electron tubes


Hey everyone!

Here are the final pictures of the Graetz Melodia radio. The owner has it in his possession now, so the project is officially done and closed. This has been a long one… over a year of working on it (on and off).

I learned a lot during this project and had a lot of fun bringing this beautiful radio back to life.

Next up… continue on with the Philco 39-45, and possibly work on one of my own personal radio projects (Gasp!).

Anyway… thanks for following along with this one and until next time…

Stay tuned!

Me (An Astronomy Nerd) in Astrophysics...

Teacher: *showing us emission spectra* “So, as you can see, when we energize different types of gasses, they emit different specific wavelengths of light.”
Me (INTJ): *whispering to ISTJ friend* “Well, that’s a gross oversimplification. Want to actually know how it all works?”
ISTJ Best Friend: “Not particularly, no.”
Me: “Aww, come on, but it’s really cool!”
ISTJ BF: *knowing I really like talking about this stuff* “Fine.”
Me: *psyched that she’s actually listening to me* “Ok, well when the gas is excited by the electricity going through the tube, the electrons jump to…” (end up explaining the theory why electrons can’t exist between energy levels)
ISTJ BF: “Woah there, I thought this was going to be a short, easy-to-follow explanation.”
ISTJ BF: “Yeah, I guess I should have figured. You just better hope he doesn’t put anything related to this as a short answer on the test. You’d never finish.”


Greetings everyone!

Spent time today working on the Philco 39-45. Decided to concentrate my efforts on the output section. This is where the radio signal goes through final amplification before running through the output transformer to the speaker. 

As you can see from the first few pictures, all of the components are old (original), and that blue capacitor you can see in the second picture is not supposed to be there. Some time in the past the owner added an ‘input’ for a record player which tied in through that capacitor to the speaker. The current owner didn’t want that accessory, so I removed it.

First I removed the output transformer so I could more easily get at the capacitors underneath. Then slowly went through and replaced the rest of the components. I ended up replacing pretty much everything since the capacitors were old, the resistors were out of tolerance (supposed to be 490k, measured over 700k), and the wires were shot.

In the last picture, I’ve got some parts soldered in, others are just twisted in place for now until I get all of the various layers of parts in place. It was a pretty time-consuming process since I had to remove everything, clean the terminals, then rebuild it. Don’t know if I’m going to do much on it this week since it’s supposed to be 100+deg most of the week, but I’ll post pics if I have them.

Till next time, stay tuned!

Why Didn’t You Try Harder? (Banner/Stark x reader)

1. Could you pretty please do 8 with Tony Stark? Maybe reader accidentally broke some of his equipment and Tony was already having a bad day? Thank you! (I live breathe and sleep your fics because they are amazing!!!!)

2.  #35 “Well, I wasn’t expecting that.” Tony and reader in a heated, sarcastic argument. End with a confession?

Shitshitshitshitshit,” you mumbled to yourself, trying desperately to fix the incredibly intricate and incredibly expensive looking tool that you had just broken.  “Bruce, do you know how to fix this?  Please tell me you know how to fix this.”  You hurried to his side and showed him the two pieces in your hand, watching as he inspected each of them.

“Well,” he sighed, sliding on his glasses to take a closer look, “I think this might go here…wait, maybe here…no…there…” He fumbled with it a few more minutes, his tongue poking from the corner of his mouth in deep concentration.  “Well, as far as I can tell, you broke it.” 

You stood still and stared at him blankly as he tried to hand the pieces back to you, disbelieving what he was saying.  “You’re supposed to be one of the great minds of the century, and that’s all you’ve got?”

“I’m not wrong,” he smirked.

Why didn’t you try harder?”

“I could say the same to you.”  The doctor cleared his throat and nodded towards the door behind you, signaling that Tony had arrived for the day.  “Watch your back.”

“Morning, children,” Tony greeted you both as he settled into his workstation, “daddy’s home.”

