the load impedance set by the cartridge but also have a subtle effect on the performance of the transformer itself and can extend the low frequency response of the cartridge/transformer combination and damp the high frequency response. Six settings are available and used in conjunction with the primary load adjustment there are 36 possible combinations available to fine tune the performance of the cartridge.

    Cartridge Compatibility
    The Anniversary Custom is optimised for cartridges with output voltages in the range 0.3mV to 0.5mV and with coil impedances in the range 4 ohms to 6 ohms. This makes it ideal for use with many cartridges from Ortofon, Lyra, Koetsu etc. It is also compatible with cartridges with any coil impedance of 12 ohms or below.

    Technical Specifications

    Turns Ratio 1:10
    Voltage Gain 20dB (x10)
    Core Material Dual Ferrite
    Input Impedance (aka Cartridge Load Impedance)* User Adjustable
    Optimum Transformer Load Impedance** 47k + 150pF
    Bandwidth 18Hz - 65kHz (+0/-3dB, 6 ohm source)
    Cartridge Compatibility (o/p) 0.25mV - 0.9mV
    Cartridge Compatibility (imp.) Internal Impedance <12Ω
    Dimensions 135mm x 200mm x 50mm
    Weight 1kg

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