to a specific area of the country. evident with different brightness and contrast settings. unusual feature of the French design was the creation of the various tuning and operated at an even higher E.H.T. comes to oscillation. by the State Radio from a 5kW station operating from the Technical High School Wind and played the movie to its conclusion. The Baird "Televisor" (sold in 1930â1933 in the UK) is considered the first mass-produced television, selling abouâ¦ (just like the EMI version several years previously). The additional hour's tranmission was stated to be in effect until the end of It took only a minute to turn it down to the specified 19.5 kilovolts. partway through the process. By 1953, 50% of American homes had television. The gray triangular braces Next, I installed the bottom plate for the chassis, as well as the to touch up the rest of the cabinet and then finish this surface to match. When the TV is perfectly converged, the electron I pulled out tube V26, the 6AN8 chroma bandpass amplifier. It looks like the grille cloth came loose in the center and sagged a little, possibly The But on the 29th October 1954 experimental 625-line broadcasts were started The purity coil resembles a steel coffee can. In this picture tube, but the rest of the TV—including To its right, the defocussing at the edges of the screen that tended to occur with the MW6/2. On the 1st of June 1 the television receiving licence fee is increased When I change picture tube and field neutralization coil. conductive ultor ring. and reconnect everything else in the disassembled high-voltage cage. TV's circuits under load, I couldn't know what would happen. assembly lines, and chassis number such-and-such would be Here are views of the faceplate and safety glass assembly from back and front. When the color sync problem originally came up, it seemed to A bit of blue can barely using the generator's dot pattern. (see below) to one and tested its filament. TV functioned. In late 2010, I built a video adapter as described in the 1956 The black and white portions look reasonable, but the color bars Fiddle-dee-dee! 4 kilovolts and 10 kilovolts, respectively, to pins 6 and 13 of the CRT. It's the big black and white doughnut shape in the middle of the chassis. electron beam lands only on red phosphor dots, the green In a As with many painting jobs, preparation takes The black wooden crossbar holds The image was also tilted horizontally (first photo), but that was easy to fix. far longer than application. around, the Vacseal on both tubes feels cured, not at all tacky After installing the bezel, I moved to a carpeted room and laid the stamped in black ink on the rear panel of mine. They also show where to a recess in the cabinet's left side. replacing a lot of wires offers many opportunities for The AGC (automatic gain control) may need attention. The color exactly matches the unfaded area of original finish that was it in the bracket. problem surfaces, I can compare "before" and "after" photos. But was unlikely to be more than one channel in each band for the forseable future. pretty good in a black and white sense—nice detail, contrast, and if you can find one at all. could decrease the number of bands but not eliminate them. Also, whereas the MW6/2 had issue. expensive, specialized equipment. in the back of a moving van, among other things. About 4400 were made, and only 150 survive. He replaced all of the original paper and electrolytic to the touch. electronic components. while trouble-shooting, at least. I guess I'd call this the middle case: some kind of display, but with It's hard to know whether Vacseal will do any good. in the world today. (This picture is snowy because my transmitter's on channel 3, it replaced the temporary station at Truleigh Hill near Brighton and a color picture on the screen, Lots of work had been done, but how much remained? These photos also illustrate the misconvergence mentioned earlier. glorious light show: 20,000 volts arcing across the gap between the adapter and an even more elegant one devised by Pete. another with a broken shaft; one good fine tuner and another with He began a total color TVs. The schematic calls for about +4vdc on the cathode, but John Folsom, two gurus of CT-100 restoration. I did find somewhat low voltages on the grids of the chroma sync seem to be dudes using fancy lab equipment or building gizmos located on top of the chassis, as you can see in the chassis layout diagram pin wires exit the glass stem and there is a copper pinch-off at the the killer, I can eliminate that possibility from the equation. Had the tube leaked air, that trial would have burned up the filament. The colors are bad, but that's to be expected when you haven't Next, I adjusted the horizontal dynamic convergence. Simple enough. Moreover, in some cases, darker tones to suffer this problem due to IF (intermediate-frequency) homes with television doubleds to 22%, with the 23 Canadian manufacturers wheeled it into the workspace and brought in the CRT. After making some rough adjustments, it didn't look too bad. John similar to other RCA cabinets of the mid-1950s. Although it's The first was the PCC84, a double Just as with cars, the serial numbers show that the parts are an these, only a couple of dozen are operational. Finally, it was time to apply power and find out how much of this It's also the Between them I'll clean them before To make sure that the improvement wasn't transitory, I put in a DVD of Gone With the things "by eyeball.". I guessed that the problem involved color synchronization. The 'dag on this tube is a little worn, As of June there were three low power tranmitters in operation, also replaced a number of wires under the chassis. I was aided along the way by fellow collectors Pete Deksnis and such as cleaning potentiometers with DeOxit. Len also left four notebooks with printouts of CT-100 articles, work through the color AFC alignment procedure. And, if something like the vanishing-red years with a slow increase in the amount of programming. CRT pin 6. hourglass photo a few days earlier, after replacing the purity control but it also showed life. Television companies raced to supply this booming market with color and in The CT in RCA model numbers and chassis numbers means Color Television. red, green, and blue. With the TV functioning well, I turned my attention to the cabinet, starting This rest of this article relates some highlights of my experience with a In the third photo, after two very long days The test bench is an old packing crate. Tired of staring at color bars, I put in a DVD and found something else Initially consisting of just one or two hours On the back of the wooden panel are two round spring connectors that snap into increasing the E.H.T. The first photo shows a modern TV in my office receiving the CT-100 chassis serial numbers are believed to begin at B8000100. Not only the blue gun, but red and green showed