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1966 1967 Color A HOWARD W. SAMS PUBLICATION NOVEMBER 1966150¢ PF Reporter® the magazine of electronic servicing r 1966 JANUARY AUGUST 2,400,000 color sets sold Know Your 1967 Color Circuits r 1 Servicing Bandpass Amplifiers L . r r plus... 01101,;aa t;It,rA r.u-)V3 ,a.,,,1- .3 Color Chaos A:.; Remote Control Pay TV 7: 3, '; v`. _ 3 r, ^ki New Tube & Transistor Data l FARALc'GR riazi, Improves Color Reception Three Ways 1. Plus GAIN-to provide sharper directivity to Plus -300 and 75 ohm outputs for match to either eliminate multipath reception. twinlead or coax. And full, flat gain over the entire FM band. 2. Plus FLATNESS-to eliminate tilts which cause incorrect colors on the TV screen. Industry Plus these quality mechanical features: Self-clean- experts say that color antennas must be flat within ing wedge -snap locks that tighten with vibration, ±2 db. Paralog-Plus antennas are flat within +1 Cycolac insulators to eliminate cumbersome cross db per channel. feed points, Golden Armor coating, Square boom construction, One-piece antenna array-and more. 3. Plus MATCH -to prevent color -distorting phase shifts. Check on how these plus features can help make plus profits for you. See your Jerrold distributor, The unique feature of the Paralog-Plus is a or write: BI MODAL DIRECTOR system. Its parasitic ele- ments combine two hi -band directors into a single director covering all to -band channels, plus the DISTRIBUTOR SALES DIVISION entire FM band. Thus, more of the elements work 401 Walnut St., Phila., Pa. 19105 to bring in any given channel. JE RIO LO Circle 1 on literature card KNOW YOUR '67 COLOR CIRCUITS by J. W. Phipps Models and CRT Sizes models are carryovers from last ceivers have changed very little. Most of Admiral's '67 color line year and use the TS -A914 chassis. However, there have been a few is made up of 23" and 25" con- The new models employ the TS - changes. Admiral's H12 chassis soles using rectangular CRT's id 918 chassis. A new Motorola de- (used in 23" and 25" sets) em- three basic chassis. However, one veloped and manufactured rectangu- ploys three video IF stages and two 21" console and five 25" solid-state lar picture tube is used in the 21" video amplifier stages. Tube types combination models are also in- models. Olympic is offering a vari- are relatively common except for cluded in the new model group. ety of 23" and 25" sets for '67. the 6BN 11 double -pentode com- Andrea has increased the screen Also included is a 19" portable pactron used in the 1st video ampli- size of their new line to 25"- model which is convertible to a fier and sound IF stages, and a available in four consoles and one console (using a swivel base), or ,6AF9 double -pentode shared by the custom unit for built-in applica- to a consolette (using attachable 2nd video amplifier and burst am- . plifier. - tions. The rectangular CRT used by legs) Offered on many of the con- Andrea uses three video amplifier stages. A -pentode this manufacturer features a bonded sole and combination sets is Olym- triode 6AW8A is used in the first two safety glass, as do most of the big - pic's new "Color Glide"-a multicol- screen picture tubes for the coming or vertical bar mounted on the con- stages and a 12BY7A pentode is used in the 3rd video stage. year. Three chassis are used in trol panel and color coded to corre- Dumont's '67 color models, which spond to the adjusting range of the General Electric's KC chassis offer 19", 23", and 25" screens. tint control. A light glides along this employs three video -amplifier stages While most color manufacturers bar to help the viewer adjust the pic- -the first two use NPN transistors are keepping within the 19" to 25" ture for the proper hue setting. and the third stage uses a 6AG9 size range, General Electric has Philco is using four basic chassis pentode. A tuning meter with a sep- brought forth an 11" portable in a new line comprised of 19", 21", arate transistor amplifier and diode model (to be described later). Also 23" and 25" models. Six chassis are detector (shown in Fig. 1) is also included in this manufacturer's line used in RCA's '67 line. Four of the employed in this chassis. A tank are 19", 23", and 25" models using chassis are new-CTC21, CTC24, circuit and silicon diode in the the new KC chassis. Emerson has CTC25, and CTC25X. Screen sizes emitter -base circuit of the transistor come up with six 23" models, six include 19", 21", and 25". Many detects the 45.75 -MHz picture IF 25" models, and one 19" table models are equipped with one of carrier, which is amplified and cou- model. Three chassis are used in two remote control systems. Setchell