In 1948, six friends pooled $22,000 in a Palo Alto garage to sell a vacuum tube most engineers had never heard of. Within a decade, that tube would guide airliners through fog, power the first satellite communications, treat cancer patients, and quietly become the beating heart of the American radar shield during the Cold War. The company was Varian Associates, and the tube was the klystron.

The klystron itself has a beautifully simple premise: shoot a beam of electrons through a series of resonant cavities, and let a weak microwave signal in the first cavity "bunch" the electrons together. By the time those bunches reach the output cavity, they've been amplified into a signal thousands of times more powerful. Russell and Sigurd Varian invented it in 1937 at Stanford, working alongside physicist William Hansen. Sigurd was a Pan Am pilot who wanted a way to see through fog; Russell was the physicist who figured out how.

What makes Varian Associates fascinating isn't just the technology — it's the corporate DNA the founders baked in. They insisted on:

• Profit sharing for every employee, from janitor to CEO — radical for 1948
• Stock options for all workers, decades before this became Silicon Valley orthodoxy
• A close partnership with Stanford, leasing land from the university in what would become the Stanford Industrial Park — the first tech park in the world

That last point is the hidden bombshell. Varian was the first tenant of what would become Silicon Valley. Hewlett-Packard, Fairchild, Lockheed, and eventually every tech giant you can name followed the template Varian established: former Stanford researchers, university-adjacent real estate, employee equity, government contracts. If you've ever wondered why the semiconductor industry clustered around Palo Alto rather than Boston or Chicago, the answer traces back to a klystron tube factory.

The klystron itself never stopped mattering. It powers the SLAC linear accelerator (two miles of them, actually). It's inside medical linear accelerators bombarding tumors at hospitals worldwide — a business Varian spun off and which still exists as Varian Medical Systems, now part of Siemens Healthineers. Klystrons drove NASA's Deep Space Network, letting us hear Voyager whisper from beyond the heliopause. And the reflex klystron — a variant using just one cavity — was standard in radar receivers for decades.

The company's photography connection is delightfully unexpected too: Russell Varian was close friends with Ansel Adams, and after Russell died in 1959, Adams named a photograph "Sand Dunes, Oceano" in his memory, drawing from a Robinson Jeffers poem the two had discussed. The man who bent electron beams was memorialized in silver gelatin.

Varian Associates itself was broken up in 1999, splitting into Varian Medical Systems, Varian Semiconductor, and Varian Inc. — each of which became a multi-billion-dollar company on its own. Not bad for a garage startup selling glowing tubes.