“Tony,” you replied quietly, turning to face him and pushing the broken pieces across the table behind you. “No coffee today?”

He quickly looked around the table, now realizing that he had forgotten his mug in the kitchen.  “Well, dammit.  I guess not.”

“You can’t start your day without it.  Maybe you should go grab it before you get too far along?”  You shot a quick glance at Bruce when you heard him snicker quietly from across the room, sensing immediately what you were trying to do to buy time to hide your mistake.  “Or maybe Bruce wants to go get it for you?” you hissed through clenched teeth.

“What’s behind your back, (Y/N)?” Tony asked, slowly moving towards you with a worried look on his face. You tried to grab the pieces before he reached you, but you didn’t move fast enough.  “Gimme,” he commanded, holding out his hand.

You took a deep breath and grimaced, “you might need both hands.”  When you brought the pieces around for him to see, his eyes widened and you could’ve sworn that he actually got a little pale.  “Sorry, Tony.

“Um, (Y/N)?” he began quietly, “do you know how much this cost?”

“I’m going to say more than I’ll make in my lifetime?”

“Times a hundred, give or take.”  He took the tool in his hands and flipped it around slowly, groaning under his breath as he inspected it.  “Do you know why it was so expensive?”

You paused for a moment, finding the answer fairly quickly and to be pretty obvious.  “Because you invented it, using rare materials and it’s one of a kind?”

“For someone as smart as you, you’d think you wouldn’t break things so easily,” he snapped, throwing the tool with a slam into the nearby garbage.  

“Well for someone as smart as you, you’d think you would make more than one when you had the chance.” You followed behind him as he returned to his table, not willing to back down so quickly.  “Or better yet, if you’re going to make a one of a kind and irreplaceable thing, just put it up for display instead so we can all bask in the magnificence that is your genius.  Why make something that we could actually use?”

He turned quickly to face you and held his hand up to keep you at a distance.  “Wait, how is this now about me?”

“Isn’t everything?”

“Oh, that’s how we’re gonna play?” he said in a sarcastic tone.  “Okay, so if this is all about me, who broke the Photovoltaic Intermediate?”

“Me,” Bruce mumbled from his station, almost too quietly to hear.  Tony looked at him quizzically, not sure if he had heard him right, but continued on.

“Alright then, how about the Electron Diffraction Tube?”

“Yeah, that was still me,” Bruce replied again, keeping his hands and eyes on his work, not looking up at either of you as you stared at him.

Tony crossed his arms over his chest, now starting to wonder if his friend had been the problem all this time and allowed you to take the blame.  “Ok, big green, what about the Biconvex Lenses that I had in the drawer over there?” he all but yelled, pointing to a cabinet next to his own table.

“Sorry,” Bruce mumbled, coughing slightly.  “I did that almost three months ago.”

Between the look of surprise on Tony’s face and your silence at the revelation that Bruce was more of a hazard to the equipment than you were, both you and Tony separated and proceeded to your individual work in silence for the rest of the day. Standing at a table directly across from the doctor, you waited for him to look up at you, and when he did you shook your head with both disapproval surprise.  

Well, I wasn’t expecting that.”

How Else Would You Get An Email?

Me: Could you please send me the confirmation email you received? It should have a link to download the document and/or have a PDF of the doc as an attachment. 

Client: Would I have received that electronically?


The Price of Genius - Benedict Cumberbatch cover

Alan Turing, the intellectual father of the modern computer, had a theory. He believed that one day machines would become so powerful that they would think just like humans. He even devised a test, which he called “the imitation game,” to herald the advent of computers that were indistinguishable from human minds. But as Benedict Cumberbatch’s performance in the new movie The Imitation Game shows, Turing’s heroic and tragic life provides a compelling counter to the concept that there might be no fundamental difference between our minds and machines.

