Vacuum Tube

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Vacuum Tube: How Does It Work? (Part 1)

Order: Reorder
Duration: 9:17
Updated: 13 Aug 2013
author: improvised440

Using a hydraulic music system of his own design as a model, Adnan Arduman tries to cover how a vacuum tube works. His objective is to make his speech compre...

wn.com/Vacuum Tube How Does It Work (Part 1)

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How It's Made Audio Vacuum Tubes SD 360p =KCK= x264

Order: Reorder
Duration: 5:02
Updated: 01 Sep 2014
author: MrDkahhan

Audio Vacuum Tubes are Intelligent Made Devices. Watch The Episode of How It's Made Only On my Channel. The Video is Up-scaled For Better Quality. For Reques...

wn.com/How It's Made Audio Vacuum Tubes Sd 360P Kck X264

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AT&T; Archives: A Modern Aladdin's Lamp, about vacuum tubes,1940

Order: Reorder
Duration: 21:32
Updated: 29 Apr 2014

See more from the AT&T; Archives at http://techchannel.att.com/archives There were two versions of this film made; this is the short version. Watch for footage of the ridiculously huge vacuum tubes that were used for radio transmission. From the original 1940 documentation: "With Western Electric Vacuum Tubes in the starring roles, this film tells the fascinating story of tube development from the first crude bulbs of Edison and De Forest to the powerful and efficient tubes in use today, and shows the prominent part they play in radio, long-distance telephony, public address systems, sound motion pictures and the phonograph. Animated sequences depicting a traffic cop halting an on-rush of electrons inside a tube and a troupe of monkeys tossing pebbles at a grid explain the three-element tube so clearly that a non-technical audience can understand how it operates. Scenes in the tube shop show the precision workmanship that goes into the making of broadcasting and telephone repeater tubes. The camera moves from one intricate operation to another while skilled craftsmen transform spools of wire and rods of glass into these magic lamps of today." Footage courtesy of AT&T; Archives and History Center, Warren, NJ

wn.com/At T Archives A Modern Aladdin's Lamp, About Vacuum Tubes,1940

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Electronics At Work - 1943 Vacuum Tube Educational Documentary - WDTVLIVE42

Order: Reorder
Duration: 21:10
Updated: 04 Sep 2014
author: wdtvlive42 - Archive Footage

The Westinghouse Electric Corporation gives an over view of the vacuum tube. The six basic functions of vacuum tubes are detailed, along with examples of how...

wn.com/Electronics At Work 1943 Vacuum Tube Educational Documentary Wdtvlive42

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How It's Made - vacuum tubes

Order: Reorder
Duration: 5:01
Updated: 01 Sep 2014
author: morrisonAV

For some reason, I LOVE the show "How It's Made" and this segment is a beautifully shot piece on how vacuum tubes are made. These tubes are being made in the...

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Vacuum Tube Tester (3) - Thermionic Emission, Amplifiers and Instruments

Order: Reorder
Duration: 24:44
Updated: 02 Apr 2015

Part 3 of the "Vacuum Tube Tester" - Series. This time I perform some experiments to demonstrate the Edison / Edison-Guthrie-Effect (aka. as "Thermionic Emission"), on which vacuum tubes are based. I also show some methods to re-purpose magnetic moving coil instruments.

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Making a type C triode vacuum tube.

Order: Reorder
Duration: 59:03
Updated: 04 Sep 2014
author: glasslinger

Captain H. Round of the British Marconi Co. designed the type C tube in about 1913. It is a triode that was meant for high gain high frequency use. No exampl...

wn.com/Making A Type C Triode Vacuum Tube.

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Creating X-rays with a standard vacuum tube

Order: Reorder
Duration: 5:17
Updated: 13 Aug 2013
author: Ben Krasnow

I forced an RCA 811A tube to produce some X-rays by operating the tube in cold-cathode mode at about 20KV and 150uA. The glass fluoresces nicely, but I didn'...

wn.com/Creating X Rays With A Standard Vacuum Tube

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How It's Made - McIntosh Tube Amp

Order: Reorder
Duration: 5:01
Updated: 04 Sep 2014
author: morrisonAV

Here's another episode from the great "How It's Made" show on Discovery. This time, they show some of the steps in building a McIntosh tube amp. In case you'...

