Regency TR-1

A radio that fitted in a shirt pocket

The Regency TR-1 went on sale in New York and Los Angeles on 1 November 1954, announced two weeks earlier. It was advertised at 3 by 5 by 1.25 inches and 12 ounces with its battery in, a fraction of the size and weight of the portable radios it replaced, which carried vacuum tubes, ran for a few hours on heavy batteries and were usually described as portable in the way a picnic hamper is portable.

It came in black, bone white, mandarin red and cloud gray to begin with, with olive green, mahogany and a handful of rare colours following, and it sold with a cardboard box and an optional earphone at $7.50. About 150,000 were sold in total, a number driven by the novelty of the size as much as by what the radio could actually receive.

Nobody wanted to build it

Bell Labs had demonstrated the first working transistor in 1947, but seven years later the device had barely reached consumers outside of hearing aids. The reason was arithmetic: a transistor cost about $20 while the vacuum tube it would replace cost about $1. Radio manufacturers looked at that and declined.

In May 1954 Texas Instruments, then a maker of oilfield instruments and Navy locating gear, went looking for an established radio company to build a set around its transistors. RCA, Philco and Emerson all passed. Ed Tudor, president of Industrial Development Engineering Associates, took the job instead. His company had been building home antenna boosters, and he forecast 20 million transistor radios inside three years. With many Americans of the period building bomb shelters, he also expected a market for a pocket radio that worked when the power did not.

Texas Instruments was never really trying to sell radios. It wanted volume for its transistors, so that the price of a single unit would fall from the $10 to $15 range it was then stuck at. The TR-1 was a marketing instrument aimed at component economics.

The arithmetic of four transistors

The first prototype assembled at Texas Instruments used eight transistors. Six were used by the time the company sat down with I.D.E.A. The shipping TR-1 used four.

That decision was about price, not performance. Stripping out the two most expensive parts let Regency hit $49.95, a serious sum for a novelty the size of a paperback, roughly $510 in 2021 money. It also cut the audio output severely, so the TR-1 was quieter than the tube sets it was replacing. What it gave back was battery life. A 22.5 volt battery drawing 4 milliamps ran the set for 20 to 30 hours, against several hours for a portable tube radio.

The circuit was a superheterodyne with four NPN germanium transistors and a diode, hand-picked in matched sets and run close to their breakdown voltage to squeeze usable radio-frequency performance out of early parts. The red triangles on the tuning dial are not decoration: they mark the CONELRAD frequencies at 640 and 1240 kHz, the two channels American broadcasters were told to use in a civil-defence emergency. Richard C. Koch, the project engineer at I.D.E.A., patented it.

Six weeks and a telephone

I.D.E.A. had no industrial design department and outsourced the case to Painter, Teague and Petertil. The design was worked up in six weeks, largely by telephone and by sketches posted back and forth, and it earned an award from the Industrial Design Society of New York before the Museum of Modern Art picked the TR-1 for its American Art and Design exhibition in Paris in 1955.

That recognition is worth noting because it shows what the TR-1's real product was. Plenty of people could have built a radio with four transistors. Almost nobody had thought to build one that looked like something you would want to carry.

What it did to the radio business

The TR-1 proved the market. The set that took it over was Japanese, smaller and cheaper: the Sony TR-63 in 1957, which made the transistor radio the most popular consumer electronics device of the 1960s and 1970s. Billions were built, and by about 2012 the category had been counted out at that scale.

The pocket radio then did to music what it had done to hardware, moving listening out of the living room and into wherever the owner happened to be. Around 1980 the cheap AM set was itself pushed aside by the boombox and then by the Sony Walkman, which arrived on this timeline in 1979 and inherited the TR-1's central idea: a personal device, small enough to take anywhere, playing exactly what its owner chose.