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what 25,000 Servicemen told Bill Anderson (SYLVANIA Sales Service Engineer) about PHOTOFACT... SYLVANIA uir,rres CIS ,sr -©. W. J. ANDERSON SYLVANIA Sales Service Engineer, Radio & TV Tube Sales "During the years of 1951 and 1952, Robert Grow and have etalked to approximately located throughout the United States. We have an excellent idea ese concerning the response of men tor y PHOTOFACT Service and u to your publications. Ih talking to servicemen, I have heard many fine compliments on the excellent job your organization is doing. Such comments as these are typical: 1. Very detailed and t ás well as instructions on any pictures and schematics. 2. The theory of operation of vari- fuel, such as found in the PHOTOFACr 3. The immense amount of useful short time presented c fters release of the manufacturer. wave forms, as 4. w Pictures of measurements saves time and increases profit to the servicemen. These and many more are typical of the comments f serviceof interest to you men. This may you continue and your staff as y to lead the field in technical publications for the radio and television servicemen." ewd Syi s,is Electric Products Inc. Improved Power Supply (Continued from page 42) circuit. Plates go to opposite sides of the high -voltage transformer winding. Cathodes are connected together and feed a regular condenser -input filter CH,, C. The grids of the rectifier tubes are connected together through parasitic - suppression resistors R,, R,, to the movable arm of the potentiometer R,. This potentiometer is the main voltage control. A potential of around 400 volts is maintained across R:, by means of an auxiliary positive supply consisting of three small selenium rectifiers Rect.,, Rect and Rect., and a single filter condenser C:,. This auxiliary supply is almost the only extra equipment required as contrasted to an ordinary condenser -input power supply using a 5Y3 or 5U4 rectifier. Cost of the extra parts is quite small and the space required is negligible. A 6X4, 6X5, or similar rectifier tube can be used in place of the selenium rectifiers if desired, provided suitable filament windings are available on the power transformer. The transformer used in this particular power supply was a commercial surplus unit having two 6.3 volt filament windings, and a plate winding of 700 volts center -tapped at 70 ma. There are few replacement -type or new- equipment type transformers on the market which have the necessary two filament windings, although some suitable types may appear with the increasing use of the 6.3 volt heater -type rectifier tubes such as the 6AX4. Hence, any handy transformer delivering enough voltage will do, and it may be necessary to add a filament transformer to get the extra 6.3 volt filament source that the circuit demands. Output Characteristics Fig. 3C shows curves of output voltage vs output current. Maximum output is 290 volts at 80 ma.; minimum output is about 50 volts no load. The minimum no -load voltage is essentially the cut-off bias of the tubes at the applied plate voltage. When the d.c. output voltage is 50, the applied plate voltage is 350 -50, or 