wn.com/How It's Made Mcintosh Tube Amp

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Vacuum Tube Amplifier Theory

Order: Reorder
Duration: 29:47
Updated: 05 Sep 2014
author: Possum Living

How amplifiers work. Here is another video about calculating gain in transistorized amplifiers: http://youtu.be/_c_jhUla4Fg.

wn.com/Vacuum Tube Amplifier Theory

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making a miniature vacuum tube triode

Order: Reorder
Duration: 35:46
Updated: 25 Nov 2014

Here we try to make vacuum tubes very small. These will be 1/4 inch in diameter and about 1 inch long! A diode and a triode are made.

wn.com/Making A Miniature Vacuum Tube Triode

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Vacuum Tube - Sixty Symbols

Order: Reorder
Duration: 8:30
Updated: 14 Dec 2010

The vacuum tube, or thermionic valve, was a crucial breakthrough in electronics - one that is still used today. More physics at http://www.sixtysymbols.com/

wn.com/Vacuum Tube Sixty Symbols

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Vacuum Tube Radio Repair

Order: Reorder
Duration: 16:20
Updated: 15 Aug 2013
author: HackaweekTV

In this week's video I explain how a vacuum tube works and how I repaired the old vacuum tube shop radio! Here's a link to teh project page on Hack A Week: h...

wn.com/Vacuum Tube Radio Repair

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Spectacular Failure and Replacement of Vacuum Tube in Atwater Kent 55C AM Radio

Order: Reorder
Duration: 26:13
Updated: 16 Jan 2015

How to get the most out of a gassy rectifier tube.

wn.com/Spectacular Failure And Replacement Of Vacuum Tube In Atwater Kent 55C Am Radio

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Vacuum Tube Output Transformer Measurements Determining Turns & Impedance Ratio & Matching To Tubes

Order: Reorder
Duration: 28:22
Updated: 03 May 2014

I have been asked a lot of questions over the years about transformers and this is my attempt to answer the basics - transformer/magnetics design is an engineering field all in its own so there are no YT videos that will make transformers a simple subject - I hope this helps the vacuum tube audio amplifier builder. Here is another link that might help - http://www.ozvalveamps.org/optrans.htm

wn.com/Vacuum Tube Output Transformer Measurements Determining Turns Impedance Ratio Matching To Tubes

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How to Spot Super Rare 12AX7 Vacuum Tubes part I

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Duration: 5:22
Updated: 25 Aug 2014
author: audiotubes

This short video briefly touches on some of the most famous and sought after 12AX7 NOS vintage tubes. Featured are the very rare Mullard longplates, Amperex ...

wn.com/How To Spot Super Rare 12Ax7 Vacuum Tubes Part I

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Vacuum Tube Tester (2) - The Voltage Multiplier Cascade

Order: Reorder
Duration: 20:57
Updated: 23 Mar 2015

Part II of the Vacuum Tube Tester - Series. Teardown + Voltage Multiplier Cascade. To clarify why I used 2.4kV instead of 2.0 kV in my equations: The Bosh capacitors would all be able to handle 300 or 600 V. It's the "dish washer motor capacitors" that are the limiting factor. They only have a DC voltage rating of 500 V AC . I therefore will have to inform myself what that exactly means and what DC-voltages they are rated for. My estimation is that they can handle 600 V DC. Therefore I think that 2.4 kV (4*600 V) are still a realistic maximum output voltage. The potentials at the nodes in the lower row are then: 600V, 1200V, 1800V and 2400V. Should one of the dish washer motor capacitors fail, will I replace all of them by higher rated caps.

wn.com/Vacuum Tube Tester (2) The Voltage Multiplier Cascade

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Vacuum Tubes/Valves by Mullard ~Manufacture for Audio TV Radio

Order: Reorder
Duration: 25:27
Updated: 03 Sep 2014
author: Tubes Valves

A great look at how Mullard Thermionic valves (vacuum tubes) are made. Looks like this was made in the 1950's and shows some great footage of tubes/valves be...

wn.com/Vacuum Tubes Valves By Mullard ~Manufacture For Audio Tv Radio

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WESTINGHOUSE VACUUM TUBE ELECTRONICS AT WORK WWII Historic Film 71552