As we celebrate the cool inventions that sprouted this year, it’s useful to look back at the most important invention of our age, the computer, which along with its accoutrements, microchips and digital networks is the über innovation from which most subsequent Ubers and innovations were born. But despite the computer’s importance, most of us don’t know who invented it. That’s because, like most innovations of the digital age, it has no single creator, no Bell or Edison or Morse or Watt.

Instead, the computer was devised during the early 1940s in a variety of places, from Berlin to the University of Pennsylvania to Iowa State, mainly by collaborative teams. As often seen in the annals of invention, the time was right and the atmosphere charged. The mass manufacture of vacuum tubes for radios paved the way for the creation of electronic digital circuits. That was accompanied by theoretical advances in logic that made circuits more useful. And the march was quickened by the drums of war. As nations armed for conflict, it became clear that computational power was as important as firepower.

Which is what makes the Turing story especially compelling. He was the seminal theorist conceptualizing the idea of a universal computer, he was part of the secret team at Bletchley Park, England, that put theory into practice by building machines that broke the German wartime codes, and he framed the most fundamental question of the computer age: Can machines think?

Having survived a cold upbringing on the fraying fringe of the British gentry, Turing had a lonely intensity to him, reflected in his love of long-distance running. At boarding school, he realized he was gay. He became infatuated with a fair-haired schoolmate, Christopher Morcom, who died suddenly of tuberculosis. Turing also had a trait, so common among innovators, that was charmingly described by his biographer Andrew Hodges: “Alan was slow to learn that indistinct line that separated initiative from disobedience.”

At Cambridge University, Turing became fascinated by the math of quantum physics, which describes how events at the subatomic level are governed by statistical probabilities rather than laws that determine things with certainty. He believed (at least while he was young) that this uncertainty and indeterminacy at the subatomic level permitted humans to exercise free will–a trait that, if it existed, would seem to distinguish them from machines.

He had an instinct that there were mathematical statements that were likewise elusive: we could never know whether they were provable or not. One way of framing the issue was to ask whether there was a “mechanical process” that could be used to determine whether a particular logical statement was provable.

Turing liked the concept of a “mechanical process.” One day in the summer of 1935, he was out for his usual solitary run and stopped to lie down in a grove of apple trees. He decided to take the notion of a “mechanical process” literally, conjuring up an imaginary machine and applying it to the problem.

The “Logical Computing Machine” that Turing envisioned (as a thought experiment, not as a real machine to be built) was simple at first glance, but it could handle, in theory, any mathematical computation. It consisted of an unlimited length of paper tape containing symbols within squares; the machine would be able to read the symbols on the tape and perform certain actions based on a “table of instructions” it had been given.

Turing showed that there was no method to determine in advance whether any given instruction table combined with any given set of inputs would lead the machine to arrive at an answer or go into some loop and continue chugging away indefinitely, getting nowhere. This discovery was useful for the development of mathematical theory. But more important was the by-product: Turing’s concept of a Logical Computing Machine, which soon came to be known as a Turing machine. “It is possible to invent a single machine which can be used to compute any computable sequence,” he declared.

Turing’s interest was more than theoretical, however. Fascinated by ciphers, Turing enlisted in the British effort to break Germany’s military codes. The secret teams set up shop on the grounds of a Victorian manor house in the drab redbrick town of Bletchley. Turing was assigned to a group tackling the Germans’ Enigma code, which was generated by a portable machine with mechanical rotors and electrical circuits. After every keystroke, it changed the formula for substituting letters.

Turing and his team built a machine, called “the bombe,” that exploited subtle weaknesses in the German coding, including the fact that no letter could be enciphered as itself and that there were certain phrases that the Germans used repeatedly. By August 1940, Turing’s team had bombes that could decipher German messages about the deployment of the U-boats that were decimating British supply convoys.

The bombe was not a significant advance in computer technology. It was an electromechanical device with relay switches rather than vacuum tubes and electronic circuits. But a subsequent machine produced at Bletchley, known as Colossus, was a major milestone.