300 r.m.s. When the d.c. output voltage is high, say 300, the plate voltage is only about 50, because the cathodes are so high above ground. The drop - off in the regulation curves at high voltage (300) is due to the lack of adequate plate- cathode voltage to give good current conduction through the tubes. If more output at high voltages is desired, use a power transformer with higher secondary voltage -400 or 450. Limiting factor at low output voltages is plate dissipation. Suppose we want to draw 80 ma. at 50 volts. The voltage across the tubes is 300, the total current 80 ma.; power loss in the tubes is 24 watts. This is a shade over the rated dissipation of 10 watts per tube --20 watts total. But at 250 volts and 80 ma., the actual plate dissipation is only (350 - 250) X .08 = 8 watts, or 4 watts per tube. For a generally beefier power supply, use a transformer delivering about 450 volts each side, and a pair of 6L6's for rectifiers. These bottles with the man - sized bulbs are rated at 19 watts dissipation. The small 6W6 has the virtue of very low voltage drop at zero bias, and so holds up better at the high end than most other tubes, when the available transformer voltage is limited. However, 6V6's work nearly as well -the droop in the top -voltage output curve is a bit worse. 6K6's and 6F6's will give about the same results. An outstanding virtue of this type of power supply is its lack of fussiness about tube types and other component variations. A 5" x 6" x 9" utility box was used for the cabinet, the chassis a standard unit cut down to fit inside. If tubes larger than 6V6's are used, the box will have to be larger. In any case, cut plenty of ventilating holes in the back. An output voltmeter is very desira- Fig. 4. Rear chassis view of the cathode- follower supply showing the parts layout. NOW! GET THE PROOF FOR YOURSELF! FREE We'll send you a Free Photofact Folder on any receiver listed in "PF Index 8 Technical Digest." Learn for yourself -af our expense -how PHOTO - FACT pays for itself by earning bigger repair profits for youl Select any Folder from the PF Index (if you haven't an index, get a copy from your distributor). When you write us for your Free Folder, be sure to state Photofact Set and Folder Number as shown in the Index. Get your Free Folder now. Examine, use, compare -see why you can't afford to be without PHOTOFACTI HOWARD W. SAMS & CO., INC. 2203 E. 46th St., Indianapolis 5, Ind. 114 HOWARD W. SAMS & CO., INC. RADIO & TELEVISION NEWS
le in any variable power supply, not only for convenience but fol safety. There are always some types of parts failures which will cause thi supply to put out its maximum vol age, irrespective of the control sets ing; although this type of failure s much less likely in the supply described here than in the more complicated regulated supplies. REFERENCES 1. Houle. J.: "Wide-Range Volt roe P. n- ulatorx." Electrolties, August 1951. 