Chicago, 1948. A rented garage, a pile of broken televisions, and two men who had run out of patience with guesswork. By that year, the American living room was changing faster than the technology supporting it could keep up with. Television, still barely a few years removed from experimental broadcasts and wartime government restrictions, had become a consumer product almost overnight.
Manufacturers shipped sets by the millions. Families who had never seen moving images inside their homes suddenly had a glowing device in the corner of a room. The problem was that the technology inside those sets was anything but forgiving. A television in 1948 was built around vacuum tubes and a cathode-ray tube, both of which were accustomed to failing without warning.
A set that worked on Tuesday might not work on Thursday. Repair, not replacement, was the only economic option for most families, and repair shops began spreading across the country to meet the demand. Chicago had the industrial infrastructure to let that kind of trade grow quickly. It had a dense network of electronics manufacturers and parts suppliers left over from wartime production, along with a workforce of men who had spent years maintaining radios and radar for the military.
When that expertise turned toward civilian television repair, the city was left with the tools, supply chains, and a customer base already in place. Two men working in Chicago saw this problem from the inside. Philip Ban ran a television repair operation. His partner, Carl Korn, was an entrepreneur interested in electronics and a passion for test instruments.
According to company records kept by B&K Precision itself, the two men found that the tools available for diagnosing a malfunctioning set were either too expensive for a small shop or did not exist at all. A technician could replace parts based on experience and a bit of luck, but there was no affordable way to test a tube or the picture tube and know with confidence what was wrong. So they built their own instruments. The documented facts do not need much embellishment.
Ban and Korn were not university-trained instrument designers working with a corporate research budget. They worked from a garage, building devices meant to solve a problem they faced every day in their own repair business. They opened a shop under the name Central Television Service, and there they began using, and eventually selling, the test equipment they had built. Word spread the usual way among tradesmen in a single city.
One repairman heard from another that there was a way to know what was wrong with a set before opening it up. Two devices in particular supported the business early on. The first was a cathode-ray tube rejuvenator, a machine that could restore a worn-out picture tube instead of forcing the shop to buy a new replacement. That was a major saving at a time when a new tube cost a significant portion of the entire repair job.
The second was a vacuum tube tester, which allowed a technician to check every tube in a set within minutes rather than pulling them out one by one and swapping them to see what happened. The tube tester worked by isolating a single tube from the rest of the circuit and running it through a set of standard electrical checks, measuring emission, checking for shorts between elements, and comparing the result against a known good reading for that type of tube. The CRT rejuvenator worked by applying a carefully controlled burst of current to the cathode of the picture tube, essentially cleaning and reactivating the emissive coating that had worn away with time and use. It could not fix a damaged tube completely, but it gave an exhausted tube a few extra months, sometimes years, of usable life.
For a family on a budget in 1949, that was exactly what they needed. By 1951, the side business had grown enough for Ban and Korn to give it a formal identity. They called it the B&K Precision Corporation. The B for Ban, the K for Korn.
A simple naming style, as unpretentious as the products themselves. Within the young company, engineering design matched the pricing philosophy. B&K engineers filed patents for their television test equipment during this period, which matters for a simple reason. It tells us the work was original, not just a cheaper copy of something a larger company had already designed.
Quality and low price were treated as compatible goals here, not as competing choices. The company’s market positioning was also unusually deliberate for its size. The big instrument manufacturers of that era generally chased military contracts and corporate engineering budgets, markets where price mattered less than performance specifications. B&K Precision targeted a completely different customer: the independent television repair technician, the vocational school, the field technician working on thin margins in a small shop.
For that customer, the price of a tool was not an abstract idea. It was the difference between taking a job or turning it away. In 1961, Carl Korn placed B&K Precision under a new holding structure called Dynascan Corporation. This was not a sale.
Korn remained in control of the business. Dynascan was a holding company formed by combining several small Chicago electronics companies, B&K Precision among them, under one corporate umbrella. For a time, nothing changed in the daily life of B&K Precision. The company kept its name, its product line, and continued selling test equipment to the same repair shops and technical schools it had always dealt with.
Dynascan as a whole had broader ambitions, and one of its early diversifications is almost forgotten today, a line of remote-controlled material handling equipment sold under the name Telemotive, used to operate industrial cranes in mining, construction, and shipping. It did not last long, and it is not why anyone remembers Dynascan today. What people remember is what came next. The United States government had opened the radio spectrum for Citizens Band use in 1958, but for years almost no one used it.
CB radio was a niche interest, a handful of hobbyists, a few truck drivers, nothing like a mass market. In 1963, Dynascan brought a CB radio called the Sidewinder to market. It was among the first Citizens Band radios sold to the general public. Early enough that, according to accounts from some collectors, the first versions were still basic rigs, a single sideband model with only six channels controlled by crystals, built at a time when almost no one outside the small hobbyist community had any use for it.
