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Design for a "Quality" Receiver

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Design for a IS UE'S DESIGN FOR A "QUALITY" RECEIVER Vol. LITI. No. 12 www.americanradiohistory.com Advertisements írc1cS% World December, 1947 The Research Engineer knows that the best speaker for any set is one that offers complete reliability plus true tonal fidelity. After exhaustive tests his advice is always the same -fit Rola and relax ! BRITISH ROLA LTD 8 UPPER GROSVENOR STREET LONDON W.1 www.americanradiohistory.com December, 1947 Wireless World Advertisements r The 50 -range Model 7 Universal AvoMeter, the pioneer of the compre- hensive range of " Avo " Precision Instruments, is the world's most widely used combination electrical testing instrument. Fully descriptive pamphlet available from the Sole Proprietors and Manufacturers :- THE AUTOMATIC COIL WINDER & ELECTRICAL EQUIPMENT CO., LTD. - - ICTORIAi404/9 W I N D E R H O J S E D O U G L A S S T R E E T L O N D O N S W T'ELEPHONE. V www.americanradiohistory.com 2 Advertisements Wireless World December, 19¢7 MARCONI 1Vlastery of 1Vleasirrement is displayed in its unique range of Communications Test Gear FOR IMMEDIATE DELIVERY . IMPEDANCE COMPARISON BRIDGE TYPE TF 202E The instrument is a self- contained A.C. mains Brief Specification: operated bridge for the rapid comparison of Operating Frequency - 10 kc /s; similar capacitors, inductors or resistors and Range - - - L 250p11-1H ; comprises a 10 kc/s oscillator, a bridge network C 20ppF -lµF; and a visual balance- indicating system. It is R 20 ohms-1M ohm ; precision -made to give lasting. reliable service Accuracy - ± 0.2% MARCONI INSTRUMENTS LTD ST. ALBANS, HERTFORDSHIRE Phone: St Albans 6161 5 Office : 30 Northern ALBION STREET, HULL. Hull 16144 Western Office : 10 PORTVIEW ROAD, MONMOUTH, BRISTOL. Avonmouth 438 Southern Office: IC9 EATON SQUARE, LONDON, 5."ß.1 Sloane 8615 VITREOUS RESISTORS FOR EVERY PURPOSE BY PAINTON e CO LTD KII'GSTHORPE NORTHAMPTON www.americanradiohistory.com December, 1947 Wireless World Advertisements 3 A Spire fitting never leaves go! To tell the truth there's a bit of artist's licence about our illustration. But it is certainly a fact that if you use Spire for your assembly fixings, they have as much hope of coming adrift as the early worm has of escaping the bird. Much less in fact. For the slim Spire fixing depends, not on weight of metal but on a unique double- spring locking action. Spire fixings are easier and quicker to assemble, hold tighter when they're on ; and yet they are quite easy to dismantle even after long periods. Sounds a big claim ? We're quite ready to prove it. * A BETTER way of fixing 1 (Read.)N _- ';- A Spire Fix - the simplest, quickest, firmest and most tolerant form of light assembly. The illustration shows our Spire Fix No. FR337 suitable for use with 1" diameter studs. THAT'S Fixed THAT! SIMMONDS AEROCESSORIES LIMITED TREFOREST GLAMORGAN www.americanradiohistory.com 4 Advertisements rYirelrsc 'onId I)e1-euticr, T947 xx x4rk. A new departure 2)114-ete.:644:6n, in OSCILLOSCOPE DESIGN The L.A.L. UNIT OSCILLOSCOPE presents an . entirely original approach to problems confronting the research engineer and industrial user. Constructed on the Unit principle, we can supply apparatus for every need from D.C. to radio frequencies. Built-in multiple plugs and sockets with mechanical couplers instantaneously complete all electrical circuits and secure a number of Units into a rigid assembly without the use of tools. We suggest the following representative Units for general investigation. Type 15. C.R.T. unit 6" tube and self- contained shift supplies. Type 84. Time Base ; 5- 200,000 cps. with sweep expansion ; automatic synchronizing ; push -pull deflection ; single or triggered sweep. Type 84Y. Amplifier ; gain 25 (cathode follower input) or 600 ; response level I db 10- IOO,000cps., useful at 0.5 Mc. ; push -pull deflection. Also available :- D.C. amplifiers, medium and high gain. Extra low The following area Distributors MIDLANDS frequency time base. Circular or spiral heptode for U.I.C. Silvered Mica and Gothic Electrical Supplies Limited, time base. Voltage calibrator. Ceramic Capacitors, have now 23 -25, Constitution Hill, been appointed to he re- Birmingham 19. quirements of Retailers, Whole- salers and Service Engineers. Fully described in our illustrated leaflets ; EAST ANGLIA Flinders be by of post. NORTHERN IRELAND (Wholesale) Limited, your copies will sent return Eirco Services Limited, 14 -20, St. Peter's Street, Ipswich. 