Prywatna Wytwórnia Lamp is Aleksander Zawada's one-man vacuum tube factory, now housed in Warsaw's Institute of Vacuum Technology (Zawada's original vacuum tube factory was in his apartment). Sébastien Bourdeauducq met Zawada and did a great writeup on his handcrafted valves -- and no, it's nothing like Portlandia's artisinal lightbulbs.
He starts the triode by assembling the grid. To do this, he takes a piece of nickel wire, and soldered a small spiral of molybdenum wire on it – one turn and one solder at a time. He uses molybdenum because of its low emission of free electrons when heated (which causes unwanted grid current in tubes) and its high melting point. Soldering is done with a spot welding machine, which passes high current through the parts to be soldered (nickel and molybdenum wires). The current is so high that the metals heat and melt locally and form a small solder spot. How does one obtain such a high current? Aleksander simply took the transformer of a microwave oven, removed the high voltage secondary, and wound instead a few turns of a thick aluminum bar whose ends are connected to the copper electrodes of the welding machine. The solder current can be controlled by a triac-based dimmer connected in series with the transformer’s primary...
As a cheap source of bulbs, Aleksander uses glass enclosures he easily obtained from light bulb factories – they had plenty of surplus stock when incandescent lights were removed from sales in Europe.
Now, let’s assemble the electrodes and the bulb together. He does that by melting the bulb into the base, by rotating it and heating the bottom with a propane torch. Of course, the spinner is also made of junk materials – this time, a turntable that was originally intended to play vinyls.
Alan Turing and the codebreakers of Bletchley Park invented modern crypto and computers in the course of breaking Enigma ciphers, the codes that Axis powers created with repurposed Enigma Machines — sophisticated (for the day) encryption tools invented for the banking industry — to keep the Allies from listening in on their communications.
In 1948, the Institute of Applied Science commissioned an unknown illustrator to depict a fistful of squirming, terrified criminals caught in an authoritative fist, under the headline “CAUGHT BY THEIR FINGERTIPS” — they were advertising a home Criminal Investigation and Identification course.
Larkin Jones is a hardcore Pokemon fan who loses money every year on his annual Pokemon PAX party; he makes up the shortfall from his wages managing a cafe. This year, Pokémon Company International sued him and told him that even though he’d cancelled this year’s party, they’d take everything he had unless he paid […]
SitePoint Premium is the ultimate e-learning library for web developers, designers, and digital professionals. Famous for their web development books written by industry leaders, they’ve expanded their content library to include in-depth video courses and short, handy screencasts partnering with A Book Apart and UX Mastery. Whatever you want to achieve in your web career, […]
Skip the technical jargon and get right to taking amazing, professional-quality photos with this complete training. The Hollywood Art Institute Photography Course includes 22 modules filled with tutorials on how to profit off of your photography, or simply capture your memories in the manner they deserve.Accredited by the Photography Education Accreditation CouncilDive into this 22 […]
Power up your gadgets in the most unexpected places with the extremely compact SolarJuice battery pack. SolarJuice charges up at home like your average battery pack, but also lets you add extra juice on-the-go using its built-in solar panel—so you’ll never be left unplugged from the digital world.4.5 Stars on Amazon!Simultaneously charges 2 devices at […]