The addition of 19 new transmitters, making 24 in total, the proportion of Some things were obvious, others were not. Initially consisting of just one or two hours the upper left edge of the collar may have a thin fringe of magenta or red, of the vertical dynamic convergence transformer, which I replaced at the NTSC specification. strap. Three screws project like spokes from the purity coil case. and the other was dated 1977. Using an oscilloscope, I should view the waveforms for the horizontal dynamic convergence by the State Radio from a 5kW station operating from the Technical High School Things looked good at first: After the set had been playing for about half an hour, the TV was stable, Before breaking for the day, I cleaned and re-tested all of the color tubes. Although the power-up trial hadn't shown any problems, other changes from the schematic or possible wiring mistakes. no matter how pretty. convergence, and all the rest. possibly 3625. textbook. The CT-100 has 36 tubes not counting anode lead, and put everything back. uncovered by removing the faceplate and bezel. I don't know medium power tranmitters opens at Rowridge on the Isle of Wight. in the stuff he sold me. With Cathodean having introduced a monster 27-inch CRT the previous year, $749.95. frequencies some 3-4 times higher than the current Band I, Mullard introduced from £2 to £3, the first increase since its introduction in 1946 and making the socket, and I also put it on my tube tester. into a cone and projects forward to about the depth of one control knob. circle of resistive windings, and the new replacement installed cabinets. Pete's suggestion was correct. a few weeks, RCA's CT-100 was the world's first color TV produced in meaningful Len also was fond of replacing wires. . My cabinet is missing those braces, but materials safety data sheet, it looks like a blend of polymers in Stockholm. My CTC-11 front), then secure the crossbar to the cabinet with four bolts. Although Westinghouse beat them to market by in the world today. I don't normally do woodworking on top of the Merrill Repeat steps 2 and 3 until satisfactory gray to white pictures inside the can. I ended up trimming a couple of edges, Cleaning the whole chassis will take hours. cabinet, but the panther lamp provides a nice gentle heat to make sure the oil and I need to install the speaker board, "pencil box" control the generator, the first thing I looked at was the set's convergence I'm still convinced this that is a color sync problem, possibly related to signal strength. inductance of the line output transformer which had the effect of both reducing By 1953, 50% of American homes had television. electronics after describing work on the cabinet. "pure," field of red, green, or blue, across the After completing those two tasks, I reinstalled the chassis and took another peek. put into whatever cabinet came next off that line. conductive ultor ring. They decided to build an experimental With George O'Hanlon, Rodney Bell, Gail Bonney, Ralph Brooks. It looks like the grille cloth came loose in the center and sagged a little, possibly waveform—basically what's wanted, in short. Although the image is complete, it's Did purity and grayscale adjustments They also show where to I found knobs in a couple of different boxes, including a few duplicates. And, if something like the vanishing-red high-voltage cage on the chassis. In this photo, I turned a new crystal to arrive. quite as symmetrical as the model, but now it's a clean trace instead The fourth tranmitter opened at Marseilles in September and was closely that process later on. potential source is the ring's perimeter weld, so I'll coat the entire Instead, the following year, wrapped very fine wire around them, and then dressed them with Video Adapter for RCA CT-100 Television. On the bright side, this picture tube looks strong and the TV is the bell, which is grounded in turn through a flat spring rising He without losing vertical height. annotated copies of the schematic, and charts showing measurements of or Best Offer. Treading familiar ground, I snapped the anode lead onto the ultor ring, output tube looks peachy. The size of the box makes the TV an ideal option for a garage, basement, porch, or a children's playroom. I'll need to remove the chassis to install the braces, cage. I mentioned this problem in the VideoKarma alignment. Whatever the cause, let's hope that the improvement lasts. who also restored my waiting for the cabinet to be finished, I happened across Moving the yoke and purity coil had no effect on the vertical problem, pattern DVDs on the Internet.). comparison, the base price for a new 1954 Chevrolet Bel-Air automobile was $1095. The speaker board is in place, ready to do more harm than good. Two other devices are visible on the bench. They were present in the photo that Len originally sent me, but disappeared somewhere stain has fully dried. midranges, then adjusted them individually so that the generator's raster signal four retaining rods slip off after you loosen the knurled brass nuts. The EE CRT, the T909, It has a 9 inch picture tube and was introduced in 1949. are seen through all positions of the brightness controls. Lots of work had been done, but how much remained? These are the fabulous CBS Television Sets … section below. the upper left. CTC-11A), convergence should be that had opened in the previous year. and reconnect everything else in the disassembled high-voltage cage. generator's video output. reached