2. Walker. A. H. X.: "Variable Il.T. ¡'o,- er Puck,' Wireless World, Septe,io.er TORONTO ON TV NET NETWORK television service I as been extended to Toronto, Canada through Buffalo by means of It radinrelay rotate across Lake Ontarin. This 66 -mile, two -section ront,'. which was constructed by Tye Bell Telepl C pany of Canada provides a single TV channel from Buffalo to Toronto at the present t . Mon - t real will be added later this Sp ing via rowave link f l'ornato. -3 - FREQUENCY CHECKING By RUFUS P. TURNER. BSA THE well -known "spot-wheel" ,seilloscope pattern is handier than Li + sajous loop patterns for checking an ur known audio frequency in terms of a st indard frequency when the ratio betwn en the two is high. But this pattern r: quires an external phase- shifting RC network which often is not convenient to operate. The network may be eliminated if the unknown signal is applied to the 'Intensity Modulat' " (Z-axis input of the oscilloscope, and the st ;lndard frequency to the horizontal antplitier input. The internal sweep is no used. The result is a straight horizontal line broken up into dots or segments. as sl 'n in Fig. 1. The unknown frequency is determined by multiplying the standard frequency by the n amber of dots. Keep the intensity as ow as visibility permits, otherwise th4 glare will obscure the segments. -- Fig. 1. Broken -line frequency ¡dent fication pattern on scope screen. Here the test frequency (540 cycles) is 9 time:. the 60-cycle reference frequency. In th: s instance the 60 -cycle sine -wave sweep of the scope is used as the horizontal reference trace and the test -frequency si lnal is applied to "Intensity Mod." it put. April, 1953 RECEIVER AND TRANSMITTER RECEIVER BC- 229 -TRF Receiver with 3 Plug -In Coils to cover Freq. Range 201 to 398. 2500 -4700. 4150 -7700 KC. With 6 Tubes: 1/37 -1/38-3/39. Power Supply required. 6 or 12 Volt & 250 Volts. Size: 16"x8 "x7". Schematic included s8.95 TRANSMITTER BC-230-Voice modulated Trans. with 5 Plugin Coils to cover Freq. Range 2500 to 7700 KC. With 4 Tubes: 2 10y -2/45 i RF Meter 0 -1.5 Amps. Power Supply required, 6 or 12 Volt 3 350 Volts. Size: 13 "ali-x7". Schematic included $8.95 SPECIAL BUY -BOTH RECEIVER AND TRANS- MITTER 515.00 REVERSIBLE MOTOR Motor Reversible -3.7 RPM. 40 Ib. torque. 24 Volt DC or AC. Motor size: 5' /e" is 4. 1/32" x 3- 5/16 ". Shaft size: 21/32" x 5/16 ". Philco No. 441.1008 NEW: $1.91 110 Volt AC TRANSFORMER to operate above motor NEW: BC -645 TRANSCEIVER Antennas Plugs Mounts Parts, Etc. TRANSCEIVER -Easily converted to 420 to 500 MC Bands. Instructions furnished for 460.470 MC Citizen Band. Complete with PE -101 Dynamotor, Control Box. Tubes. and Mount ANTENNA TWO UHF '/ WAVE with Set of 8 Plugs $7.95 MOUNTINGS For: Transceiver: $1.511- Dynamotor: 7'M Control Box Sur CONNECTOR PLUGS -Set of 8 44.00 SET OF COILS -I -2.3 -4th IF. Oscillator. Ant Loop. Any.; Guide and L Rod Any., etc. 4595 POWER SUPPLIES VIBRATOR TYPE -6 Volt DC input: output 230 Volt DC 50 MA. -not filtered -w /tube. Ideal for Command Receiver operation as receiver is filtered Internally. Size: 41/2" X 4'a" X 3Ve" $5.95 PE157 POWER SUPPLY -2 Volt Vibrator Supply operates from BB -54 2 Volt Battery mounted in Case. Output voltage 1.4 V. rr Amp. 125 V. 50 MA. Less Battery. Speaker. & External Power Cord -with Vibrator Used.84.95 Bß54 2 Volt Dry Battery 2.95 MP28 BA Power Supply & Modulator 1; TA -12-New: 29.95 Power Supply No. 3 f /Mark II No. 19 Radio Set 12 or 24 V. Two PM Dynamoton: 500 V. 50 MA: 275 V. 110 MA -New: 12.95 PE104 Vibrator Unit f -BC -654 Used 10.:5 550C Vibrator f PE-104-New 1.9:; ANTENNA EQUIPMENT MAST BASES -INSULATED: MP -132 BASE -Illustrated at left -I" heavy coil spring. 