electronic crossover audio amplifier - AmericanRadioHistory.Com

154 Pages·2014·16.42 MB·English

ELECTRONIC CROSSOVER AUDIO AMPLIFIER
Radio-Electronics
95
TELEVISION SERVICING HIGH FIDELITY
HUGO GERINSBACK, Editor
Transistor shortwave
Superregen Works
Past 30 NC!
An Easy- to-Build
Low-Cost Amplifier
Customers We Could
Do Without!
Transistors Power
101eter Transmitter
Prefinished Kits
Aid
Audio Builders
1
(See page :8)
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Career
For a Successful
in Radio -Television
Train at Home
in Spare Time
with
N. R. I.
OLDEST
and
LARGEST
Home Study Radio -Television School
Prosperous Fast Growing Industry Offers You
.R.I. Trained These Men
GOOD PAY - BRIGHT FUTURE - SUCCESS
ENGINEER STATION WHPE
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can train at home for Radio -Television. and your head. You get dependable training,
backed up by the reputation of the oldest and
QUKK SPARE TIME CASH 1ODAY'S OPPORTUNITY FIELD largest home study Radio -TV school.
"Knew nothing about Radio- TV
when I enrolled. After 15 lessons Training PLUS OPPORTUNITY is the ideal ADD TO YOUR INCOME SOON
started repairing sets. My future combination for success. And today's OPPOR-
looks bright." DONALD B. TUNITY he d is Radio-Television. Over 125 $10 -$15 A WEEK IN SPARE TIME
ACKERMAN, MINNEAPOLIS, million hone Radios plus 30 million sets in Soon after enrolling many start earning extra
MINNESOTA cars, plus 40 million TV sets mean big money money fixing sets. Many open their own full
for trained Technicians. More than 4,000 Radio time Radio-TV shops after getting NRI Di-
"wrKiQgoLhurIHktiN tA ffESuimnl, l a OytCni mcWI¿iNaeoNl.bC l yII .TtN"loo VN v WdeABo UiI TtLS ITaLI.Nn eIlOdAEe SvHMdSioIs Oi aoF lnl. aaayobnneulddate raiTTsmb-VVoNpu obstRre rtNtoaIsa n,R dhtH Ica.pias -o sSFbtsiiiienn,t eicgoane sn sss1ttur.a9 art1Ceii4on of -nilunofstgro u otrraefe fml meegrvbr oioiirstnweiioot tetnuhhr,s.e a psFnmto iinnr4etdg0n- pLmtAileedoessdnms rtoi eanns.s su:MpaR npNaAlddAi IeiToLd6 I-, 4O T C-opVNOuaA.gt UlLeiPnP rReOiCcsA NeaDo t.afI iO lsGoc goIelNu ot rwSssFhT e-RostIT,ewE UroiEmTnp gEpsS ,o eaDrqmetuueapisnpplyiet--..
7EF, Washington 9, D. C.
You Learn Servicing -Broadcasting FREE
at Home -By Practicing SAMPLE LESSON
with Kits N.R.I. Sends AND CATALOG
Nothing takes the place of
practical experience. That's
why NRI training is Learning. National Radio Institute
by- Doing. With Servicing Dept. 7EF, Washington 9, D. C.
Course you build Radio shown
at top and other equipment Mail nie *ample Lesson and 64 -Page Catalog
With Communications Course FREE. ,alesman will call. Please write plainly.
you build Transmütters at Wt
ashnodw ost haellr eeqquuiippmmeenntt . yCoaut aglloegt Name_ Age_ _ _
Available To Address_
VETERANS
(' y Zone___State_
-
Under G.I. Bills ACCREDITED MEMBER, NATIONAL HOME STUDY COUNCIL
MAY, 1057 3
www.americanradiohistory.com
MAY, 1957
Radio -Electronics
I
Formerly RADIO CRAFT Incorporating SHORT WAVE (RAFT TELEVISION NEWS RADIO & TELEVISION'
EDITORIAL
33 U. S. Government Needs Inventions -Hugo Gernsback ON THE COVER
AUDIO -HIGH FIDELITY
34 Low -Cost Remote Amplifier- Roland Jordan, Jr.
36 Modern Phonograph Cartridges, Part II- Julian Hirsch
38 Enclosure Kits Aid Audio Builders (Cover Feature) -Eric Leslie Typical hi -fi enthusiast Carol
40 Electronic Crossover Amplifier- George L. Augspurger Hughes of New York City
42 Too Well Checked -Monroe Corn prepares to install the
43 The Last Link -Norman Crowhurst speaker in a Cabinart pre-
finished enclosure kit.