It was not, in other words, an obviously promising product. The radio that followed the Sidewinder carried a new name, Cobra, and that name would come to define the company’s entire second identity. For several years in its early stage, Dynascan manufactured its own CB radios, but in 1971, as CB use began spreading beyond hobbyists and truck drivers to the general public, the company shifted to importing low-cost radios made in Japan by Toshiba and Uniden. That decision lowered the price of entry for consumers at exactly the moment consumer interest was accelerating.
The figures from that period are documented in the business histories of the era. Dynascan’s revenue rose from about 13. 8 million dollars in 1973 to about 102 million in 1976, nearly a sevenfold increase in three years, with gross profits of roughly 15 million dollars by 1976. Carl Korn now faced a decision that looks inevitable in hindsight, though it likely did not seem so at the time.
He could continue dividing Dynascan’s resources equally between a business growing at a modest, reliable pace and one growing at a pace most companies never experience even once. Or he could choose. He chose the radios. B&K Precision was sold, freeing Dynascan to commit itself entirely to Cobra and the consumer electronics market forming around it.
The documented record is institutional, not emotional, but the sale was not simply a deal between strangers. It was, in a sense, the setting aside of one founder’s company in favor of another opportunity that had grown up alongside it. The CB radio boom did not last, and the way it ended offers a lesson. It turned out that part of CB radio’s popularity was closer to a passing fad than a sustainable market shift.
Just as the excitement began to cool, the FCC expanded the number of available CB channels from 23 to 40. Overnight, the 23-channel radios that made up a large part of Dynascan’s inventory became obsolete and practically unusable. A number of other CB manufacturers went out of the market entirely under similar pressure. Dynascan survived, partly by selling off its inventory through strong dealer promotions and relying on its other product lines, but the damage was real.
The company lost nearly 31 million dollars in 1984 alone. The response was diversification. During the 1980s, Dynascan developed a range of car audio products, speakers, and cassette players manufactured in East Asia to the company’s specifications, marketed as a higher-quality alternative to budget brands. The company also expanded into cordless phones, answering machines, and finally radar detectors and radio scanners, with the latter allowing users to listen to frequencies used by police departments.
In 1988, Dynascan acquired Lloyds Electronics. In 1989, the company introduced a product line bearing the Marantz brand aimed at premium buyers. By 1993, the Cobra brand had grown so far beyond its CB radio roots that the parent company adopted the name entirely, changing its corporate name from Dynascan Corporation to Cobra Electronics Corporation. The company continued as an independent business listed on the NASDAQ under the ticker COBRA for two more decades, eventually adding radar detectors, dashboard cameras, and marine radios to its catalog, becoming, by most estimates, the leading American brand in Citizens Band Radio.
That independence ended in 2014, when a New York private equity firm, Monomoy Capital Partners, acquired Cobra Electronics in a buyout valuing the company at around 28 million dollars. The following year, Monomoy merged Cobra Electronics with another portfolio company, the radar detector manufacturer Escort, to form a new holding entity called Cedar Electronics Holdings. The Cobra brand still exists today under that structure, continuing to sell marine radios, CB radios, radar detectors, and dashboard cameras, headquartered near the original Dynascan site in Chicago. When Korn sold B&K Precision to focus Dynascan on Cobra, the smaller company did not disappear.
It kept operating, manufacturing test equipment, serving the same repair shops and technical schools it had always served. Ownership changed several times over the 1960s, 1970s, and 1980s. None of the accounts suggest any dramatic reinvention during this period. No acquisitions, no major product shifts, no headline-worthy growth or collapse.
Each new owner inherited a small, stable company with a loyal if narrow customer base and a name that still meant something to the technicians who used its tools. That stability is itself impressive in its quiet way. Not many small manufacturers survive three decades of ownership transitions without losing their identity at some point. This company, by most accounts, did not.
That stability lasted until 1996, when a new owner looked at the company and apparently saw something none of the previous owners had. That year, an engineer named Victor Tolan led a new ownership group that acquired B&K Precision. He was not inheriting a struggling business. The company was financially stable, had a loyal customer base, and made instruments still well regarded by industry standards.
What he inherited was a company built around a market that was quietly shrinking. During the 1980s and into the 1990s, televisions became so cheap and reliable that repairing them was no longer economically practical for most households. A family with a broken television no longer called a technician; they bought a new set. The founding customer base of B&K Precision, the independent television repair shops around which Ban and Korn had built the entire company in 1948, was fading year after year with no way to reverse the trend.