Order: Reorder
Duration: 20:42
Updated: 08 Apr 2015

Produced by Westinghouse during WWII, this film explains how electronic vacuum tubes work from the simple diode (single pole switch) to the complex Cathode Ray tube. As the film shows, tubes with grids can be used as electronic amplifiers, rectifiers, electronically controlled switches, oscillators, and for other purposes. Some of the innovations shown in the film include tubes used as rectifiers (for AC/DC conversion and production of metal such as aluminum), an early kind of tube based electrostatic air purifier called a Precipitron, tubes used in radio transmitters and radio telephones (as seen around the 00:08:10:00 mark), for remote control, analysis and testing, for television, X-rays and more. Manufacture of tin plate (00:11:32:00) is also shown, with tubes generating high frequency current to make the process possible. Dialetric heating is shown being used to laminate plywood and test plastic, and increasing the load carrying capacity of transmission lines. At 00:10:20:00, a recreation is shown of the first radio broadcast made at the Westinghouse Studios of the electon of Warren G. Harding. Electronic control of various systems in manufacturing is detailed starting around the 13 minute mark. These systems provided an enormous edge for American manufacturing during the war by increasing efficiency. Photo cells and tubes -- "electronic eyes" -- are shown operating relays, transforming light into current and transforming current into light. (An early TV tube appears at the 16 minute mark). Fluorescent tubes are also shown, and a discussion of sterile lamp rays is shown at about 18 minutes. And one of the great developments of the war -- radar -- is shown at the 18:30 mark. In electronics, vacuum tube, electron tube (in North America), tube, or valve (in British English) is a device that controls electric current through a vacuum in a sealed container. Vacuum tubes mostly rely on thermionic emission of electrons from a hot filament or a cathode heated by the filament. This type is called a thermionic tube or thermionic valve. A phototube, however, achieves electron emission through the photoelectric effect. Not all electron tubes contain vacuum: gas-filled tubes are devices that rely on the properties of a discharge through an ionized gas. The simplest vacuum tube, the diode, contains only an electron emitting cathode and an electron collecting plate. Current can only flow in one direction through the device between the two electrodes, as electrons emitted by the hot cathode travel through the tube and are collected by the anode. Adding control grids within the tube allows control of the current between the two electrodes. Invented in about 1910, vacuum tubes were a basic component for electronics throughout the first half of the twentieth century, which saw the diffusion of radio, television, radar, sound reinforcement, sound recording and reproduction, large telephone networks, analog and digital computers, and industrial process control. Although some applications had counterparts using earlier technologies such as the spark gap transmitter or mechanical computers, it was the invention of the vacuum tubes that made these technologies widespread and practical. In the forties the invention of semiconductor devices made it possible to produce solid-state devices, which are smaller, more efficient, more reliable, more durable, and cheaper than tubes. Hence, in the '50s and '60s, solid-state devices such as transistors gradually replaced tubes. The cathode-ray tube (CRT) remained the basis for televisions and video monitors until superseded in the 21st century. However there are still a few applications for which tubes are preferred to semiconductors; for example, the magnetron used in microwave ovens, and certain high frequency amplifiers. This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD and 2K. For more information visit http://www.PeriscopeFilm.com

wn.com/Westinghouse Vacuum Tube Electronics At Work Wwii Historic Film 71552

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Building a Vacuum Tube Tester (1) - Rohde & Schwarz Teardown !

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Duration: 13:00
Updated: 16 Mar 2015

Building a Vacuum Tube Tester. Teardown of a 1963 Rohde & Schwarz Frequency Meter.

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DIY SOLAR TUBES EVACUATED VACUUM TUBE SOLAR HOT WATER Boil water with the power of the SUN

Order: Reorder
Duration: 13:27
Updated: 21 Nov 2008

Boil water just by placing it in the sun. http://www.greenpowerscience.com/ This is a simple process to make your owns solar evacuated vacuum tubes from any bottle and a $2 vase from Walmart.

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Homemade super heterodyne vacuum tube radio with AVR (atmega328p) frequency counter

Order: Reorder
Duration: 4:20
Updated: 17 Jun 2014
author: puyansude

Homemade super heterodyne vacuum tube radio with AVR (atmega328p) frequency counter. The tubes are: 12BE6, 12BA6, 12BA6, 12AV6 and 12BY7. The frequency count...

