A magnetic resonance assembly comprising - a magnetic resonance coil array (26, 28) including one or more coil channels, each comprising a coil element circuit and a corresponding coil element configured to detect radiofrequency signals, - a coaxial transmission line (46, 48), - an external system or device, and a driver circuit configured to provide a power signal, wherein the coil element circuit includes at least one active component including a preamplifier configured to be powered by the power signal carried on the coaxial transmission line (46, 48), wherein the MR coil array (26, 28) is connected to the external system or device using the coaxial transmission line (46, 48), wherein the MR assembly is configured such that the detected RF signals are provided to the external system or device on the coaxial transmission line (46, 48) and detected RF signals provided to the external system or device are amplified by the preamplifier, the MR coil array further comprising - a tune/detune circuit connected to the coaxial transmission line and configured to tune the coil element in response to the power signal reaching a first direct current voltage and to detune the coil element in response to the power signal reaching a second DC voltage, characterized in that - the driver circuit is configured to vary the voltage of the power signal between said first and second DC voltages, wherein said first and second DC voltages are of the same polarity and - the preamplifier is gain stable over the first and second DC voltages. - a magnetic resonance coil array (26, 28) including one or more coil channels, each comprising a coil element circuit and a corresponding coil element configured to detect radiofrequency signals, - a coaxial transmission line (46, 48), - an external system or device, and a driver circuit configured to provide a power signal, wherein the coil element circuit includes at least one active component including a preamplifier configured to be powered by the power signal carried on the coaxial transmission line (46, 48), wherein the MR coil array (26, 28) is connected to the external system or device using the coaxial transmission line (46, 48), wherein the MR assembly is configured such that the detected RF signals are provided to the external system or device on the coaxial transmission line (46, 48) and detected RF signals provided to the external system or device are amplified by the preamplifier, the MR coil array further comprising a driver circuit configured to provide a power signal, wherein the coil element circuit includes at least one active component including a preamplifier configured to be powered by the power signal carried on the coaxial transmission line (46, 48), wherein the MR coil array (26, 28) is connected to the external system or device using the coaxial transmission line (46, 48), wherein the MR assembly is configured such that the detected RF signals are provided to the external system or device on the coaxial transmission line (46, 48) and detected RF signals provided to the external system or device are amplified by the preamplifier, the MR coil array further comprising - a tune/detune circuit connected to the coaxial transmission line and configured to tune the coil element in response to the power signal reaching a first direct current voltage and to detune the coil element in response to the power signal reaching a second DC voltage, characterized in that - the driver circuit is configured to vary the voltage of the power signal between said first and second DC voltages, wherein said first and second DC voltages are of the same polarity and - the preamplifier is gain stable over the first and second DC voltages.