History as always been one of my main interests, covering the entire period from pre-history to modern times. As long it is covering an interesting period and well written - and with maps and good illustrations! - I read everything. As an engineer technology history has a special place, especially when it has links with my own interests or activities. So here you will find a few results of my digging up stories. I started with those where my father and his 1947 home-built TV were involved, but more will probably follow.

Piet Hooijmans 1918-2006

The career of my father in engineering and the surprising technologies he worked on. This is also the trigger for the more detailed stories on early television development, including my father's home-built television from 1947, as well as the EQ40/80 and tuner history.

Piet's Home-built Television, or how Philips developed television, part 1 1946-1949

Triggered by the 1948 home-built television of my father, I've tried to reconstruct the early developments that lead to the first television sets. It covers activities of Philips Research, the Radiobuizen Lab and the Apparaten Lab. Includes the story of the Philips 567-line standard development and the PET experimental transmissions from Eindhoven.

Piet's Home-built Television, or how Philips developed television, part 2 1950-1958

The 2nd part of the story, starting with the new 625-line TV standard and covering the first five generations of TV sets, as well as the build-up of the valve, picture tube and television factories. Includes analysis of the innovation steps in each successive set, the struggle with the many different standards across Europe and the story on the Protelgram back-projection TV's.

The EQ40/EQ80 enneode

The development, principles and applications of this unique 9-electrode valve on which my father worked as a young engineer and that was also used in his home-built TV receiver. Includes the overview of all known applications of the EQ40 and EQ80, in FM radio, television and professional applications.

Philips tuner history pt1: valve-based VHF tuners

Detailed description of the evolution of the television channel selector, or tuner, from the first 1947 post-war televisions to the mass-produced 12-channel drum tuners towards the end of the 1950s. Contains overviews of circuit evolution, the types produced, their application linked to the simultaneously evolving TV standards, as well as sections on tuner RF reception theory.

Philips tuner history pt2: introduction of UHF

UHF tuners, covering the 470-860MHz band, was a real challenge around 1960, requiring mass-producible modules operating at unprecedentedly high frequencies. In parallel the VHF tuners continued to evolve driven by the new frame grid valves. And major effort was put into more user friendly channel selection and tuning mechanisms, including such advanced solutions as motor controlled tuning.

Philips tuner history pt3: transistors, varicaps and a bit of colour

In 1963 the first transistorized UHF tuners appear, followed a year later by the first VHF tuner. All based on germanium transistors, that would remain the dominant component until replaced by the silicon transistor between 1970 and 1980. In the meantime another important key component was introduced: the varicap, allowing electronic tuning. This in turn supported much innovation in the way channel selection was performed. All this in parallel with the emergence of colour TV.

Coming
soon

Philips tuner history pt4: integrated circuits

With the UV400 family the first ICs were introduced inside the tuner: pre-scalers. Over 20 years this would extend to the mixer-oscillator, PLL and MOPLL. In parallel the tin can Front End came up for high end sets: tuner and IF in a single module. Other RF modules in consumer electronics were the video modulator and the satellite front end. All this against the background of upcoming Japanese competition.

Coming
later

Philips tuner history pt5: the silicon tuner

Due to the continued improvement of the (RF) IC technology the impossible became possible: a fully integrated tuner on a single silicon die with an off-air performance similar to the standard can tuners. This in turn had major impact on the module business, which in the end didn't make and was sold, bringing to an end more than 60 year Philips tuner activities.