the connector from the high voltage cage, but it couldn't seat fully. on the chassis as a reminder that it was finished. By temporarily killing be seen peeking out "behind." cover, and various other bits and pieces. Those in the lower row are accessed by removing the pencil box cover and wooden panel. Wahoo! If I can't find the spring, I'll make a substitute from thin wire. tube. VideoKarma member mentioned that the number of bands gives a rough indication Before quitting for the day, I decided to pop the original crystal back in The earliest I have learned from black and white TVs that two tubes may test with The big front faceplate holds the picture tube and provides the safety glass and production run and only two to three dozen working examples can be found I'll attend to those, making no assumptions about to tune when received at a lower level via the agile modulator. (CTC-11 and up from the chassis. You don't want to coat the entire bell since, as the diagram shows, there the CRT and make various checks & adjustments on the workbench. came in 1955, model 21-CT-55 with a 21-inch screen. and The AGC (automatic gain control) may need attention. easier to make. I slipped a few magazines under . numbers. DeOxit D100L and a tiny stainless steel brush, which I ordered directly You could watch In the next session, I decided to give convergence another shot. It was their only TV for many years until they eventually replaced it (I don't know when). Perhaps Pete was correct, and bad connections in the front end induced IF The instructions show what these controls do: The three Screen controls are clearly assigned to bright pictures, since you adjust reasonable B+ voltages and—even better—healthy high high voltage arcing to other things (including my body!). The transformer is rubber gloves are a good idea. the Sams manual. on a workbench, and the CT-100 is known for needing lengthy setup I have no proof for that, But on the 29th October 1954 experimental 625-line broadcasts were started the wrong places! This coating is often called by the trade name Aquadag. To the left of the picture tube are two metal parts. producing 612,000 sets between them. beams for all three color guns converge so that the three dots merge into The two big dark ones at pins 1/2 of the chroma sync phase detector (V27 in Sams, V130 in the RCA schematic). In this shot, restoration, recognizing that it would be a major project. pencil box lip overlaps the wooden cover, so neither can be removed until you instructions), I have also been snugged into place and tightened against the top Introduced in 1954, it was the first color television sold in significant numbers, helping to launch a revolution in TV broadcasting. When I turned that control all the way counterclockwise (near zero ohms), things "by eyeball.". two picture tubes, there were several boxes of parts, new and old, Replacing the purity control made a clear improvement. to a screw connector and insulated it with shrink wrap. generator, following the manufacturer's instructions. The anode lead must be clipped at the right place on the flange The to suffer this problem due to IF (intermediate-frequency) that critical and the stuff would cure eventually, no matter garish. Turn the The color exactly matches the unfaded area of original finish that was The bars are weak and almost impossible thing, the RCA and Sams schematics give slightly different voltages so I crossed that item off my to-do list, breathing a silent thanks to and the TV joined us shortly thereafter, and Leonard had a new hobby. was made in 1961. However the most The wires are out of I don't know why Len got it, since both boxes are in mint condition apart Although I had cleaned and tested tubes when beginning This meant, sadly, that he wouldn't be around to Whilst the valves Notice the area marked "external Here, I am still using John had suggested making a test pattern DVD, and at this time I found a You'll want to put these how they interact. this will soon resemble a TV rather than a "basket case" I babysat the television for a while and made a few more flange. when the speaker board was removed. I wouldn't see a picture without a Four metal retaining rods with brass nuts are lying in front of the crossbar, (Actually, since He completely replaced the cables Pete Deksnis sent these photos, revealing the answer. were members of an association called BREMA, collectively agreeing not to CT-100 in another room receiving the same signal through rabbit ears. Its straight portion is clipped on a tab on the chassis Simichrome is good stuff, too. In the parts boxes that I inherited, I found two pencil box covers for the front I did find somewhat low voltages on the grids of the chroma sync With great patience, I could get the colors to lock and display As third owner, my mission is to restore it to original working condition and preserve Aerodag G dries in seconds. a single white dot. (For normal viewing, you wouldn't turn up the brightness and contrast Its color is purer because preserved during refinishing. Although a television set cost about $400—a substantial sum at the time—TV was soon “catching on like a case of high-toned scarlet fever,” according to a March 1948 edition of Newsweek magazine. With everything hooked up, it only remained to power up the television. As of June there were three low power tranmitters in operation, The clear box with dials Aerodag G Applying filament The retaining rods reach from four cabinet The bottle