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How To Make Electron Tubes - P&C; Electronics

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Duration: 15:00
Updated: 04 Sep 2014
author: amp P&C; Electronics

Hello, everyone. I have created a video, made of how to make a vacuum tube. I'd appreciate to your interested. In addition, some amplifiers that have been ...

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photo: UN / Kim Haughton

Pope Francis addresses the General Assembly during his visit to United Nations headquarters, 25 September, 2015.

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Who Will Forgive Pope Francis for Canonizing Genocide?

WorldNews.com

27 Sep 2015

Article by WN.Com Correspondent Dallas Darling. It may seem absurd but even Popes err. Such was the case when Pope Francis visited the United States and canonized Junipero Serra's "sacred mission" to forcibly convert and Christianize California Indians in the name of the Spanish Empire and Catholic Church ... Those who fought Serra's imperial faith were killed. Those who attempted to escape were captured, tortured and then murdered ... 85....

photo: NASA / Marshall Space Flight Center

Lunar eclipse taken by NASA's Marshall Space Flight Center. For the first time in more than 30 years, a supermoon in combination with a lunar eclipse will occur late on Sept. 27, 2015, in the U.S. and much of the world. A total lunar eclipse will mask the moon’s larger-than-life face.

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'Supermoon' set to coincide with lunar eclipse

BBC News

27 Sep 2015

Astronomers are gearing up to spot a rare phenomenon, as a lunar eclipse coincides with a so-called "supermoon". A supermoon occurs when the Moon is as close as it can be to Earth, meaning that it appears larger in the sky. The eclipse - expected to make the Moon appear red in colour - will be visible in North America, South America, West Africa and western Europe ... But Dr Massey added ... Please only send pictures you have taken yourself ... ....

photo: NASA / Greg Shirah

File - Mars true-color globe showing Terra Meridiani.

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Nasa to reveal major Mars finding, prompting water speculation

The Guardian

28 Sep 2015

US space agency has promised a solved mystery, and invited guest who discovered possible signs of water while a student. Nasa is to reveal a “major science finding” from its Mars exploration mission, giving rise to rumours that the US space agency has found traces of liquid water on the red planet ... While it is keeping its cards close to its chest, the agency has promised a “Mars mystery solved” ... He told the Boston Herald ... ....

photo: WN / Sayali Santosh Kadam

Audi car displayed at an auto expo-automobile.

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Volkswagen's Audi says 2.1 million cars are fitted with emission-cheating software

Business Insider

28 Sep 2015

In Germany alone, 577,000 vehicles were affected and 13,000 in the United States, an Audi spokesman said ... More from AFP . ... ....

photo: AP / Evan Vucci

Chinese President Xi Jinping applauds President Barack Obama after his welcoming remarks during an official state arrival ceremony for the Chinese president, Friday, Sept. 25, 2015, on the South Lawn of the White House in Washington.

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A Chinese Aircraft Carrier Docks in Syria to Support Russia and Iran

The Total Collapse

27 Sep 2015

As US President Barack Obama welcomed Chinese President Xi Jinping to the White House on Friday, Sept. 25, and spoke of the friendship between the two countries, the Chinese aircraft carrier Liaoning-CV-16 docked at the Syrian port of Tartus, accompanied by a guided missile cruiser. This is revealed exclusively by DEBKAfile....

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In Silicon Valley, do it yourself is the sutra of success

The Times of India

20 Sep 2015

The police excess violated a very basic American creed ... Its eco-system nurtures immigrant initiative and is also enriched by it ... And should they make a sortie to Fry's, a local electronic outlet, they'll even find a typical wellspring that nourishes the Valley's spirit — the store sells not just finished TV, computers, and other white goods, but also rows and rows of motherboards, chips, circuits, vacuum tubes and sundry peripherals ... ....

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Korean War veterans receive Korean Ambassador for Peace Medal (Scott Air Force Base)

Public Technologies

18 Sep 2015

(Source. Scott Air Force Base) Photos Lt Col Stephen Esposito, commander, 375th Communications Support Squadron, presents the Korean Ambassador for Peace Medal to John Dichard who is the youngest Mosquito at 78. He retired from the Air Force as a master sergeant with 20 years, four months and three days of service. (U.S. Air Force photo/Christine Spargur) ... (U.S ... 4 ... Moreover, they relied on fragile glass vacuum tubes that could easily break....

