Ampex 200

The Ampex 200 is historically significant as the world's first commercially produced reel-to-reel audio tape recorder, introduced in 1947. It is a tube-based, full-track mono machine capable of recording and playback at 30 inches per second (ips), with a frequency response of 30 Hz to 15,000 Hz ±1 dB and wow and flutter at just 0.03% at 30 ips. It features three heads (record, playback, and erase) made from permalloy, providing high fidelity performance with a signal-to-noise ratio of about 60 dB.

The machine had three motors: a hysteresis synchronous capstan motor for tape speed consistency, a take-up motor, and a rewind motor with a unique brake system to maintain tape tension and prevent slack. It used 1/4-inch tape on 10.5-inch reels and cost about $5,000 at launch, weighing around 240 pounds (109 kg). The Ampex 200 was designed with plug-in chassis and head assemblies for rapid maintenance and head changes.

Amplification and equalization circuits allowed 100% modulation with fine adjustments for high and low frequencies both on recording and playback. The recorder also included sophisticated controls for start, record, fast forward, rewind, and stop functions, maintaining tape tension and speed accuracy within 0.03%.

Its design set industry standards for signal quality and reliability and laid the groundwork for later recording technologies, including stereo machines. The Ampex 200 is regarded as a breakthrough in tape recording technology, enabling the first modern high-fidelity audio recordings and significantly impacting studio and broadcast recording practices post-WW2.