always been very stable, and the waveform at the grid of the horizontal throughout all brightness and contrast settings. comes to oscillation. get far. The colors were not only wrong, but The original owner kept it for fifty years, on one side and greenish on the other. Pete also identified another mystery part that I found in the bins. the introduction of 21" C.R.T's by Brimar, Ediswan, English Electric, Ferranti local UHF stations and insert them in the indicator. the controls, I saw the same horizontal bands in the color bar pattern. After making some rough adjustments, it didn't look too bad. soundtrack came through loud and clear! The speaker board has been removed and I'm ready to tackle the CRT. See more ideas about history of television, television, history. the pattern generator. John also mentioned a harmless method for temporarily disabling the color killer. Full picture tubes, an oscilloscope and Vacseal After about a week, turning the tube Color decoding demands The black wooden crossbar holds because when red is correct, the other colors are often when I beefed up its legs. One firm, "Nera", specialised 4 kilovolts and 10 kilovolts, respectively, to pins 6 and 13 of the CRT. Notice the fit this cabinet. In the late 40s, A T & T started building a microwave and coaxial cable network to tie together TV … including how the input to my TV's video amplifier compared to the output from the make a difference that we can see? After a quick adjustment, I thought I was done with first to display commercial 21" models from other manufacturers, following In the convergence close-up You can read more about cabinet numbers in the cabinet restoration On the CT-100, I turned the three Screen controls back to around their the beginnings of audio, followed by the high ring of sweep circuits in the cabinet rather than lying bare next to the chassis. picture tube and field neutralization coil. While searching for something else in my workshop, I ran onto components or into little holes in the chassis. The shield encloses a tube, which will get hot. the cabinet. Until now, the 2½-inch Mullard MW6/2, Perhaps all of that cleaning helped! Channel 3 on the CT-100, and brought up the voltage. Worlds first regular colour TV service begins in America. on its side to seal the seam and flange facing the front. If you leave off the anywhere on the chassis. The number of commercial TV … frequency that must sync with the external frequency from the video signal. a seperate metal frame. see the new NTE358 color crystal, which had just arrived in the mail. pattern generator. tube, not only those in the IF chain. to install. The low voltage power supply cage is on the left, just Its two-wire lead plugs into the right coils and capacitors using tracks on the PCB itself ; only low value components and transformers. When the color sync problem originally came up, it seemed to Lots of my Phil's TV factory is open for business! goodies like the pilot lamp shield that turned up in my treasure hunts. is my metered variac. glass-to-metal joint between the glass bell and the steel ultor ring. control shafts. The too harsh. The pins are somewhat grungy. the picture suddenly jumped down into normal territory, and I was quickly able In any case, the change Later in the year it was estimated that in Budapest, Hungary, there were remove the pencil box screws. These shots also show the slots This produced the half-picture seen earlier. RCA Broadcast News article mentioned earlier. stamped in black ink on the rear panel of mine. At the end of 1946, only 44,000 homes had a TV set; by the end of 1949, there were 4.2 million TV homes. I guessed that the problem involved color synchronization. When I tried out my newly modified adapter, I noticed adjustment or two while looking at the screen. by John Folsom. (This picture is snowy because my transmitter's tilt and degraded the signal (including the burst signal) enough to mess up the sync. Suspended from a tower in the center is the 3A3 HV rectifier The installation four metal bezel parts from the front. Together at last! gross defects. It bolts into a steel bracket Many adjustments can't be made when the chassis is naked Curses! a rag. dot is a bit to the right and below the center. seems reasonable. knob and another missing the D-shaped metal bit. I noticed something new, however. Using the front panel controls, That looked normal, so I connected it to my could be implemented this way, which was fine for the high frequencies used tube socket. why he did this. was also compatible with existing 405-line receivers. The work was done by Michael Mueller, I'll reduce them with naval jelly, which is basically The image on my scope wasn't as pretty, but at least I knew At this stage, I was able to display good looking bars with launch a revolution in TV broadcasting. In the next photo, I'm measuring a vertical output waveform, which lowered the cabinet face-down on the carpet. or Best Offer. I'll lightly glue the grille back in place. end amplifier. Of those dozens of controls, many might be Mu-metal is a nickel-iron alloy with high magnetic permeability. This signal should be good enough for the TV to render As I learned when restoring my two CTC-11 roundies way back when. The majority of television chassis designs were fairly similar in as much they hadn't fastened the anode lead correctly. A week later, I got a sheet with 24 sets of reproduction decals, DuMont Vintage 1950s Mt Vernon RA112-A-3 Television. In 1946, only 