PR5 Moving Coil step up transformer (pair)

Moving coil cartridges exhibit very low output voltages, usually around 10% of a MM cartridge. Without a step up transformer the resulting signal does not present a satisfactory input for the phono preamp stage.

LL9226 is an MC transformer based on (and pin compatible with) Lundhal's classic LL9206, but with reduced copper resistance and level capability. The new design has resulted in an even better frequency response but still with enough no load impedance to maintain the LF bandwidth. The transformer is built up from two coils, each coil with one secondary winding surrounded by two primary windings. Advantages with this structure are excellent frequency response and high immunity to surrounding magnetic fields. All winding ends are available on the pins. Thus, the transformer can be used with a set of different turns ratios.

The Red Roo phono preamplifier is designed with interfaces to easily accept the LL9226 for moving coil cartridge support. Installation of two LL9226 transformers converts one of the two MM interfaces to MC.