All transformers require excitation current before they will pass any signal. Where do you think the S.U.T. gets its excitation current from? Has it a power supply? No. So obviously it uses some of the signal as excitation current. That would be OK but for the fact that magnetic cartridges don't have a linear
Bass frequencies are the lowest audio frequencies, below which everything becomes DC or direct current. DC doesn't commutate from positive to negative – it doesn't 'cycle' – so it cannot be transformed. Low bass frequencies to a transformer move so slow that they're 'almost DC', As a result transformers distort most of all at
For a start, the Elevator EXP doesn't hum. Transformers do. To be correct, the transformer itself doesn't hum, but the magnetic surrounding fields easily get induced into it. These magnetic fields are predominantly mains-borne. There are a number of hum sources including all your mains powered equipment, surrounding mains powered products, and even the
Low output moving coil (MC) with output in the region of 0.15 - 0.8 mV (ref 1kHz at 5cm/sec) The Elevator EXP must always be used between cartridge and a moving magnet sensitivity input. It must never be used 'post EQ' - after the moving magnet phono preamp.
Item Measurement Input range 0.15mV to 0.8mV Output (for input range) 2mV to 10mV, suitable for a moving magnet phono stage input Maximum input 378mV rms (a very large overload margin) Maximum output 4.914V rms Gain 22dB (13) < 10Hz to 917kHz (-3dB points) Input impedance 23, 30, 100, 840, 1000, 5100 and 47000