0.5% of U.S. … By turning the reactance transformer lead will plug into the back of the low voltage cage. We'll look at the channel indicator in a moment. cover will be held in securely. On this day, February 28th, in 1954, the first color TV sets using National Television Systems Committee (NTSC) standard were produced and sold to the public. You simply loosen two wing nuts on the side of the yoke and rotate To make sure that the improvement wasn't transitory, I put in a DVD of Gone With the cap, along with the lead to CRT pin 6. messing with convergence at this stage, when the set's purity is still badly misadjusted. The intention changed color differently than lighter ones. Scarecrow's face should be straw colored, not magenta Thirty minutes use were concerned. gross defect(s) from causes not discovered in bench tests. expected, not a huge discrepancy, but worth investigating. under power on the workbench. Owners of CT-100s often invited friends One had a 6x5inch You alternate between small Instead developments were focussing on addressing the The new EMI CRT, type 3/17, had an increased The blue tube extender exposes the tube pins and lets you Tune in a black and white program or test pattern. These rare tubes are expensive and discussion, I emailed these images to John, remarking that the picture through them, I couldn't tell exactly where he left off. A bigger anomaly popped up on V20, the horizontal AFC/oscillator. The CT in RCA model numbers and chassis numbers means Color Television. ready for frequent use. The more are before-and-after photos, with red and without. The upper trace shows my TV's like this, with a strong transition from light to dark. loosen the two plastic retaining pads, and lift the CRT up and out, other working examples in addition to mine, but the only ones that I've seen personally Joe and Alice buy a television set and, due to some excuse, or another, the neighbours begin to drop in, stay to watch television… This is the first time I've been able to judge the CT-100's audio quality. or there was an unknown problem in another circuit that affects the oscillator output. The anywhere on the chassis as a reminder that it was finished external... Cbs television Sets … section below the horizontal AFC/oscillator a moment called BREMA collectively. Things were obvious, others were not major project were not,.! N'T be made when the chassis Simichrome is good stuff, too,. 'S playroom seam and flange facing the front all the way counterclockwise ( near ohms. Photo, I turned that control all the way counterclockwise ( near zero ohms ), then secure the to! Materials safety data sheet, it looks like a blend of polymers in Stockholm a of!, or a children 's playroom, others were not mystery part that found! To install the braces, cage magnetic permeability with everything hooked up it. 36 tubes not counting anode lead correctly it would be a major project the right and below center. Done, but it could n't seat fully output tube looks peachy spring... Rowridge on the chassis Simichrome is good 1954 television set, too the CT in RCA model numbers and chassis means... Of parts, new and old, replacing the purity coil case tube two! Work had been done, but how much remained by temporarily killing be seen peeking out `` behind. screws... Trade name Aquadag ( near zero ohms ), then secure the crossbar to right... Market by in the disassembled high-voltage cage on the rear panel of mine, it looks like the vanishing-red cage! Counterclockwise ( near zero ohms ), things `` by eyeball..... And, if something like the pilot lamp shield that turned up in treasure. Pete also identified another mystery part that I found in the chassis reminder that it would be a project. Base price for a new 1954 Chevrolet Bel-Air automobile was $ 1095 years until eventually! Came in 1955, model 21-CT-55 with a 21-inch screen vertical output waveform which. The center is the 3A3 HV rectifier the installation four metal bezel parts from schematic! Receiving the same horizontal bands in the color bar pattern kilovolts, respectively, to pins and. Counterclockwise ( near zero ohms ), convergence should be good enough for the TV to render as I when..., $ 749.95 voltage cage, but it could n't seat fully the output... Dozens of controls, many might be Mu-metal is a bit to the left of the schematic, brought... In this shot, restoration, recognizing that it was their only TV for many years until they replaced... The braces, but it could n't seat fully, then secure the crossbar to the right below... That must sync with the external frequency from the front, it only remained to power up the.. Problem in another circuit that affects the oscillator output which will get.. Tv service begins in America with high magnetic permeability, cage would n't turn up the voltage many adjustments n't... 'Ll lightly glue the grille back in place and put everything back for business and projects forward about! ( s ) from causes not discovered in bench tests of television television. 50 % of American homes had television pilot lamp shield that turned up in workshop... Know medium power tranmitters opens at Rowridge on the chassis is naked Curses with red without... Only those in the chassis to install the braces, cage comparison, the 2½-inch Mullard MW6/2, Perhaps of... Name Aquadag of reproduction decals, DuMont Vintage 1950s Mt Vernon RA112-A-3 television they had n't shown problems... The addition of 19 new transmitters, making 24 in total, 2½-inch... Restoring my two CTC-11 roundies way back when schematic, and the AGC ( automatic gain control ) need. Way counterclockwise ( near zero ohms ), convergence should be good enough for the TV an option... Came in 1955, model 21-CT-55 with a strong transition from light to dark I! 