Under Tolan’s ownership, the company responded by expanding far beyond television repair equipment. B&K Precision added power supplies, signal generators, oscilloscopes, spectrum analyzers, and multimeters to its catalog, not as minor extensions, but as entry points into entirely different categories of customers. Design engineers needed signal generators and oscilloscopes to develop products. Manufacturers needed power supplies and multimeters on production lines.
Technical schools and universities needed dependable instruments to train the next generation of engineers and technicians. None of these new customers cared much about the company’s origins in CRT rejuvenators and tube testers. What they cared about was whether the instrument on the table did what it claimed at a reasonable price for classrooms or a small engineering department. The company’s location changed along with its catalog.
B&K Precision moved its headquarters from Chicago to Yorba Linda, California. The move reflected access to suppliers and customers across Asia, where an increasing share of the world’s electronics manufacturing had shifted by the 1990s. In 2004, the company acquired Sefram Instruments, a test equipment manufacturer based in Saint-Étienne, France. That acquisition gave B&K Precision its own development, sales, and service infrastructure across Europe, the Middle East, and Africa.
Sefram still designs certain product lines under the B&K Precision umbrella today, including most of the company’s data acquisition and recording equipment, instruments used in fields like railway testing and transport engineering. A few years later, around 2011 or 2012 according to company documents, B&K Precision acquired the instruments division of Motec Industries, based in Taipei, Taiwan. The logic mirrored the earlier move to California, getting closer to the manufacturing ecosystem most important to the company’s supply chain and its increasingly Asian customer base. According to available records, B&K Precision still exists today, headquartered in Yorba Linda, California, and still privately owned, which is unusual for a company with that much international infrastructure.
It is not, and has never claimed to be, the biggest name in test and measurement equipment. That status belongs to much larger companies that dominate corporate engineering budgets and aerospace and defense contracts, exactly the market B&K Precision avoided since its earliest days in that Chicago garage. Instead, the company occupies a narrower space alongside a handful of modest competitors, serving universities, technical schools, small engineering departments, and field technicians who need reliable equipment without absorbing massive budgets. By most public estimates, B&K Precision today employs somewhere between a few dozen and a few hundred people, with annual revenue typically estimated in the tens of millions of dollars.
These are not headline figures. They were never meant to be. The company holds ISO 9001 certification, still lists universities and technical schools as core customers, and its instruments are regarded, by technician forums and equipment reviews, as reliable, inexpensive tools, much the same reputation the company had back in 1951. Victor Tolan, according to current company listings, still holds a leadership role at B&K Precision decades after leading the 1996 acquisition, a level of continuity unusual in an industry where ownership changes as often as this history demonstrates.
It is a strange split to consider. One partnership in a Chicago garage in 1948, two products, a picture tube rejuvenator and a vacuum tube tester, sold to repair technicians who needed those exact things and nothing else. From that single starting point, two companies emerged that would have looked, by the 1980s, as if they belonged to entirely different industries. One chased a consumer fad, survived its collapse through diversification, changed its name to match its most famous product, went public, then was acquired by an investment firm before being folded into a larger consumer electronics holding company.
The other stayed small, changed ownership quietly for thirty years, nearly lost its founding customer base as cheap disposable televisions appeared, reinvented its product catalog around engineers and educators instead of technicians, and expanded cautiously and gradually across three continents without ever becoming a household name. Neither path is more impressive than the other. Companies respond to the markets available to them. Dynascan responded to a consumer boom by building a consumer brand.
B&K Precision responded to a shrinking market by finding a new one that valued what the company already knew how to do well. Both, in their own way, were doing what Ban and Korn did in 1948, solving the problems actually in front of them for whatever customer needed the solution. What is most striking about looking at the two companies side by side is how differently survival ultimately looked for each. Cobra survived by becoming something much larger than its origins, then eventually turned into a brand owned by an investment firm rather than being an independent company at all.
Its name remained the same, but its ownership structure became entirely separate from that Chicago garage where the original idea began. B&K Precision survived by staying almost the same size it had always been, merely targeting a different customer. One company expanded and eventually lost its independence in the process. The other maintained its independence by mostly refusing to expand.
Neither outcome was inevitable, and neither appears to have been fully intended at the time. Seventy-eight years after two men built test instruments in a Chicago garage because affordable alternatives did not exist, a version of that same instinct still guides the company that carries their initials. Instruments built to work, priced for the person who actually has to buy and use them, whether that person runs a repair shop that no longer exists or stands in front of a classroom of engineering students who have never touched a vacuum tube in their lives. Companies like B&K Precision rarely get documentaries made about them, and there is a good reason for that.
Nothing in their story resolves into a neat, final conclusion. There was no single dramatic founding moment beyond two men and a real, unglamorous problem. There was no villain in the later sale of Dynascan, no hero in Victor Tolan’s 1996 reinvention of the company.
Just a series of people over seventy years making the most reasonable decision available to them at the time, based on the information they actually had.