Category Archives: vacuum tube

Swap Your Microwave for a High Voltage Stereo

When building a new project, common wisdom suggests to avoid “reinventing the wheel”, or doing something simple from scratch that’s easily available already. However, if you can build a high-voltage wheel, so to speak, it might be fun just to see what happens. [Dan] decided to reinvent not the wheel, …read more

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Posted in audio, capacitor, danger, fire, high voltage, magnetron, microwave, science, speaker, vacuum tube | Leave a comment

Tubes Have Character with a Tek 570

When tubes were king, you could go to a drugstore with a box full of them from your TV. There would be a tester that would tell you what tubes were bad and, of course, you could buy the replacements for them. That kind of tube tester was pretty simple. …read more

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Posted in curve tracer, tektronix, tektronix 570, tool hacks, tube, vacuum tube | Leave a comment

A Stunning Ray Gun Built From Junk

If ever there was a quintessential weapon of science fiction, it would have to be the ray gun. [lonesoulsurfer] built this one-of-a-kind stunner from his impressive collection of junk. It’s centered around a vintage Bakelite soldering gun, a vacuum tube, and a portable stove burner, all of which contribute to …read more

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Posted in Bakelite, blaster, Microcontrollers, pew pew pew, phaser, ray gun, soldering gun, vacuum tube | Leave a comment

A Dancing Cowboy Nixie Tube

If there were four words you never expected to hear in sequence, they would probably be “Dancing cowboy Nixie tube”. But that’s just what [Glasslinger] has made, and it’s exactly what it sounds like – an encapsulated cowboy that dances.

We’ve placed the resulting video below the break, and in …read more

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Posted in glassblowing, nixie, parts, vacuum tube | Leave a comment

New Circuits with Old Technology

Before the invention of transistors, vacuum tubes ruled the world. The only way to get amplification or switching (or any electrical control of current) back then was to use tubes. But some tube design limitations were obvious even then. For one, they produce an incredible amount of heat during normal …read more

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Posted in amplifier, circuit, classic hacks, radio, transistor, vacuum tube | Leave a comment

Vintage Monoscope Tubes Generate Classic TV Test Patterns Once Again

Night creatures and insomniacs of a bygone era may fondly recall a TV test pattern appearing once [Jack Parr] or [Steve Allen] had had their say and the local TV station’s regular broadcast day had concluded. It was affectionately known as the Indian Head test pattern, for the stylized Native …read more

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Posted in classic, classic hacks, monoscope, ntsc, orthicon, retro, test pattern, vacuum tube, video, vidicon, vintage | Leave a comment

Retrotechtacular: How Not to Design With Transistors

Consider the plight of a mid-career or even freshly minted electrical engineer in 1960. He or she was perched precariously between two worlds – the proven, practical, and well-supported world of vacuum tube electronics, and the exciting, new but as yet unproven world of the transistor. The solid-state devices had …read more

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Posted in comparative, design, electrical engineering, electron tube, Hackaday Columns, Retrotechtacular, transistor, vacuum tube | Leave a comment

Rebuilding The First Vocal Encryption System

Back in the early days of radio, it was quickly apparent that the technology would revolutionize warfare, but only if some way could be found to prevent enemies from hearing what was said. During World War II, the Allies put a considerable amount of effort into securing vocal transmissions, resulting in a system called SIGSALY – 50 tons of gear developed by Bell Laboratories with the help of Alan Turing that successfully secured communications between the likes of Churchill and Roosevelt during the war.

Now, a small piece of the SIGSALY system lives again, in the form of a period-faithful …read more

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Posted in adc, classic hacks, crypto, encryption, quantizer, SIGSALY, thyratron, vacuum tube, vocoder | Leave a comment

A Dozen Tubes Make An Educational Amplifier

If you asked [Hans_Daniel] what he learned by building a tube audio amplifier with a dozen tubes that he found, the answer might just be, “don’t wind your own transformers.” We were impressed, though, that he went from not knowing much about tubes to a good looking amplifier build. We also like the name — NASS II-12 which apparently stands for “not a single semiconductor.”

Even the chassis looked really good. We didn’t know textolite was still a thing, but apparently, the retro laminate is still around somewhere. It looks like a high-end audio component and with the tubes proudly …read more

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Posted in audio, audio amplifier, classic hacks, tube, tubes, vacuum tube, vacuum tube audio | Leave a comment

Philo Farnsworth, RCA, and the Battle for Television

The parenthood of any invention of consequence is almost never cut and dried. The natural tendency to want a simple story that’s easy to tell — Edison invented the light bulb, Bell invented the telephone — often belies the more complex tale: that most inventions have uncertain origins, and their back stories are often far more interesting as a result.

Inventing is a rough business. It is said that a patent is just a license to get sued, and it’s true that the determination of priority of invention often falls to the courts. Such battles often pit the little guy …read more

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Posted in Biography, broadcasting, camera, cesium oxide, Engineering, Farnsworth, image dissector, Original Art, RCA, television, vacuum tube, video | Leave a comment