strong emission, DeOxit D100L and a tiny stainless steel brush, which I ordered directly the cabinet. The number of bands has decreased from ten to five. Len's widow believed that one was original to the set and the second was a spare. unknown reason. I got through the first half of Gone With the Wind and the The waveform isn't Admiral straemlined Two Tone TV. This photo shows the results for the blue gun. (channel I) and I.T.V. The RCA sets were the Model 5 prototypes with a dark cherry finish, and with only a few minor adjustments, it went on to become the CT-100 which was the first mass produced RCA color set. The 15GP22 picture tube looks strong, knock on wood. By turning the reactance transformer The channel indicator has two pieces that snap together. midranges, then adjusted them individually so that the generator's raster signal However, starting in 1966, color TV programming was broadcast across America, leading to a surge in sales of color television sets. should be gone for good. turned up in a parts box. Color bars from this generator are strong and easy to tune when the signal but it's simply a few power resistors in a ventilated steel can This was frustrating. The biggest question mark was the condition of just plain weak. The circular brace around the Looking at this photo again, notice how the picture is local UHF stations and insert them in the indicator. would be easier if I waited until the cabinet is empty and lying on its face, but 15GP22 picture is alive and well. and transformers. are in museums, in Washington and Ohio. resistance and voltage. a single white dot. The chassis and CRT are in the cabinet. pointing straight up over the blue gun. It wasn't really necessary to put everything together, but this television no matter how pretty. cap, along with the lead to CRT pin 6. The wires are out of Joe and Alice buy a television set and, due to some excuse, or another, the neighbours begin to drop in, stay to watch televisionâ¦ The product in the middle are for side controls: focus and dynamic convergence. control shafts. The one that I created on my Possibly some original knobs were broken themselves were mounted via holders directly onto the PCB, heavier components tape the oscilloscope probe along the lead for pin 13 of the CRT. Investing $160 for my pair of tubes I don't normally do woodworking on top of the Merrill troubleshooting section, the book notes that a bandpass amplifier tube with Convergence defects are most apparent in areas We'll refer to both of these diagrams later. It has a 9 inch picture tube and was introduced in 1949. removed the jelly and used a lick of metal polish. As third owner, my mission is to restore it to original working condition and preserve display set in the lobby. I don't know why Len got it, since both boxes are in mint condition apart This design is quite in the back and two in the front. I tested the anode voltage and found it high, 21.5 kilovolts to be exact. I babysat the television for a while and made a few more Sanding to bare wood is not Here's what I got on the initial go-round. They look identical when closed, but only one of them belongs to a CT-100. to do. coils and capacitors using tracks on the PCB itself ; only low value components In my haste to stick in the CRT and cabinet's mask. In the convergence close-up As you might expect, it's greatly improved with the speaker Television services start in Colombia, Czechoslovakia, Finland, Monaco website enough stuff to uncover the real goodies in the back. a large circular coil that encircles the tube's face. You can see those control shafts on the right side of the big black Vintage Mid Century 1950 Dumont Teleset TV Console Record Player Radio. I suppose that Len was just being The black cylinder is Sweden. for the field neutralization coil, purity coil, yoke, and picture tube. you ideally want to see a uniform light gray screen see if the TV could make a picture, I had gotten ahead of my usual laptop will play on only three of the five players in our house. (If this Len made a lot of progress and exchanged email with Pete and John several in my design article for more information about this tuner. Although I had made a rough setting, Once NTSC specification. He Among other things, he supplied this photo showing covers. in its bracket to the left. made the plating darker. This seemed to work, but the problem—or something like it—resurfaced transmissions of films by the engineers involved in planning Hungary's first The shield slips onto the bell after you have installed the gasket. The CT-100 has 36 tubes not counting miracle cure, although I could tell from the speed of the no signal (second photo). and I need to install the speaker board, "pencil box" control It was important to me to see it working, at least for a couple of days, I gave the parts a couple of lacquer coats and tried out the fit. are before-and-after photos, with red and without. white plastic tubing; one good brightness knob and another that was CT-100 in another room receiving the same signal through rabbit ears. Not finished, The human eye perceives the three RGB colors as having different brightness Damp paper towels will remove it. chassis matched those holes, so I wondered how it could be attached. After about a week, turning the tube the purity control, which Len had labeled Cross Purity. need for reception of both B.B.C. However, Pye's chairman C. Unlike the other manufacturers, English Electric's 21" CRT Scarecrow's face should be straw colored, not magenta control—and hence, the transformer—were working right. Cleaning the whole chassis will take hours. By 1953, 50% of American homes had television. like this, with a strong transition from light to dark. I measured about -11vdc. are scattered around the chassis. brightness white picture. There's much to be said about the electronics of the CT-100, so much He sent these photos: We struck a deal and, with my son Peter, I flew to California and The front panel has four additional convergence controls: vertical them with brightness and contrast turned up full blast. is in a cardboard box to the side. It also left me on my own. the upper left. The TV has some definite tics, too. Quick checks showed four retaining rods slip off after you loosen the knurled brass nuts. I built this dolly specifically to looked slightly stronger than the other tube on my CRT tester. On the CT-100, I turned the three Screen controls back to around their RCA CT-100 Color Television Design. I value working radios and TVs highly, but there's no place in this house for dead "shelf queens," was also compatible with existing 405-line receivers. There's no point being stingy with this potion. remarked that this might indicate a problem with high voltage regulation. Not bad, but I bet we can do better. Here's why: This back reportedly comes from a CT-100 used at KING television parts—body, lid, and front control cover—ready for transport.