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#1
06-17-2006, 01:01 AM
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Driving an old electrostatic CRT with modern electronics?
Yesterday I was given an orphan 7" round CRT. It came out of an old automotive scope.
I was thinking about building something around it. I assume this CRT has a long persistance green phosphor so a computer monitor would be a better idea than a TV. Maybe an old Mac SE in a case styled after a 1940s style TV. Is it possible to adapt a modern chassis to drive this CRT or would an old scope be a better starting point? Pictures of the CRT to follow, I'm not at my usual PC at the moment. 
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#2
06-17-2006, 02:10 AM
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Let us know your results, I'm surprised no AKer's mentioned experimening with pic tubes.
__________________
1977 Zenith Chromacolor II A Very Modern Zenith
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#3
06-17-2006, 01:50 PM
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I have an old true dual beam Philips scope tube, but i have given ut trying to get some kind of picture on it. I do not have suitable power supplies to do it, and the main problem is of course the 3kV 2nd anode voltage. I have also tried to test some old indicator/"magic eye" tubes, but again the only power supplies i have that may give suitable voltages are so powerful that a short circuit would be like a small explosion, and i would need rectifyers and probably some smoothing caps. If i understand right, there is one pin to "light" the beam and another one to control it? Does someone have a simple circuit to test a 6U5 indicator tube?
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#4
06-17-2006, 02:00 PM
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A 6U5, etc. tube does not need real high voltage...they are usually used at around 200-300 volt plate voltage in radios.
Here is a web page with more about the eye tube: http://antiqueradio.org/magiceye.htm Last edited by Chad Hauris; 06-17-2006 at 02:04 PM.
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#5
06-17-2006, 05:05 PM
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CRT's are fun to play with and experiment with..!!
I am not sure if i am allowed to post this,but it is from a previous post on pioneer speakers repairs..look at my thread below. http://audiokarma.org/forums/showthr...t=72637&page=2
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#7
06-19-2006, 05:02 AM
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I've seen some of those scope clocks on other web sites before. They're cool, especially the one built into the Admiral TV.
I'd like to do something different though. Another thought I had today... A vector based video game, perhaps based on a Vectrex (thougth they aren't exactly easy to find). Still I'm not in a hurry with this so I'm sure I'll come up with something eventually. I have noticed that there is no part number on the CRT so that might slow things down a bit. Do these CRTs have a standard pinout?
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