Love all them Radio Electronics and news. My father's only vice was a subscription to them in the 40s till about 65. Hundreds. All went in a fire in 2008. But still remember them books. Thank you sir.
Another great find and enjoyed this really am so great full to allowing me to share in your adventures and allowing me to enjoy the excitement million thanks
Always great to find publications specific to restoring old vintage TV's. Even better finding things like ads regarding stuff pertaining to repairmen or want to be repairmen then. I think if you got some of dental x ray film and put a paper clip on it and place it near the neck of the picture tube you can see the outline of the paper clip on the film if the emission is high enough. Then try it on the front of a picture without any safety glass on it using another piece of film. May see a very faint outline of the paper clip compared to the neck.
X-rays have a spectrum just like light. Part of what determines the "color" or wavelength of X-rays is the target material, light elements like aluminum tend to produce longwave "soft" X-rays. Other things like tungsten produce shorter more penetrating rays. Tungsten is commonly used because of the wavelength as well as the fact to generate powerful rays requires higher current and voltage both of which produce more heat in the target. The regulator circuit in a color TV reduced the effect of varying power line voltage and temperature change on the HV.
Wow. At 4:15.. I'd love for you to be so kind as to photocopy and post an image of that color gamut chart so we can all see where they (the industry)(and us too) were at that time.
I used to make HV Power Supplies. I made several levels of and types of anode supplies, from F-4 fighter display replacements for Japan to high brightness wide aspect daylight viewable displays used on the early steady-cams to Tri-Tube projectors used on the early 747s (think HV splitter). I made 180kV supplies (-90kV - 0 - +90kV) to excite an $800 X-Ray tube inside an oil filled lead lined steel box bigger than a suitcase that were the original supplies in the original airport X-Ray set-ups (now they are color and way more efficient). I made 50kV supplies that LANL used to X-Ray nukes. I can tell you how X-Rays are made on a color TV. An X-Ray is produced when an electron, usually in an electron stream, strikes a metal surface. The type of metal and angles of incidence and other factors are there but generally a high energy electron, which is the case with a 25+kV anode supply, striking the typically metal grid just behind the phosphors is where they get produced. Not a great amount and they got better at nulling it. But yes, sitting right in front of the TV meant a slightly better chance that an odd X-Ray would be emitted toward one's self. I doubt any significant amount from any of the tubes used in the TV circuitry. It's the main picture tube.
It is always nice to hear from someone with relevant experience. However I remember the color TV X-ray issue. The main problem was the HV shunt regulator, this was a power triode connected from the HV to ground. The tube conducted enough current to load down the HV to the correct value. The tube had a anode shaped like a hollow cylinder with one end closed. A beam of electrons would enter the cylinder at the open end, when X-rays were produced they could escape through the open end, with faced the base of the tube. There was a disc of metal inside the tube between the anode and the base but due to alignment problems some X-rays slipped by. With the horizontal chassis and shunt regulator mounting the X-rays would come out the bottom of the cabinet. So if it was a cabinet with short legs, under the TV wouldn't be a good place for a cat to sleep. After a time shunt tubes with better shielding solved the problem.
Thank you for another awesome publications review!...found Jack Darr’s Service Clinic to be a real find!!...enjoyed commentary on Techni-talk x-ray article!!!...ITI correspondence course…have you ever run across any of the radio/television kits that came with these kinds of courses?
Great document stuff ❤🥰
Love all them Radio Electronics and news. My father's only vice was a subscription to them in the 40s till about 65. Hundreds. All went in a fire in 2008. But still remember them books. Thank you sir.
Another great find and enjoyed this really am so great full to allowing me to share in your adventures and allowing me to enjoy the excitement million thanks
Always great to find publications specific to restoring old vintage TV's. Even better finding things like ads regarding stuff
pertaining to repairmen or want to be repairmen then. I think if you got some of dental x ray film and put a paper clip on it
and place it near the neck of the picture tube you can see the outline of the paper clip on the film if the emission is high enough. Then try it on the front of a picture without any safety glass on it using another piece of film. May see a very faint outline of the paper clip compared to the neck.
Loved it
X-rays have a spectrum just like light. Part of what determines the "color" or wavelength of X-rays is the target material, light elements like aluminum tend to produce longwave "soft" X-rays. Other things like tungsten produce shorter more penetrating rays. Tungsten is commonly used because of the wavelength as well as the fact to generate powerful rays requires higher current and voltage both of which produce more heat in the target.
The regulator circuit in a color TV reduced the effect of varying power line voltage and temperature change on the HV.
Wow. At 4:15.. I'd love for you to be so kind as to photocopy and post an image of that color gamut chart so we can all see where they (the industry)(and us too) were at that time.
I used to make HV Power Supplies. I made several levels of and types of anode supplies, from F-4 fighter display replacements for Japan to high brightness wide aspect daylight viewable displays used on the early steady-cams to Tri-Tube projectors used on the early 747s (think HV splitter). I made 180kV supplies (-90kV - 0 - +90kV) to excite an $800 X-Ray tube inside an oil filled lead lined steel box bigger than a suitcase that were the original supplies in the original airport X-Ray set-ups (now they are color and way more efficient). I made 50kV supplies that LANL used to X-Ray nukes. I can tell you how X-Rays are made on a color TV. An X-Ray is produced when an electron, usually in an electron stream, strikes a metal surface. The type of metal and angles of incidence and other factors are there but generally a high energy electron, which is the case with a 25+kV anode supply, striking the typically metal grid just behind the phosphors is where they get produced. Not a great amount and they got better at nulling it. But yes, sitting right in front of the TV meant a slightly better chance that an odd X-Ray would be emitted toward one's self. I doubt any significant amount from any of the tubes used in the TV circuitry. It's the main picture tube.
It is always nice to hear from someone with relevant experience. However I remember the color TV X-ray issue. The main problem was the HV shunt regulator, this was a power triode connected from the HV to ground. The tube conducted enough current to load down the HV to the correct value. The tube had a anode shaped like a hollow cylinder with one end closed. A beam of electrons would enter the cylinder at the open end, when X-rays were produced they could escape through the open end, with faced the base of the tube. There was a disc of metal inside the tube between the anode and the base but due to alignment problems some X-rays slipped by. With the horizontal chassis and shunt regulator mounting the X-rays would come out the bottom of the cabinet. So if it was a cabinet with short legs, under the TV wouldn't be a good place for a cat to sleep. After a time shunt tubes with better shielding solved the problem.
Thank you for another awesome publications review!...found Jack Darr’s Service Clinic to be a real find!!...enjoyed commentary on Techni-talk x-ray article!!!...ITI correspondence course…have you ever run across any of the radio/television kits that came with these kinds of courses?
No, none so far. I imagine there are not many left
Bob, have you ever worked on a AGA Tv, it is a swedish brand. I have one from year 1956
Nope. I've only worked on american TV brands.