Oliver - A head amp is used to raise the low output signal from a moving coil cartridge so that it can then be fed into a standard moving magnet phono preamp.
It's prime requirement is to be low noise as the input can be in the order of 0.2mV, that's 200 millionths of a volt :eek:
It's an alternative to a SUT (Step Up Transformer).
Andrew - I will be sending out two demonstrators so we can certainly arrange that.