The need for Colossus arose when the Germans started coding important messages, including orders from Hitler, with a machine that used 12 code wheels of unequal size. To break it would require using lightning-quick electronic circuits.

The team in charge was led by Max Newman, who had been Turing’s math don at Cambridge. Turing introduced Newman to the electronics wizard Tommy Flowers, who had devised wondrous vacuum-tube circuits while working for the British telephone system.

They realized that the only way to analyze German messages quickly enough was to store one of them in the internal electronic memory of a machine rather than trying to compare two punched paper tapes. This would require 1,500 vacuum tubes. The Bletchley Park managers were skeptical, but the team pushed ahead. By December 1943–after only 11 months–it produced the first Colossus machine. An even bigger version, using 2,400 tubes, was ready by June 1, 1944. The machines helped confirm that Hitler was unaware of the planned D-Day invasion.

Turing’s need to hide both his homosexuality and his codebreaking work meant that he often found himself playing his own imitation game, pretending to be things he wasn’t. At one point he proposed marriage to a female colleague (played by Keira Knightley in the new film), but then felt compelled to tell her that he was gay. She was still willing to marry him, but he believed that imitating a straight man would be a sham and decided not to proceed.

After the war, Turing turned his attention to an issue that he had wrestled with since his boarding-school friend Christopher Morcom’s death: Did humans have “free will” and consciousness, perhaps even a soul, that made them fundamentally different from a programmed machine? By this time Turing had become skeptical. He was working on machines that could modify their own programs based on information they processed, and he came to believe that this type of machine learning could lead to artificial intelligence.

In a 1950 paper, he began with a clear declaration: “I propose to consider the question, ‘Can machines think?’ ” With a schoolboy’s sense of fun, he invented his “imitation game,” now generally known as the Turing test, to give empirical meaning to that question. Put a machine and a human in a room, he said, and send in written questions. If you can’t tell which answers are from the machine and which are from the human, then there is no meaningful reason to insist that the machine isn’t “thinking.”

A sample interrogation, he wrote, might include the following:

Q: Please write me a sonnet on the subject of the Forth Bridge.

A : Count me out on this one. I never could write poetry.

Q: Add 34957 to 70764.

A: [Pause about 30 seconds and then give as answer] 105621.

Turing did something clever in this example. Careful scrutiny shows that the respondent, after 30 seconds, made a slight mistake in addition. (The correct answer is 105,721.) Is that evidence that the respondent was a human? Perhaps. But then again, maybe it was a machine cagily playing an imitation game.

Many objections have been made to Turing’s proposed test. “Not until a machine can write a sonnet or compose a concerto because of thoughts and emotions felt, and not by the chance fall of symbols, could we agree that machine equals brain,” declared a famous brain surgeon, Sir Geoffrey Jefferson. Turing’s response seems somewhat flippant, but it was also subtle: “The comparison is perhaps a little bit unfair because a sonnet written by a machine will be better appreciated by another machine.”

There was also the more fundamental objection that even if a machine’s answers were indistinguishable from a human’s, that did not mean it had consciousness and its own intentions, the way human minds do. When the human player of the Turing test uses words, he associates those words with real-world meanings, emotions, experiences, sensations and perceptions. Machines don’t. Without such connections, language is just a game divorced from meaning. This critique of the Turing test remains the most debated topic in cognitive science.

Turing gave his own guess as to whether a computer might be able to win his imitation game. “I believe that in about 50 years’ time it will be possible to program computers … so well that an average interrogator will not have more than a 70% chance of making the right identification after five minutes of questioning.”

Fooling fewer than a third of interrogators for only five minutes is a pretty low bar. Still, it’s now been more than 60 years, and the machines that enter Turing-test contests are at best engaging in gimmicky conversational gambits. The latest claim for a machine having “passed” the test was especially lame: a Russian program pretended to be a 13-year-old from Ukraine who didn’t speak English well. Even so, it fooled barely a third of the questioners for five minutes, and no one would believe that the program was engaging in true thinking.

