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Du Mont 3 DU MONT TYPE 180 Twenty-two Tube, AC, Superheterodyne, Television Receiver GENERAL FEATURES No expense has been spared in the production of these A separate high fidelity section brings superb receivers and every up-to-date television and radio reproduction of the sound channel which is associated development has been incorporated. These receivers are with the picture. A single control tunes both the sight and classed as "Electrostatic and Direct Vision." Electro-stati
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Du Mont 4 CIRCUIT ARRANGEMENT A simple straight line layout is used in these the receiver is installed under the operating conditions receivers that should prove extremely helpful to the imposed by the .earth’s magnetic field. and the power serviceman. Viewed from the front, the video receiver is supply line voltages. Once properly set these controls do on the left side of the chassis and the sound receiver is on not need adjustment and since they. were not provided for the right
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Du Mont 7 INSTALLATION OF RECEIVER Antenna Installation Location of the Antenna In the installation of television receivers the proper Whenever possible the Dipole should be erected so antenna is a necessity. Successful installations will result that it is in line of sight with the transmitter. This does not from attention to details, while slipshod and careless work mean that no signals can be secured where a direct view will bring only poor customer satisfaction and repeat of t
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Du Mont 9 Directional Effects 4. Marked INTENSITY The intensity or brightness of the picture is controlled by In the simple Dipole, directional effects are not very this knob. It should be adjusted in conjunction with pronounced, but it does have a rather sharp no-signal Control No. 1 to get the best picture. Note: it is a good radius and it is possible in some instances to materially plan to retard (turn to the left) this control when starting reduce interference by placing the offe
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Du Mont 11 4. Astigmatic Positioning Control If no picture can be secured but modulation (dark and This is adjusted in conjunction with Control No. 5 to light spaces) can be seen on the screen, the setting of the give the best possible focus on the corners of the picture. horizontal frequency control is probably incorrect. Adjust 5. Horizontal Positioning Control this control until the picture forms. This control positions the picture horizontally. With the adjustment of these con
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Du Mont 12 In Fig. 6 the use of a copper oxide rectifier and neon set and handled, the first step will be to determine the lamp can be explained as follows. The D.C. component location of the trouble and isolate the defective portion. In necessary for background level, is introduced by the this you will be aided by the design of the receiver, for, as action of the copper oxide (Westector) V24. The neon previously pointed out, the various sections are separately lamp V23 is provided to pro
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Du Mont 13 While no fast rule can be laid down, once the section size of various resistors and it should have a range that failing has been decided on it will generally be found that includes the high resistance values (see the component a systematic check correctly interpreted will locate the parts list). fault. A voltage check of the suspected circuit along with A good voltmeter is also of value and it too should have a the checking of the tubes employed will probably be the high
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Du Mont 14 Equipment (Laboratory) The Type 204B High Frequency Square Wave Generator has the following features. Two ranges of In addition to the equipment recommended for the field square waves generated internally or externally are group the following items are suggested. provided. Range No. 1. 7 to 50 kilocycles continuous. Range No. 2. 50 to 500 kilocycles continuous. Du Mont Type 202 Phasmajector Television Signal Ranges can operate separately or simultaneously. A 1 Ge
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Du Mont 20 RESISTOR VALUES R – Regular S – Special W - Wire R. Ohms Watt Class R. Ohms Watt Class 49 10,000 ½ R 200 500,000 pot S 50 10 meg ½ R 201 2,000 pot R 51 6,000 pot W 202 150 ½ R 52 1 meg ½ R 203 5,000 1 R 53 200,000 2 S 204 400 ½ R 54 80,000 20 W 205 3,000 ½ R 55 100,000 2 S 206 3,000 ½ R 56 100,000 2 S 207 3,000 ½ R 57 500,000 pot S 208 3,000 ½ R 58 15,000 ½ R 209 150 ½ R 59 6,000 pot W 210 5,000 1 R 60 50,000 ½ R 212 3,000 ½ R 6
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Du Mont 21 CONDENSER VALUES C. Mfd. Volts C. Mfd. Volts 69 .1 400 214 .01 400 70 .05 400 215 .01 400 71 .000075 1500 216 .001 400 72 .0025 400 217 3-30 trimmer 73 .0025 400 218 3-30 trimmer 74 .005 500 219 3-30 trimmer 75 25. 50 220 3-30 trimmer 76 .04 1600 221 3-30 trimmer 77 .0005 1500 222 3-30 trimmer 78 .25 400 223 3-30 trimmer 79 .01 1200 224 3-30 trimmer 80 .04 1600 225 L53 81 .1 400 226 L53 82 .25 600 227 L53A 83 .1 1000 228 L53A 84 .1 1000 229 T-20 85 .05