19, Ormeau Avenue, Belfast. LONDON YORKSHIRE & SCOTLAND L.E.S. Distributors Limited, A. C. Farnell Limited, 15 -16, Alfred Place, IS, Park Place, Leeds. Tottenham Court Road, W.C.I. IAL UODUe11bi'cu/e LANCASHIRE & N. CHESHIRE SOUTHERN ENGLAND Hardman & Company Limited, Robshaw Brothers, LYDIATE ASH LABORATORIES The Baum, Yorkshire Street, 10, The Square, Rochdale. Bournemouth. UNITED INSULATOR CO. LTD LYDIATE ASH NR. BROMSGROVE WORCS. Oakcroft Road, Tolworth, Surbiton, Surrey Telephone : Elmbridge 5241 Telegrams : Colonel, Surbiton www.americanradiohistory.com December, 1947 Wireless World Advertisements 5 DERN MASTERS OF REPRODUCTION PRESSURE TYPE DRIVING UNITS EXPONENTIAL HORNS WAFER SPEAKERS AUDITORIUM LOUD SPEAKERS HERE are speakers that go higher and speakers that go lower : other speakers 50% shallower and 40% lighter; a pickup which can repro- duce up to 20,000 c.p.s. ; another pickup giving moving -coil quality with I volt output; public address speakers for all occasions - designed and made by men with eighteen years' practical experience. CABINET LOUD SPEAKERS Write for full technical details -a postcard will do TRU lar O N TRUVOX ENGINEERING CO. LTD., TRUVOX HOUSE, EXHIBITION GROUNDS, WEMBLEY, MIDDLESEX www.americanradiohistory.com h Adz crhsenacnts Wirele ++ World December, 1947 VIBRATORS FOR RELIABLE REPLACEMENTS Tes ted 104. ego a'e4i ?-$.4 6-0 e /op C / Entirely British in design and C construction, and fully approved for O0 th iL Government Service equipment,W.E.Vibrators are ready for all your replacements. They are fitted as standard components by leading radio manufacturers. WIMBLEDON ENGINEERING C 0 . LTD. GARTH ROAD LOWER MORDEN SURREY TELEPHONE : DERWENT 4814, 5010. 117 Mr 41, 1/1WP11% C.R.C.2 YOUR CHOICE for QUALITY Manufacturers of high quality Broad- cast Receivers and Radiograms de- signed for Home and the Export Market. The Export Models have fully tropicalised components, achieving unsurpassed short -wave CHAIRSIDE MODEL A450 performance. The housing of this Receiver is unique in that it is contained in a bevelled plate -glass mirror cabinet, fitted to a wrought iron frame- Special dials supplied for any country work finished in Cream enamel. It embodies all the latest technical developments for easy handling, range and clarity of reception, and provides not a PRICES AND FULL PARTICULARS ON REQUEST only first -class radio but an attractive piece of furni- ture which can replace a Chairside Table and will harmonise with any surroundings. SYMPHONY MODEL A920 This new Receiver embodies the very latest technique in construction. The cabinet is richly veneered in Walnut with a cross banding of Macassar Ebony. Clearly readable edge -lit dial with an 8 in. traverse magic eye and 2 -gear control. Instant, unerring selection of the required frequency range. Automatic volume control and an I.F. trap are incorporated in the circuit. Sockets are provided for gramophone pick -up and extension speaker. ALLANDER INDUSTRIES LTD. ALLANDER 48, Avenue St. Bridgeton, Glasgow, Scotland. www.americanradiohistory.com December, 1947 Wi World Advertisements 7 METALLISED CERAMICS Two new S.P. metallised bushes one at either end of the range For full information and prices please write 0: STEATITE & PORCELAIN PRODUCTS LTD. STOURPORT -ON- SEVERN, WORCS. Telephone: Stourport Ill. Telegrams: Steatain, Stourport. SP.42 www.americanradiohistory.com 8 Advertisements Wireless World December, 1947 The "Connoisseur" is proved by trade tests Exhaustive trade tests have substantiated our claims for the "CONNOISSEUR" pick -up. Below we give the response curve to which every "CONNOISSEUR" pick -up is individually tested. Supplies are very limited but we invite trade enquiries to our dis- tributors who will endeavour to meet your requirements. RESPONSE CURVE (OIIIIO/, Sear PICK -UP 1000 A.F. ATTENUATOR, TYPE I 3 5 8 Frequency Range, zero to 20Kc /s. Input Impedance, 600 ohms. Attenuation, 0 -110 dB in steps of I dB, FREQUENCY ry + I% nominal voltage ratio. LOWER CURVE DIRECT MOM PICK - UP TOP CURVE TRANSFORMER RESISTIVE LOAD SOR 00011 COUPLED I.R ON SEC OF TRANSFORMER Internal Termination of 600 ohms at option. 1. Every " Connoisseur " pick -up is hand Dissipation, 2 tested and passed to ± 2DB of above watts. response curve. 2. Our new type damping material work- ing in gap direct on to armature does not affect bass resonance point. 3. The required downward pressure is 1.1/3 ozs. which has been ac'Eieved with- out counter -balancing or springs. * DIODE VOLTMETER, 4. Being a constant velocity device Bass compensation is required in the amp- TYPE 281 lifier and alternation of high fre- 0.1 -150 volts, 50 quencies to suit individual recordings. c /s. to 250 Mc /s. 5. Output direct from pickup .1 volt. ± 2% of F.S.D. Stable zero setting. Alternative With transformer coupled .5 volt. model having additional d.c. voltage ranges available. " . ..R f' :. / ._' w 00, :' .. S F,it,l4 , ..,I.,R., NOR,TOR;L!. llE * HIGH DISSIPATION RESISTANCE BOX, TYPE 1752 0-I meg. in 5 decades. 6 watts per resistor, 60 watts per decade, except last decade which is 20 watts. Accuracy ± 5 °á. Voltage limit 1,000 volts. PRICES ON APPLICATION Apply to :- Albion Electric Stores, 125, Albion Street, d Leeds 1, or to LABORATORIES LTD. Lawton Brothers (Sales) Ltd., Henry Square, )ueiíi Ashton- -Lyne. under BOREHAM WOOD, HERTS Made by : A. R. SUGDEN AND CO. TELEPHONE. ELSTREE 1 177 (ENGINEERS) LTD., BRIGHOUSE, YORKS.
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