2" insulator. Overall length: 111/2." Weight: 2 ?í lbs. Price $1 115 MP -S-33 BASE -Insulated type with heavy coil spring and 5" die. insulator. Requires 2" hole for mounting. Weight: 9 lbs. $5.95 MAST SECTIONS FOR ABOVE BASES Tubular steel. cozper coated. painted. In 3 It. sections. screw -in type. MS -53 can be used to ,make any length with MS- 52- 5140.49 for taper. Any section 5ne Each Larger Diameter Section: MS -54 $1. .... COMMAND EQUIPMENT BC -459 Transmitter -7 to 9 MC. -Used 14.95 BC -455 Receiver-6 to 9 MC -Used 10.95 BC -456 Modulator.. NEW: $1.95 Used 2.95 Transmitter Rack -Single: $1.5"- Dual 2.1111 Rec. Rack- Triple: $2.50. Modulator -Sftg 1.50 Rec. Dyn. -Used: $2.95, Trans. Dyn. -Used 2.115 TRANS. -REC.- AMPLIFIERS RA -10 DA RECEIVER NEW: 49.95 TA -12B TRANSMITTER with Tubes- Used....$59.95 RI'ARR.! Receiver -easily converted to 220 MC. (See R.N. Jan. '49) Complete w /Tubes. NEW $4. RT7 /APN -1 Transceivers -120 MC. Complete with Tubes 4 Dyn NEW: 824.95- -USED: $1 ;. ARC4 Transceiver -140 144 MC. w /Tubes- Used:12'.- BC1206- 200.400 KC. Delco. w /Tubes BC -216 Amplifier -2 Tubes -6F7, 39/41 BC -367 Amplifier- w'Tubes. lesa Dyn 4. Caw 4. BC- 605 -With Tubes, Used BC- 709 -W/Tubes -New: $4.95 Used: 5.'. BC -347-Less Tubes -New: $2.95 Used: I. BLOWERS -115 VAC 60 CYCLE SINGLE TYPE: (Illustrated at left) 100 CFM. 2'e" Intake: 2" out'et. Complete size: 5" x 6 ". Order No. 1C939 $8.95 DUAL TYPE: 100 CFM. 4" intake: 2" Dis. Each Side. Con plate Size: 8" x 6 ". Order No. 1C880 5l3 95 COMPACT TYPE: 108 CFM. Motor built Inside squirrel rage. 41/2" intake: 3%" x 3" Dig. Complete size: 41/2" W x 2 %" H x 8Va" D. Order No. 2C067 $14.511 FLANGE TYPE: 140 CFM. 3 "" Intake; 2'/2" Dis. Complete size: 7'/e" W x 71," H x 6 %" D. Order No. 10807 $13.115 FLANGE TWIN: 275 CFM. 4'a" intake: 3 "e" x 3" DIs. Complete size: 113/4' W x 8'o" H x 8 -1/16" D. Order No. 2C069 $21.9: BC -223 EQUIPMENT CABLES w /PL -150 ea. end NEW: $ 2.50 POWER SUPPLY PE- 125 -AX 20.95 MOUNTING for Transmitter 1.75 OPERATING MANUAL 2.50 TUNING UNIT- TU -17 -2 to 3 MC. -NEW. In Case 4.511 BC -223 TRANSMITTER -Less Tubes, Meter and Front Panel 4.95 AERIAL WIRE -Phosphorus Bronze ::I6 Stranded. 200 Ib. test. Weatherproof. 150 Ft. on Reel. RL -3 w Clips $1.50 Telephone Wire -3 Cond. copper 6 steel. 525 Ft 4.75 DYNAMOTORS DYNAMOTOR and BLOWER: 9 Volts DC Input; out. put 450 Volts 60 MA. 4510 RPM. At 6 put; output 260 Volts 65 MA. 3000 RPM Price n INPUT: OUTPUT: STOCK vo.: PRICE: 14 V. DC 600 V. 300 MA. B0-86 $9.95 12 V. DC 220 V. 70 MA. D51-24 0.95 12 V. DC 220 V. 100 MA. DM-18 4.95 14 V. DC 375 V. 150 MA. 0M-375 8.95 14 V. DC 330 V. 135 MA. 0M-330 7.95 14 V. DC 500 V. 500 MA. PE-59 14.95 12 or 24 V. DC 275 V. 110 MA. USA-0518 3.95 12 V. DC 250 V. 50 MA. DM-25 8.95 12 or 24 V. DC 500 V. 50 MA. USA/0315 3.95 12 or 24 V. DC 440 V. 200 MA. 225 V. 100 MA. D-104 14.95 28 V. DC 250 V. 60 MA. PE-86 5.95 PE -101C DYNAMOTOR 6 or 12 Volt I Reprints of original CO conversion articles - Oct. and Dec., 1952 issues. furnished.) This is the Dynamotor the Hams have been talking about! Easil ed to supply 625 V. @ 150 MA. and 325 V. 125a MA. at 12 Volts-or 300 V. 90 MA. and 160 V. 110 MA. at 6 Volts. (Illustration shows modified.) NEW: $4.95 AIRCRAFT CONTROL CABLE 3'32" -757 Strand. Weatherproofed. Galvanized, Preformed. 