A new breed of computer processors that mimic the neural networks in the human brain might mean that, in a few more years or decades, there may be machines that appear to learn and think like humans. These latest advances could possibly even lead to a singularity, a term that computer pioneer John von Neumann coined and the futurist Ray Kurzweil and the science-fiction writer Vernor Vinge popularized to describe the moment when computers are not only smarter than humans but also can design themselves to be even supersmarter and will thus no longer need us mortals. In the meantime, most of the exciting new inventions, like those in this issue, will involve watches, devices, social networks and other innovations that connect humans more closely to machines, in intimate partnership, rather than pursuing the mirage of machines that think on their own and try to replace us.

The flesh-and-blood complexities of Alan Turing’s life, as well as the very human emotions that drove him, serve as a testament that the distinction between man and machine may be deeper than he surmised. In a 1952 BBC debate with Geoffrey Jefferson, the brain surgeon, this issue of human “appetites, desires, drives, instincts” came up. Man is prey to “sexual urges,” Jefferson repeatedly said, and “may make a fool of himself.”

Turing, who was still discreet about his sexuality, kept silent when this topic arose. During the weeks leading up to the broadcast, he had been engaged in a series of actions that were so very human that a machine would have found them incomprehensible. He had recently finished a scientific paper, and he followed it by composing a short story, which was later found among his private papers, about how he planned to celebrate. “It was quite some time now since he had ‘had’ anyone, in fact not since he had met that soldier in Paris last summer,” he wrote. “Now that his paper was finished he might justifiably consider that he had earned another gay man, and he knew where he might find one who might be suitable.”

On a street in Manchester, Turing picked up a 19-year-old working-class drifter named Arnold Murray, who moved in with him around the time of the BBC broadcast. When Turing’s home was burglarized, he reported the incident to the police and ended up disclosing his sexual relationship with Murray. Turing was arrested for “gross indecency.”

At the trial in March 1952, Turing pleaded guilty, though he made it clear he felt no remorse. He was offered a choice: imprisonment or probation contingent on receiving hormone injections designed to curb his sexual desires, as if he were a chemically controlled machine. He chose the latter, which he endured for a year.

Turing at first seemed to take it all in stride, but on June 7, 1954, at age 41, he committed suicide by biting into an apple he had laced with cyanide. He had always been fascinated by the scene in Snow White in which the Wicked Queen dips an apple into a poisonous brew. He was found in his bed with froth around his mouth, cyanide in his system and a half-eaten apple by his side.

The imitation game was over. He was human.

Isaacson, a former managing editor of Time, is the author of The Innovators: How a Group of Hackers, Geniuses, and Geeks Created the Digital Revolution, from which parts of this piece are adapted

This appears in the December 1, 2014 issue of TIME.


Blaise Pascal and the first Modern Calculator

When the word calculator entered English in the late 14th century, it referred to a mathematician or person who calculated or tabulated things.  The word calculator derived from the Latin word of the same spelling, from the past participle of calculare, meaning to reckon or compute.  The Latin word calculare had its own interesting derivation, coming from the diminutive of calx, as calculus, meaning a pebble or counting stone as it is supposed that early Roman mathematicians and accountants used pebbles to aid in large calculations.  It wasn’t until 1784 that word was used to denote a mechanical contraption to count or perform math and wasn’t applied to an electronic device until June 1946, when a Scientific American headline announced “Electronic calculator uses 18,000 tubes to solve complex problems.”

French philosopher and mathematician Blaise Pascal was one of the first to create one of these machines, illustrated above, in 1642, which became known briefly as a pascaline.  In 1820, French inventor Charles Xavier Thomas de Colmar re-created something like a cross between Pascal’s machine and Gottfried Leibniz’s evolution of that machine, which he called the arithmometer.  

Blaise Pascal was born on this day, June 19, 1623-you can use your calculator, as I did, tocalculate that was 392 years ago.  Bonne anniversaire, Blaise!