All About Magic Eye Tubes A magic eye tube is an electronic vacuum tube that provides visual indication, usually in the form of green light, on an area called the targetinside the tube. The target is partially illuminated with the exception of the shadow area, which varies in size and shape depending on the signal applied to the tube. Magic eye tube Magic eye tubes are miniature cathode ray tube, usually with a built in triode signal amplifier. It usually glows bright green, (occasionally yellow in some very old types, e.g., EM4) and the glowing ends grow to meet in the middle as the voltage on a control grid increases. It is used in a circuit that drives the grid with a voltage that changes with signal strength; as the tuning knob is turned, the gap in the eye becomes narrowest when a station is tuned in correctly. Tuning Eye If a superhetrodyne receiver is not tuned properly to a station, distortion may result due to side band cutting of the signal. Some sets use an electron ray (tuning magic eye) tube to aid in tuning the set exactly to the station. The eye tube gives a visual indication of when the receiver is properly tuned to the signal being received. The Magic Eye VU Indicator using vacuum tube Gadgetronicx This makes the magic eye tube a perfect choice to display a one dimensional V U characteristic of a given wave in real time. THE POWER SUPPLY CIRCUIT: The PSU circuit, basically employs a 555 timer to set a stable oscillation frequency for the MOSFET, which in turn uses the property of inductors, that whenever an abrupt change of current occurs, a voltage spike is induced on the output. FC's Fluorescent Magic Eye Tubes SolOrb The 6U5 6E5 tube is one of the most common magic eye tubes, it was frequently used as a signal strength indicator in 1940s and 1950s consumer radios. The 6U5 6E5 uses an antique 6 pin tube base and has a 6.3V filament. Magic Eye Tube Submitted by BayLab for the Instructables ... Magic Eye tubes are basically a CRT display inside a vacuum tube. As you can see in the diagram below, The top ring is coated in zinc sulfide, which lights up when hit with electrons. The vacuum tube underneath the display fires a stream of electrons towards the top of the tube. DIYcrap: Magic Eye Tube 6e5c Magic Eye Tubes were used as RF indicator tubes on radios from the 1930s until the end of the tube era and needle movement meters displaced them. Magic Eye Winker • The senseless circuit Published on Dec 19, 2011 Based on the same dimensions as the tube board from the Magic Eye VU Meter (50 mm diameter) this gadget does only one thing: "Winking". It is powered via USB* and all 6V... Magic eye circuits for 6E5 Google Groups Magic eye circuits for 6E5 Here are some hook up ideas: Magic eyes are pretty simple to play with, once you get use to them. As with all "small signal" triodes (the front end of this tube), a... "Eye" Tube Hints This tube has a high voltage drop and in addition, the rest of the radio circuit loads the voltage down. Connect a 100 ohm resistor, for protection, to one of the 80 tube plates. The other end of the resistor to the anode of a diode (1000piv). The cathode of the diode should go to the positive end of a 10 mfd 450 volt cap. Adding a Magic Eye to a Hallicrafters S 20R One of the wires to the magic eye tube carries B voltage, which runs over 250 volts in my S 20R. That kind of voltage can deliver a bad shock, so don't take any construction shortcuts that might create a shock risk. I used the smallest enclosure that would contain the eye tube and its circuitry. Solid State Replacement for 6U5 & 6E5 Magic Eye Tubes The circuit is based on a PIC16F684 microcontroller and a JFET input buffer. The JFET buffer provides a very high input impedance to match that of a vacuum tube, and in addition, it provides a means to measure the radio AVC voltage which can swing outside the range of the microcontroller power supply. EM84 87 MAGIC EYE VU METER Simple "test" magic eye vu meter circuit. Eye used was EM84 or EM87, i dont remember. Made this video some time ago, but didnt upload it to youtube. Supply voltage was about 250V. I have also used ... VU meter with EM84 tube – AntiMath The magic eye tubes are just small CRT derivations, usually they also have a triode built in, as an amplifier. I had two EM84 laying around for some time ( EM84 are cheap and easy to find, mostly on eBay ), and as I was planning to start an all tube stereo amplifier, it made perfect sense to use magic eye tubes as vu meters, although EM84 can hardly be called a magic eye, it is more a “magic stripe”. Antique Radio Forums • View topic magic eye weirdness ... A mode switch operated by the band select pushbutton connects the eye tube grid to the active circuit. A divider resistor in the line that feeds the rectified FM signal voltage to the eye tube may have opened up, causing essentially "on off" operation of the display tube. Magic Eyes – Valves or Tubes Museum of Technology Magic Eyes. Cyclops one Tube Radio Tuning Indicators at Wumpus’s Old Time Radios. (lists 143 types!) Replacing 6.3V Magic Eye with 12.6V “1629” Electron Ray Tuning Indicator Tube aka Tuning Eye (Circuit of operation) German Site of Magic Eye Roehren Peak Program Meter using Magic Eye Nixie and Magic Eye Tubes Philco ... The 6E1P 6BR5 EM80 Magic Eye and Other Indicator Tubes Some originals are noticed in particular: • 6AF6G: this indicator agree, much shorter than previous ones, however, request the assistance of an outer tube (6K7) to work in good conditions • 6AL7GT, also