Ultra low-noise MC preamplifier

This preamplifier was designed for low-impedance signal sources like MC (moving-coil) pick-up cartridges used in highend record players (yes, they still exist). The actual input impedance of the preamplifier is 100 Ω. To keep the input noise as low as possible, three dual transistors type SSM2220 or MAT03 transistors are connected in parallel to form a discrete difference amplifier.