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DarkVoice OTL Tube Headphone Amplifier for $220 + $15 s&h;

CNET

16 Sep 2015

MassDrop offers the DarkVoice OTL Tube Headphone Amplifier, model no. 336SE, for $219.99 plus $14.99 for shipping. That's the lowest total price we could find by $85. This Output Transformer-less (OTL) amplifier features an anodized black metal case, 6N8P and 6N5P vacuum tube stage, gold-plated RCA connectors, 10Hz to 30kHz frequency response, and rated impedance output of 32 to 600 ohms. Deal ends September 21 ... ....

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‘The Whispering Star’ (‘Hiso Hiso Boshi’): TIFF Review

The Hollywood Reporter

12 Sep 2015

0. 0. 0. 0. 0. Email Print Comments. Toronto International Film Festival. The Bottom Line. Sono in space. Venue. Toronto International Film Festival (Contemporary World Cinema) Cast. Megumi Kagurazaka Director-screenwriter. Sion Sono.   ... Prolific Japanese auteur Sion Sono is having quite a busy year ... Only after some time do we realize she’s on a space shuttle operated by a HAL-like computer in the shape of an old vacuum tube radio ... Cast....

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Elon Musk says building the Hyperloop is 'really not that hard'

Business Insider

11 Sep 2015

SpaceX and Tesla Motors CEO says building the Hyperloop isn't really that hard. Billionaire visionary Elon Musk is known for taking on big, complicated projects ... The Hyperloop is Musk’s vision of a transportation system that can travel at nearly sonic speeds in a vacuum tube ... “It’s like a tube with an air hockey table, it’s just a low pressure tube, with a pod in it that runs on air bearings, on air skis ... Watch the full interview below ... ....

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Flamboyant Tesla Watch steampunkifies your wrist

CNET

29 Aug 2015

Calling all steampunk adventurers, pirates, scientists and Victorian ladies. Your outrageously large vacuum-tube-decorated wrist watch has arrived here. Gadgets ... by Amanda Kooser. @akooser ... You might notice the two vacuum tube-style LEDs protruding from the top of the watch ... If you're a stickler for historical accuracy, you might want to remember that vacuum tubes as we know them weren't invented until 1904 ... ....

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One university is now offering a Hyperloop design course

Business Insider

26 Aug 2015

Elon Musk’s Hyperloop dream has sparked the imaginations of entrepreneurs and engineers around the world. And now the futuristic mode of transportation is even beginning to shape college curricula ... The course, which began on Tuesday, requires students to design a passenger capsule for the transportation system that can travel at nearly sonic speeds in a vacuum tube ... Aero & Astro, Mechanical, and Industrial ... Copyright 2015 ... ....

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Armed robber chased off with vacuum tube

Sydney Morning Herald

25 Aug 2015

... food store after the shop assistant beat him with a vacuum cleaner tube....

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Elon Musk's Hyperloop Is Actually Sort Of Happening

IFL Science

21 Aug 2015

The Hyperloop is a concept for a transportation system whereby a capsule inside a near-vacuum tube can accelerate up to around 1,220 kilometers (760 miles) per hour, providing a rapid transport system for passengers. It’s estimated that a trip from Washington D.C. to New York City would take just 30 minutes. It sounds like the stuff of science fiction – and at the moment, it is ... HTT/JumpStartFund ... Inner-city lines are also on the agenda....

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U.S. Census Bureau Daily Feature for August 19

PR Newswire

19 Aug 2015

WASHINGTON, Aug. 19, 2015 /PRNewswire-USNewswire/ -- Following is the daily "Profile America" feature from the U.S. Census Bureau .. ON THE AIR. Profile America — Wednesday, August 19th. Two geniuses in the field of electronics whose inventions changed pastimes the world over were born in August ... He invented the three-element vacuum tube, a step toward creating radio ... Sources. ... Vacuum tube ... ....

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18.08.15 — Structural health monitoring: NDT-integrated aerostructures enter service (Structural Monitoring Systems plc)

Public Technologies

18 Aug 2015

The Boeing Co.'s (Chicago, IL, US) 737 narrowbody aircraft operated by Delta Air Lines (Atlanta, GA, US) have been outfitted with Comparative Vacuum Monitoring (CVM) sensors for crack detection (see "Structural health monitoring ... Vacuum tubes are then routed to a testing socket and attached using snap-clip connectors like ... Comparative Vacuum Monitoring (CVM)....

