The Technics SU-300 MC is a specialized MC (moving coil) pre-preamp designed to enhance the performance of MC cartridges. Launched around 1977, it features an ultra-low noise transistor M47LP in its first stage, allowing for a remarkable input equivalent noise level of -150dBV. The device includes a built-in muting circuit utilizing a relay to eliminate shock sounds during switch operations, operating briefly only when the switch is turned on, which helps in conserving battery life. An LED indicator is present for power status and battery life monitoring. Power is supplied by six single dry batteries, achieving over 120 hours of continuous usage while minimizing hum from external power sources. The design includes a gold-plated input power terminal that ensures durability and humidity resistance. Its compact size, lightweight construction, and minimal power consumption make it an efficient addition to audio setups. The specifications highlight a voltage gain of 28dB for MC and 0dB for MM cartridges, an input impedance of 47Ω, and an impressive signal-to-noise ratio, with performance remaining robust across the audible frequency spectrum.
