Ampex Micro 52 (1969–1971)
A $149.95 upright cassette deck that Ampex pitched at the hi-fi crowd - and that a period reviewer quietly admitted could hold its own at 1½ ips.
Overview
The Micro 52 is a stereo cassette record/playback deck. Ampex sold it for $149.95 with two dynamic microphones thrown in. That price put a walnut-finished, chrome-trimmed cabinet on the shelf next to reel-to-reel hardware rather than in the portable-recorder aisle. The case measures roughly 16½ by 10½ by 5½ inches and weighs about 10 pounds, so it's a sit-down component, not a shoulder-strap field machine. Ampex's own advertising in late 1969 argued that "some people think cassette decks have no place in a sophisticated stereo system - until now, perhaps it was true," billing the Micro 52 as the first cassette deck worth integrating into a real system. That's marketing copy, and the actual case for the machine rests on what the period press measured.
The front panel shows Ampex was thinking about living rooms. Seven piano-key transport controls run along a satin chrome strip - PAUSE, STOP, FAST FWD, PLAY/BEC, BEWIND, an interlocking BECORD key, and EJECT. The black section below splits into two hinged halves. The left cover swings forward to load a cassette. The right one hides the VU meters behind dark plastic until the power comes on, and then they glow through cutouts.
The headline numbers are honest for a cassette deck of the period. Ampex rated frequency response at ±3 dB from 50 to 10,000 Hz, signal-to-noise at 45 dB, and flutter at 0.25%. Audio (April 1970, p.62) put the Micro 52 through its equipment-profile paces and came away impressed with the flatness. Even running at 1½ ips, the deck held essentially flat response to at least 10 kHz across a range of tapes, which the reviewer called excellent for the speed. That same profile noted speed accuracy of ±1.5% and a fast-wind time of 65 seconds for a C-60.
Input and output flexibility is where the Micro 52 earns its "component" billing. Mic input sensitivity is 0.1 mV at 500 ohms, line input runs 0.07 V ±3 dB up to 1.0 V max, and line output delivers 0.6 to 1.5 V into a 50,000-ohm load. Channel separation is quoted at 55 dB side-to-side and 30 dB left-to-right. High Fidelity (January 1971, p.46) singled out the built-in mixing facility, which lets you blend mic and line sources live, as the feature that made the deck useful in a component system rather than a standalone toy. That mixing is the practical reason the two supplied microphones are there.
Measured performance tracked the specs closely. The Audio profile found signal-to-noise ranging from 43 dB on the weakest tape sample to 45.5 dB on TDK stock. Flutter-plus-wow measured 0.25% from 0.5 to 6 Hz, rising to a maximum of about 0.35% above 6 Hz. Those are numbers from real tape, not lab-optimized figures, and they suggest a transport that was well-sorted for its class. The reviewer's summary was that the basic response was flat to at least 10,000 Hz, which is a decent showing next to what 7½ ips reel machines were doing only a few years earlier.
The pitch the reviewer made to buyers was archival: transfer material you want to keep off your quarter-inch reels onto cassettes, break out the safety tab, and store them without fear of accidental erasure. That's a modest ambition compared to what cassettes would eventually become, but it's an honest one, and the Micro 52 was built to serve it. The walnut-finished wood cabinet, the satin chrome, the meters that appear when powered — it's a deck that wanted to look like it belonged next to a receiver, and by most period accounts it did.
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