920 lb. tot. Ideal for Television Guy ing and many other uses. Prices: 4Sz per Ft.-I000 Ft. or more @ 4c per Ft. BATTERY SWITCHING UNIT and METERused to switch load from one battery to another -or 6 to 12 Volts. Contains Weston 2" Meter -0.15 Volt DC Scale for reading battery voltage. 20 Amp DPDT Switch and Indicator. Case size: 4" x 61/2" x 2N" NEW: $2...:. TRANSFORMERS AND CHOKES TRANSFORMERS -I10 V. 60 CYCLE PRIMARIES: 5 Volt CT- 25A- 10.000 V. Ins. OPEN FRAME ---6' o 5 "xVie" -- 6.3 V. I Amp.....1.25 24 V. I Amp..... 24 V. V2 Amp ..... 1.50 24 V. 6.5 Amp 6-24--or 30 Volt 8 Amp Two 12 V. 4 A. windings, Alves 12 V. 8 A. or 24 V.4 A. 325.0.325 V. 50 MA-6.3 V. 2.5 A: 6.3 V. .6 A (Rect. 6x5) Hall Shell-2%"x3% "x3"-No. T -23.28 2.75 440 VCT, 70 MA -5 V. 2 A. -6.3 V. 4 A 460 VCT. 90 MA-5 V. 3 A; 6.3 V. 4 A 175.0.175 V. 40 MA-6.3 V. @ 2.4 A; 6.3 V @ .6 A;Halfshell 2 %'k2 3 /16"x2 % -No. T- 23.40 1.7.7 350.0 -350 V. 90 MA-6.3 V. @ 3 A; 5 V. @ 3 A; Upright- 31/a "x3 1/2"x3 %" 3 2, CHOKES 15 Henries -155 MA. 125 ohms $2.95 5 Henries -150 MA. 85 ohms DC -Res. Cased I.D" 8 Henries -I50 MA. 200 ohms I 5 -20 Henries -300 MA. 110 ohms, 1000 V. Ins Address Dept. RN Minimum Order S5.00 Prices F.O.B., Lima, O. 25 ;'o Deposit on C.O.D. Orders FAIR RADIO SALES 132 SOUTH MAIN ST. LIMA, OHIO 115
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T EVIS i N APRIL 1953 IN THIS ISSUE
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YOU PRACTICE COMMUNICATIONS with Ki
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I NOW...from D.T.I.s MILLION DOLLAR
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"I Read You Five." Welcome Words! H
Page 9 and 10:
THE ONLY COMPLETE CATALOG FOR EVERY
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Get yourself on the beam to the BIG
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Look! New small size Adashaft Radio
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FETTER RECEPTION EVERY Ol oN 1111.
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A LOOK INSIDE PROVES WHY PAY A SERV
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TELEVISION RADAR ELECTRONICS RESEAR
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BETA RADIATION GAUGING METHODS By G
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would have in controlling the proce
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is done, the meter on the Microvolt
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I voltage regulation', '.'. as well
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DECAY CONSTANT IN VIBRATING SYSTEMS
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I I (5000), and Curie point* occurr
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COAXIAL CAVITY TUNING ELEMENT Fig.