of short length, has two rectangular areas light end of the tube.Receptor for emission frequency modulated (FM) control its electrodes are connected to the output History of Tuning Indicators: meters, graphs, Magic Eye, LED History of Tuning Indicators: meters, graphs, Magic Eye, LED ... History of Tuning Indicators: meters, graphs, Magic Eye, LED . ... cylinder is surrounded by a fixed coil with a resistance of approximately 2940 ohms that is inserted in the plate circuit of the I.F. amplifier tube. This field generated by this coil acts in an unsymmetrical way ... Design of push pull amplifier using Vacuum tube Gadgetronicx The output stage is a very typical topology you can find all over the internet. It’s just a couple of EL84`s working in push pull configuration in a pentode mode. I`ve made it with a fourth tube which I haven’t included in the circuit. It`s a magic eye indicator tube to give a rough estimate on the output level. Magic Eye Tube for sale | eBay These indicators were actually vacuum tubes that were nicknamed 'magic eye tubes' or 'tuning eyes.' If rebuilding old radios is a favorite hobby, you can actually recreate this eye tube effect with an affordable magic eye tube kit you can find on eBay. How do tuning eyes work? The Magic Eye Tuning Indicator r type.org (a) Circuit symbol for the Magic Eye tuning indicator type 6U5G (b) The 6U5G in a working circuit. An early version of the 'Magic Eye' is given by the valve type 6U5G and, since this represents what is virtually the simplest type of device available using Magic Eye principles, we shall use it for an introductory example. Magic Eye Tube Vu Meter Schematic WordPress Magic Eye Tube Vu Meter Schematic >>>CLICK HERE<<< This is the complete schematic of the above circuit. The magic eye tubes are just small CRT derivations, usually they also have a triode built in, as an amplifier. it made perfect sense to use magic eye tubes as vu meters, although EM84. instructables . Schematic Diagrams: Joule Thief A one tube radio receiver using a magic ... Magic Eye Tubes After assembling my prototype circuit, the magic eye tube ran successfully for eight hours drawing about 190 milliamps. Above is the schematic for my circuit, which I hope will open the door for many other creative opportunities for use of the magic eye tube. May 2008 Radio Electronics Projects Bob’s Electron Bunker Other Projects: • A very simple DDS controller • 455 kHz IF alignment signal generator • Switch Mode B Power Supply • Battery Current Sensor for the above B Supply • Add a filament winding to a transformer • Magic Eye Tube Solid State Replacement • Low Budget Surface Mount Parts Installation Magic Eye Stuff | Threeneuron's Pile o'Poo Here is a project I made using this tube family. The Magic Eye Winker:(Click of photo to view video) Here is the schematic for the winker above (Click on drawing to enlarge): This circuit can be used with a wide variety of magic eye tubes. There are a couple of caveats. The eye type needs to have an internal triode. The ones listed on the table do. EveryCircuit EM84 Magic Eye Indicator I wanted to share my results with the EM84 magic eye indicator tube. I made a VU Meter with it to show the signal strength of my Vacuum tube amplifier. By the way if someone has an interest in these things, and has a few tubes in the junkbox i designed a pretty reasonable class A vacuum tube amplifier with very common tubes, and I'm willing to ... Magic eye tubes Groups.io Hi John, Magic Eye's aren't hard to drive. All you need is a 250V and a filament supply voltage. Most have a built in triode to provide enough gain for the image portion of the tube. Magic Eye 005.upp.so net.ne.jp This is solid state magic eye named "EZ 6E5SA". This solid state magic eye is my hand made, mounted on 35mm film case. This 6E5SA's circuit is here. This solid state magic eye is looks like "EZ 6E5D" ! This is new magic eye named "EZ 6E5SB", my hand made. It looks like true magic eye tube. Circuit is here. amplifier Preamp for Magic Eye VU meter Electrical ... The tube needs 22v to fully close, but 12v will be enough for me. I want to use my computer output with the VU meter. There are some diagrams and schematics on the internet, but i don't think they will work with design. Could you recommend a preamp circuit that will work for me. Magic Eye Tube Wavemeter SolOrb The EAM86 6GX8 tube is a fairly rare tube but it can usually be found on eBay. This circuit could be built with any of the more common magic eye tubes. Tubes such as the EM80 6BR5, the EM84 6FG6 and the EM87 6HU6 should work just as well with appropriate pin changes. See my list of Fluorescent Magic Eye Tubes for alternate tube ideas. The EAM86 ... GLOWBUGS INFO: Evergreen Exciter for the Special Night MAGIC EYE TRANSMITTER HOWTO It is easy to install 6E5 on the place of oscillator tube because socket's pinout of this amazing valve is nearly the same to pinout of common 6J5 and 6C5 triodes. So, you can replace these tubes with The Magic Eye without any soldering. But if you want to see The Legendary Green Glow, you have to apply some voltage to the Pin #6 (fluorescent screen). How the german tuning indicators works? Radiomuseum.org How the german tuning indicators works? ... This Signal control's the Triode and on the Working resistor on Anode circuit, performed by an Resistor from 100Kohm's to 1 Meg ohm, the Anode Voltage. ... Dear Hans, thank you for taking the time to explain eye tube operation.

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