pled to the meter. A silicon diode in the new line. 23" and 25" picture Carlson continues to offer "Unit- the collector circuit of the transistor tubes are used in Hoffman's new Ized" chassis in both 23" and 25" serves as a meter damper. As the four-model group. A new 19" port- models. Sylvania's line for the com- fine tuning is adjusted, the meter able is to be introduced soon. ing year features 19", 21" (round), pointer moves to the right with an Two types of 21" round picture and 25" sets. The 19" screen size increase in the picture carrier. Col- tubes are included in Magnovox's is offered in a portable table model, lector voltage is developed across '67 color sets. One uses a bonded while the 21" and 25" sizes are the cathode resistor in the audio- face plate, while the other uses a console sets. Rounding out the line- output stage and applied to the separate safety glass. 21", 23", and up for the coming year is Zenith's collector through a potentiometer in 25" screen sizes are also offered by 19", 21" (round) and 25" screens. the base circuit which adjusts the this manufacturer. Motorola's new full-scale deflection of the meter. color line consists of 46 models and luminance Channels General Electric's 11" HC chas- includes three picture tube sizes- sis makes extensive use of corn- 21", 23" and 25". Thirteen of the The Y signal circuits of most re- pactrons throughóut all circuit func- Fig. 1. Tuning meter circuit in General Electric KC chassis. Fig. S. Tuning indicator circuit employed in Philco receivers. PF REPORTER, November, 1966 Vol. 16, No. 11 PF REPORTER is published monthly by Howard W. Sams & Co., Inc., 4300 W. 62nd, Indianapolis, Indiana 46206. Second-class postage paid at Indianapolis, Indiana. 1, 2 & 3 year subscription prices; U.S.A., its possessions and Canada: $5.00, $8.00, $10.00. Other countries: $6.00, $10.00, $13.00. Current single issues 50c each; back issues 654 each. November, 1966/PF REPORTER 1 2ND VIDEO AMP 120012HG7 CRT DELAY LINE CATHODES VIDEO INPUT VIDEO 56 PEAKING 100K 30K CONTRAST 680F1 1200 BRIGHTNESS CONTROL NEGATIVE PULSE FROM VERTICAL OUTPUT Fig. 3. Blanking and video peaking in RCA chassis. Fig. 4. Final luminance channel in Zenith's new chassis. tions. In the luminance channel, a shadow will appear. The less posi- ative pulse from the vertical output double pentode 8AR11 performs tive the ray-control electrode, the transformer is applied to the diode, in the 1st and 2nd video IFs, an wider the shadow. As a station is reverse biasing it. At the same time, 88011 pentode functions in the 3rd tuned in, the amplitude of the video the negative pulse is also applied to IF stage, and the pentode section carrier increases and develops an the grid of the 2nd video amplifier, of a double-triode/pentode is used increasingly negative voltage in the driving the grid more negative. The in the single video amplifier stage. indicator rectifier circuit. This neg- negative pulse at the grid is reflected Shown in Fig. 2 is Philco's new ative potential biases the indicator as a positive going pulse at the plate. tuning eye, used in chassis 17M- DC amplifier (triode section), caus- This positive pulse is then applied T80B, 17NT82, and 17QT85A. The ing an increase in plate voltage and to the CRT cathodes, cutting off the purpose of this customer aid is to consequently, an increase in the CRT during vertical retrace. The provide an accurate means of fine potential applied to the ray -control amplitude of the blanking pulse at tuning. The tuning eye employed in electrode, which reduces the shadow the plate will decrease as the bright- the system is a fluorescent -target, and causes the "eye" to close. ness is decreased or the contrast in- vacuum tube type with a bar type Except for the addition of the creased. Therefore, the amplitude of presentation. Operation of the tun- tuning indicator to the three chassis the blanking pulse will depend on ing indicator is based upon a prop- indicated, the luminance channel the brightness and contrast control erly aligned receiver. The indicator circuitry in Philco's new line re- settings. However, one of the nota- circuit operates from the video car- mains unchanged and continues ble features of this blanking circuit rier level and assumes that when to use transistors in the video IF, is its ability to cut off the CRT the video carrier is at maximum, the AGC, and video -driver circuits. cathodes during vertical retrace, re- receiver is properly tuned for the Andrea, Dumont, Emerson, Hoff- gardless of the brightness or con- best b -w picture, best color without man, Magnavox, Motorola, Setchell trast control settings.
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