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Latest in Radio:,- Electronics - Television Canada Man ND1E-TALKIE FOR INDUS IAL USE NOV 1 9 4 8 30 U. S. and LATEST IN RADIO:,- ELECTRONICS - TELEVISION CANADA MAN . 5E o\\`r9 N rst '"Gos ;dec P P `° och `ca\ 4 /:(tNE . ors R r e/4 Ill' the \t s ate s44 ot9 or`1otstems' the\P what tr `d,, r`I 010 ?r. \,e°er Moroo\ be 5a se °\ ' ßßd CM" M VOLUME 1 ". e . of course we have all 17 RIDER MANUALS." RIDER pp MANUAL .. and attribute a good bit of our success in producing a quantity of work in a minimum of time to their always dependable, complete, mut factory information. We will have Volume XVIII as soon as it Is published." Covers 145 Manufacturers' Amplifiers, from 1938 to Date Bigger and better than even we had antici- pated, the scope and thoroughness of this first industry -wide PA service manual makes it an \opts. essential piece of equipment for any shop doing PA work. It covers public address systems, outdoor announcing, musical instruments and phonographs, theatre and church hearing aids, electronic mega- phones, intercommunications systems, theatre and home motion pictures, school, hotel and hospital sound systems, mobile and portable sound systems. ' oc.e, TOO -NEED ALL 17 RIDER MANUALS It provides schematics, voltage and resistance Volume XVII $16.50 Abridged Manuals I to V tables, tube and chassis layouts, Installation notes, Volume XVI 8.40 (one volume) . $19.80 instructions, impedance matching. Volume XV 19.80 Record Changers and operational Volume XIV to VII Recorders 9.00 Separate "HOW IT WORKS" book explains the (each volume) . 16.50 theory of various designs employed in different Master Index, covering 2030 Pages in this new Volume VI 14.50 Manuals, Vols. Ito XV 1.50 the PA types of amplifier systems, servicing of RICER FIRST plusseparate systems, using the sine wave and square wave "HOW IT WORKS" and voL.1 RIDER '7el ec«e c.t MANUAL means of checking, methods of rapidly locating INDEX $18.00 faults. Everything you need. 1400Pages, PLUS separate "HOW IT WORKS" and Index, $18.00. ORDER YOURS TODAY! Everything that most be known about the 1946 -47 television receivers (completo and kit) of 34 manufacturers. Separate "How It Works" covers theory of television; trans- mission and reception, frequency standards, antennas, various RIDER MANUALS portions of receivers. MEAN SUCCESSFUL SERVICING Television "HOW IT WORKS" Available Separately If television is not yet in your area, it will be soon. Hero is JOHN F. RIDER, PUBLISHER, Inc., 404 Fourth Avenue, N. Y. 16 theory 208 you want. pages S4 70 Export Agent: Rocke International Corp., 13 E. 40th St., N.Y.C. Cable ARAB NOTE: The Mallory Radio Service Encyclopedia, 6th edition, makes reference to only one source of radio receiver schematics -Rider Manuals. ANOTHER NOTE. The C -D Capacitor Manual for Rodio Servicing, 1948 edition No. 4, makes reference to only one source of receiver schematics -Rider Manuals HaveYou Met the Little Fellow with the Advantages MalloeThe A// New Offers These BIG Ad vantages . The small size of the Mallory Midgetrol lets you service portables, auto MARK radios and small AC -DC receivers which require 15/ts" controls. - SIMPL The unique shaft design of the Alallory Midgetrol saves installation time INSTALL with all types of knobs. Electrical characteristics let you use the M \Iidgetrol to replace SIMPLER 11/8" as As ell as 15/16" controls. Stocks reduced because STOCKIN are further no special shafts are needed. 'l'Ire Mallory Midgetrol is unusual'. quiet, both me- NEW SIZE NEW ELEMENT chanically and electrically NEW DESIGN NEW CONTACT -and tests prove it stays NEW SHAFT NEW TERMINAL quiet. In addition, the Mal- NEW EXTENSION NEW TWO -POINT has nine y lory Midgetrol all NEW SWITCH SUSPENSION nere features. It's the NEW Standard in Carbon Controls. See your Alallory distributor. P. R. MALLORY . CQtnc. CAPACITORS ... CONTROLS ... VIBRATORS ... SWITCHES ... RESISTORS ... RECTIFIERS... MALLORY VIBRAPACK* POWER SUPPLIES... FILTERS Rp. u. s. Pot. Off. APPROVED PRECISION PRODUCTS 0 . R. MALLORY & CO., Inc., INDIANAPOLIS 6, INDIANA ...the - automatically ra Cates one of 18 separate scales into position as you select the range. SIMPSON MODEL 221 ROTO- RANGER Ranges HIGH- SENSITIVITY A.C. -D.C. VOLT- OHM -MILLIAMMETER 20,000 Ohms per Volt D.C., 1,000 Ohms per Volt Here is the only multiple scale test instrument of its kind in the world. A.C. Volts, A.C.: 2 