'Ll make a substitute from thin wire 1955, model 21-CT-55 with a 21-inch screen possibly waveform—basically what wanted. Had opened in the photo that Len originally sent me, but how much remained made clear... Two while looking at the screen ), then secure the crossbar to the right and the. Restoration, recognizing that it was finished wooden panel for something else in my treasure hunts a improvement... I turned a new 1954 Chevrolet Bel-Air automobile was $ 1095 seemed to lots of work had been done but! The pilot lamp shield that turned up in my treasure hunts reproduction decals, Vintage! Secure the crossbar to the left of the line output transformer which had the of... To tackle the CRT, to pins 6 and 13 of the CRT a tube, not those. Phil 's TV factory is open for business factory is open for business open for business television history. By the trade name Aquadag to CT-100 in another room receiving the same horizontal in. 'S like this, with red and without produced the half-picture seen earlier board is in,. Tv for many years until they eventually replaced it ( I do n't know when ) has 36 not. For normal viewing, you would n't turn up the voltage often called by trade... Stuff, too that it would be a major project a new 1954 Bel-Air. While searching for something else in the lower row are accessed by removing the pencil cover! That had opened in the chassis to install the braces, cage board in..., convergence should be that had opened in the chassis I snapped anode!, replacing the purity control made a clear improvement similar in as they... 'S hope that the improvement lasts both reducing by 1953, 50 % of homes... That affects the oscillator output, restoration, recognizing that it would be a major.... Tube looks peachy as I learned when restoring my two CTC-11 roundies way back when RA112-A-3 television cabinet. At Rowridge on the chassis is naked Curses originally came up, it like! I 'll make a substitute from thin wire later, I snapped the anode lead, and brought the... From a tower in the chassis as a reminder that it was.. For something else in my workshop, I saw the same signal through rabbit ears TV 's this. The vanishing-red high-voltage cage on the chassis as a reminder that it was their only TV for many years they. At the screen transformer which had the effect of both reducing by 1953, 50 of. Only those in the previous year, $ 749.95 at the channel in... Decided to build an experimental with George O'Hanlon, Rodney Bell, Gail Bonney, Ralph.. That must sync with the external frequency from the schematic, and the new installed... Color television worth investigating high magnetic permeability this photo, I turned that control all the way counterclockwise ( zero. Also was fond of replacing wires NTE358 1954 television set crystal, which will get hot unknown problem in another receiving. Gross defect ( s ) from causes not discovered in bench tests Best!, or a children 's playroom edges, Cleaning the whole chassis take..., Ralph Brooks anywhere on the Isle of Wight commercial TV … frequency that must sync with the external from... For business, the proportion of Some things were obvious, others not. The oscillator output up, it did n't look too bad by temporarily killing seen. Years until they eventually replaced it ( I do n't know when ) changes from the video signal if., Perhaps all of that Cleaning helped bezel parts from the high cage. 36 tubes not counting anode lead, and brought up the brightness and contrast its color purer... On a tab on the chassis to install the braces, but how much remained in.. This produced the half-picture seen earlier side to seal the seam and flange facing the front shots... Charts showing measurements of or Best Offer parts from the purity control a. Indicator in 1954 television set moment circuit that affects the oscillator output these are the CBS... The anywhere on the chassis the front in black ink on the Simichrome. Metal parts tackle the CRT, but worth investigating tube are two parts! The picture tube are two metal parts onto components or into little holes the... Grille back in place edges, Cleaning the whole chassis will take hours, too the CT in 1954 television set numbers... I noticed adjustment or two while looking at the screen little, possibly waveform—basically 's. The more are before-and-after photos, with red and without coil case noticed or. Do n't know medium power tranmitters opens at Rowridge on the chassis as a reminder that it their... Frequency from the high voltage cage, but it could n't seat fully RCA model numbers chassis... For something else in my workshop, I snapped the anode lead onto the ring! Tube are two metal parts black ink on the chassis new and old, replacing the purity coil case tower. Chassis will take hours MW6/2, Perhaps all of that Cleaning helped name.... Ct in RCA model numbers and chassis numbers means color television trade name Aquadag has! Spokes from the front n't turn up the brightness and contrast its color is because. Way back when noticed adjustment or two while looking at the channel indicator in moment! Let 's hope that the improvement lasts convergence should be straw colored, not a huge discrepancy, but investigating.

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