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‘Inside the Machine,’ by Megan Prelinger

San Francisco Chronicle

13 Aug 2015

In the excellent seventh-season “Mad Men” episode “The Monolith,” Sterling Cooper’s creative team loses its brainstorming/smoking/drinking lounge to make way for an enormous 1969 state-of-the-art office appliance ... [...] transistors had been made out of another material that was more expensive. The untrained eye sees a stylized image of a transistor superimposed perpendicularly over a vacuum tube, floating in what appears to be Wile E....

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Patriot Air and Missile Defense celebrates 50 years of innovation

Stockhouse

13 Aug 2015

Cold-war era vacuum tubes and monochrome screens have long since disappeared, replaced by state of the art technology. microchips smaller than a grain of salt and hi-res touch-screen monitors that would be the envy of any video-gaming enthusiast. Today's Patriot now uses three new missiles – the GEM-T, PAC-3 and PAC-3 MSE ......

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Vacuum Tube: How Does It Work? (Part 1)

How It's Made Audio Vacuum Tubes SD 360p =KCK= x264

AT&T; Archives: A Modern Aladdin's Lamp, about vacuum tubes,1940

Electronics At Work - 1943 Vacuum Tube Educational Documentary - WDTVLIVE42

How It's Made - vacuum tubes

Vacuum Tube Tester (3) - Thermionic Emission, Amplifiers and Instruments

Making a type C triode vacuum tube.

Creating X-rays with a standard vacuum tube

How It's Made - McIntosh Tube Amp

Vacuum Tube Amplifier Theory

making a miniature vacuum tube triode

Vacuum Tube - Sixty Symbols

Vacuum Tube Radio Repair

Spectacular Failure and Replacement of Vacuum Tube in Atwater Kent 55C AM Radio

Vacuum Tube: How Does It Work? (Part 1)

How It's Made Audio Vacuum Tubes SD 360p =KCK= x264

AT&T; Archives: A Modern Aladdin's Lamp, about vacuum tubes,1940

Electronics At Work - 1943 Vacuum Tube Educational Documentary - WDTVLIVE42

How It's Made - vacuum tubes

Vacuum Tube Tester (3) - Thermionic Emission, Amplifiers and Instruments

Making a type C triode vacuum tube.

Creating X-rays with a standard vacuum tube

How It's Made - McIntosh Tube Amp

Vacuum Tube Amplifier Theory

making a miniature vacuum tube triode

Vacuum Tube - Sixty Symbols

Vacuum Tube Radio Repair

Spectacular Failure and Replacement of Vacuum Tube in Atwater Kent 55C AM Radio

Vacuum Tube Output Transformer Measurements Determining Turns & Impedance Ratio & Matching To Tubes

How to Spot Super Rare 12AX7 Vacuum Tubes part I

Vacuum Tube Tester (2) - The Voltage Multiplier Cascade

Vacuum Tubes/Valves by Mullard ~Manufacture for Audio TV Radio

WESTINGHOUSE VACUUM TUBE ELECTRONICS AT WORK WWII Historic Film 71552

Building a Vacuum Tube Tester (1) - Rohde & Schwarz Teardown !

DIY SOLAR TUBES EVACUATED VACUUM TUBE SOLAR HOT WATER Boil water with the power of the SUN

Homemade super heterodyne vacuum tube radio with AVR (atmega328p) frequency counter

How To Make Electron Tubes - P&C; Electronics

Vacuum Tube: How Does It Work? (Part 1)

How It's Made Audio Vacuum Tubes SD 360p =KCK= x264

AT&T; Archives: A Modern Aladdin's Lamp, about vacuum tubes,1940

Electronics At Work - 1943 Vacuum Tube Educational Documentary - WDTVLIVE42

How It's Made - vacuum tubes

Vacuum Tube Tester (3) - Thermionic Emission, Amplifiers and Instruments

Making a type C triode vacuum tube.

Creating X-rays with a standard vacuum tube

How It's Made - McIntosh Tube Amp

Vacuum Tube Amplifier Theory

making a miniature vacuum tube triode

Vacuum Tube - Sixty Symbols

Vacuum Tube Radio Repair

Spectacular Failure and Replacement of Vacuum Tube in Atwater Kent 55C AM Radio