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Make your U H F circuits as simple
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(// Capacitors shown 21 /7 times ac
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RCA N E E DS E NGI N E E RS who won
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O N FREQUENCY CONTROL FOR MILITARY
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i Gpoßt i. NOW YOU CAN 4 pvRAVE ti
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known as the 5894 -A, because the c
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Ticnife "FILTER DESIGN DATA FOR COM
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Converter Calibration (Continued fr
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For opportunities within your reach
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Sweeping the Country! Collins Audio
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ULTRA FAN series-Complete VHF -UHF
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1 029 Leonard C. Lane, B.S., M.A. ;
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A Transistor of point -contact type
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PH I LCO TESTERS Now Yours on NEW S
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Mriiffffifff(i ( l ((( THE RADIART
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TRAIN FASTER- TRAIN BETTER- TRAIN E
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A ROBOT ELECTRONIC TURTLE Closeup v
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7. Solder to the ends of the Fa " s
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THE semi -automatic or "bug" key is
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' even a small wooden box may be us
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Fig. 1. The compact, versatile mobi
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access to a surplus TU -10-B tuning
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CHANNELS Pertinent frequencies and
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quency definition probably wasn't n
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conicals are usually stacked two or
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THE U T SPEAKER ENCLOSURE Design de
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a drop of 6 db -per- octave above 5
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Fig. 1. (Left) Front panel view of
Page 91 and 92: Fig. 3. Bottom view of the 30-watt
Page 93 and 94: A LOWR[SISTA NCE OHMMETER _ By J. P
Page 95 and 96: By HAROLD HARRIS Vice -President, E
Page 97 and 98: erticle, the results are not too fa
Page 99 and 100: Sete/t SHORT -WAVE Compiled by KENN
Page 101 and 102: dual triodes with the necessary int
Page 103 and 104: You, ecutiAtea a &LtAufoP4Lo ctZ& b
Page 105 and 106: The data that Launched Thousands of
Page 107 and 108: Te MANUALS SHOW YOU HOW. Here is vi
Page 109 and 110: NEW WIDE BAND VERTICAL AMPLIFIE Dir
Page 111 and 112: Indicates frequency of energized ci
Page 113 and 114: NAL TRACER KIT OCATOR AND WATTMETER
Page 115 and 116: Mod.loied or nwdc kited RF output.
Page 117 and 118: SUPERHETERODYNE High gain dual iron
Page 119 and 120: H. D. Suesholtz, General Manager, T
Page 121 and 122: It will count events occurring eith
Page 123 and 124: 1 EE101so Mc, MAIL YOUR ORDER TODAY
Page 125 and 126: Which Yo Want? Guet your FCC Ticket
Page 127 and 128: Code Practice Oscillator (Continued
Page 129 and 130: . =Ms or ...eel, u ' tically. topla
Page 131 and 132: 1 II{ Phono Equalizers (Continued f
Page 133 and 134: 1 BA" None None Top Top THE BEST IN
Page 135 and 136: What's New in Rac io (Continued fro
Page 137 and 138: 59 .n 89 60 .89 54.95 . .69 . 1.59
Page 139 and 140: a noted 0630 with news, strong leve
Page 141: Clearly ' lia) Radio France -Asie,
Page 145 and 146: . SI9.95 \I e \ With 1 \I I.IB . 1.
Page 147 and 148: denser (Admiral par number 65B6 -26
Page 149 and 150: nllent 95 D.e.198 e B d. Adjust the
Page 151 and 152: Antenna Measurements (Continued fro
Page 153 and 154: impedance" and is an import ant con
Page 155 and 156: - 1 Junius Heard with news 0730 on
Page 157 and 158: allo is French session 0630 on 15.1
Page 159 and 160: v IlIllIllIlli IllIllIllIll
Page 161 and 162: NEW TV PRODUCTS On The Market "TELO
Page 163 and 164: entire u.h.f. band. A sin ;le switc
Page 165 and 166: layout charts and floor arrangement
Page 167 and 168: Fringe Antennas (Continued from pag
Page 169 and 170: a theater TV in the frequency spect
Page 171 and 172: Receiver Change s (Continued from p
Page 173 and 174: :nrh BF "BASIC ELECTRONIC TEST INST
Page 175 and 176: S0.62 f tical and easily- understoo
Page 177 and 178: B2 IT'S TERRIFIC! Fig. 3. Circuit t
Page 179 and 180: h' SGP1 7867 Within the Indust.), (
Page 181 and 182: VARIABLE PULSE LIGHT SOURCE HUNGER
Page 183 and 184: completely new system of closed con
Page 185 and 186: p ice businessman sells time, know
Page 187 and 188: It is apparent from the information
Page 189 and 190: 1 -Improving Ir71 vision Technician
Page 191 and 192: i 2 Rate 50c per word. Minimum 10 w
Page 193 and 194:
Assembling the components of Raythe
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