Marantz SD 151 – cassette recorder

In 1985, the cassette recorder was still a central component of home hi-fi systems and marked a period of full maturity for the cassette tape: manufacturers were refining the mechanics, cartridges and circuitry with the aim of achieving a cleaner background, better frequency response and smoother tape movement. It is against this historical backdrop that this compact 2-head deck was developed, a configuration typical of the era for its reliability and rational design, featuring a combined recording/playback head and a dedicated erasure head, paired with a DC motor and a mechanism designed for smooth tape transport.

From a technical standpoint, the unit employed a 4-track / 2-channel stereo system and operated at the standard speed of 4.75 cm/s, supporting the main types of tape in use at the time: Type I, CrO₂ and Metal. The inclusion of Dolby B noise reduction was a hallmark of that era, as it helped to minimise perceived hiss and make playback ‘quieter’ during less dynamic passages. The stated frequency response reached up to 17 kHz with Metal tape (30 Hz – 17 kHz), whilst the signal-to-noise ratio reached 65 dB with Dolby B; figures which, viewed from the perspective of the time, clearly illustrate the ambition to bring the cassette tape to increasingly credible performance levels within hi-fi systems. The wow and flutter figure of 0.08% also fitted within the same design philosophy, aimed at limiting the micro-instabilities in tracking typical of magnetic media.

A collector’s item, refurbished and in excellent cosmetic condition.