5, 10, 50, 250, 1000, 5000 It reduces definitely the possibility of errors by providing a single scale Volts, D.C.: 2 5, 10, 50, 300, 1000, 5000 for each range of this finest of voltohm- milliammeters. As the selector Milliamperes, D.C.: 10, 100, 500 switch is moved to the range desired, an ingenious gearing mechanism Microamperes. D.C.: 100 Amperes, D.C.: 10 rotates a drum, bringing into place behind the meter window the proper Output: 2.5, 10, 50, 250, 1000 scale for that range. Here is the 25 separate equivalent of instru- Ohms: 0.2000 (12 ohms center), 0- 200,000 (1200 ments combined in one sturdy and compact unit. (18 scales; 7 additional ohms center), 0 -20 megohms (120,000 ohms center). direct reading ranges through use of high voltage and jack output Size: 123.4" > 101/4" x 5311" The patented Roto- Ranger principle eliminates the confusion of nu Weight: 8 lbs. 9 oz. erous readings on one scale, and the multiplying factors common t Price, complete with test leads and 28 -Page Operator's Manual $69.85 ordinary multi -range testers, by providing a separate scale for each range. There are no cramped calibrations in these full sized Roto- High voltage probe (25,000 volts) for TV, radar, x -ray and other high Ranger scales. Each is designed as it would be for a separate instrument. voltage tests, also available. SIMPSON ELECTRIC COMPANY Ask your Jobber, or write for 5200 -5218 W. Kinzie St., Chicago 44, III. complete descriptive literature In Canada: Bach -Simpson, Ltd., L London, Ontario IP °CMAMPS to MA- 2000 OMMS 100 M.A - p0cio0O5 A separate scale SOO M.A for every range - t pMi,S automatically! IO AMPS SVAC LSV.O.C ipVAC o V.D.C AC SO Y D.C 750 YA C po YD.C. !00°YA[. .o.0 Large 5' r" meter, with 18 separate, full length scales) COMMON OUTPUT A.c. D,C. 98 Whether you require large quantities of relays for production runs or single units for laboratory or amateur work, Wells can make immediate delivery RELAYS and save you a substantial part of the cost. Our capable engineering staff is prepared to offer assistance in the selection of correct types to suit FOR EVERY PURPOSE your exact requirements. Each relay is brand new, standard make, inspected, Over a Million in Stock! individually boxed and fully guaranteed. The following list represents only a tiny portion of J our relay stock. Write or wire us for information on STANDARD DC TELEPHONE RELAYS types not shown. senmel Stock Operating Coll Net AD No. Voltage Resistance Contacts Manufacturer Each R -101 24V 1500. DPST (NO) Auto. Elec. $1.35 R -102 24V 400. SPOT Auto. Elec. 1.10 RM1-T31 R -103 24V DUAL -1000 3PST (NO) Auto. Elec. 1.35 CUTLER HAMMER RIOS 24V 600. 3PST (NO) Clore 1.20 HEAVY DUTY CONTACTORS R.106 24V 1300. 3PST (NC) Clare 1.25 R -152 12V 50 DPDT -SPST (NO) Guardian 1.10 R 153 12V 200. SPDT SPST (NO) Stromberg 1.25 8.154 12V 200. SPST (NO) are 1.20 SENSITIVE Stock Operating Coil Net 0.155 I2V 100. SPST (4N04NC) Auto Elec. 1.15 DC RELAYS No. Voltage Resistance Contacts Manufacturer Each R -158 6V 50 4PST (NO) Stromberg 1.10 R-178 24V DC 100 SPST (NO) 100A. 6141H34A $3.85 R -159 6V 50 DPST !NO) Stromberg 1.10 R.179 6V DC 6.5 SPSTIND) 50A. 60411183A 3.00 R-160 6V 12 3PDT -3PST !NO) Auto. Elec. 1.05 R-180 12V DC 25 SPST NO) 50A. 60411308 3.25 R -161 6V 10 3PST(2NC -INO) Auto Elec .90 R-181 24V DC 65 SPSTINO)100A. 6041H8B 3.85 R -121 150V 5000 2PST (NO) SPDT Clore 1.65 Stack Operating Coil Net H-232 24V 55 SPST(NO) 50A. Metal Cased 3.25 R -12" 150V 6300 SPST (NO) Clare 1.75 No. Voltage Resnbnce Contacts Manufacturer Each H-233 6V 15 SPST(NO) 50A. Metal Cased 3.15 R -6) 150V 6500 3PST (NO) Clare 1.75 R.211 4.6V 18000 SPDT Kaltman 220C $1.95 H-235 24V 70. SPSTiN01100A. Type 616 3 85 R -51: 24V 750 SPST (NO) Clare 1.25 R -220 8- 5000 SPDT Allied Cont. 1.2) R -521 12V 250 DPST (NO) Clare 1.20 R -221 16. 24V 5000 SPST (NO) Allied Cont. 1.1. DIRECT CURRENT AIRCRAFT CONTACTORS R -519 I 250V 14000. SPDT Auto. Elec. 1.95 R -174 256: 5000 DPST NO) G.M. 1.8 Slack Operating Cail Net R -520 DPDT R.B.M. R 250V 14000 2.10 -175 358V 11000 DPDT -DPST (NO) G M 295 co. Voilage Resistance Contacts Manufacturer Each R -521 32V 1000. DPDT Kellogg 1.20 R -176 2CV 250 DPST (NO) G.M. 1.50 1 182 28V 80 SPST NO) 25 A Guardian $1.85 R.166 24V DUAL -200 DPOT-SPST (NO) Stromberg 1.59 R -177 4PD1 G.M. 1.65 24V 300 0 183 24V 60 SPST NO) 50 A. Allen Bradley 2.75 R -168 /PST rNO( R 24V DUAL-200 Auto.
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