44 Negative Feedback Controls Selectivity
45 Can Cheap Speakers Be Improved ? -A. L. George
131 New Records
WHAT'S NEW Color original
by Gary Wagner Studio
47 Pictorial Report of New Developments
TEST INSTRUMENTS
48 Two New TV Testers -Robert F. Scott
51 Capacitor Checker- Joseph Cozzo
52 A Scope Switch -Richard Graham
RADIO
54 Electronic Texas Towers -Col. Nelson S. Brooks
56 Electronic Crossword Puzzle -Charles Henry
VI 57 30 -Mc Transistor Superregen -Edwin Bohr
59 Misleading Heater String -V. F. Woychoski
60 Transistorized Rig Works 10 -Meter Dx- Richard S. Griffith, W7MPQ Hugo Gernsback
Editor and Publisher
ELECTRONICS
M. Harvey Gernsback
Editorial Director
62 Light Meter for Electronic Flash -Guy Slaughter Fred Shunaman
Managing Editor
78 Electronics Times Traffic Signals -Leo G. Sands
Robert F. Scott
81 How Electronics Controls Humidity- Thomas L. Bartholomew ._..W2PWG, Technical Editor
1. Queen
TELEVISION Editorial Associate
Matthew Mandl
86 Rhomboids for TV Reception -H. W. Kline Television Consultant
Elizabeth Stalcup
94 Locating Intermittents -Paul Boller Production Manager
98 Customers We Could Do Without -Art Margolis Angie Pascale
Editorial Production
106 TV Service Clinic -Conducted by Jerry Kass Wm. Lyon McLaughlin
11I TVDX- Robert B. Cooper Jr. ....Tech, Illustration Director
Sol Ehrlich
Art Director
145 Books 113 Patents Lee Robinson
Generavotanager
140 Business and People 126 Question Box John J. Lamson
139 Corrections 134 Radio- Electronic Sales Manager
18 Correspondence Circuits G. Aqua Circulation Manager
116 New Devices 143 Technical Literature Adam J. Smith
....Director, Newsstand Sales
8 News Briefs 123 Technicians' News Robert Fallath
Promotion Manager
121 New Tubes and 129 Technotes
Semiconductors 137 Try This One
NEXT MONTH: HOME CONSTRUCTED AUTOMATIC SHUTOFF FOR YOUR RECORD PLAYER
EASILY BUILT COLOR SUBCARRIER SIGNAL GENERATOR
Associate Member Institute of High Fidelity Mfrs.. Inc.
aSfSRotUU rA MBBDoStSI.nO CCe MR-RyEIIoePLPraErTTriC;IsI OO,T $NNRI8l .SOl0.R: 0N ACICfATooSdrpE d,yS rtrew:i MgsohsUa t. yy c,1eo S9ar5.rr1,e7s 9 ;s5 Upb7.$oy, 1n 0SdGV..e5 eon0rlp cn. oesfosb sXrat eocXs tksh RViroePanIeIdus Ii b.o ayl-ine cNEdaarol tes.i. cCo tnar5Ason .nla lPid cIuaonsb,,tc hl. i$eSs4rhuA .0eblc0lds o c rurfiminogptrhotr itinoseot nsnh rele y$Ds5 yee.re0pava0tter .d,: a M $4ut1y7.n4 .e0d a0eMrN r;.o f orU$rWr9i ns.t0ei,wv 0sleo eIr lyfsloy. a.rel A,a trvbwsIey;no. ,t eG$yD9reen.i0rtaan.0r ts sibMo;f aonoc$ra k1rlr2t ih.sa0Pr,n0 eu edIb flollyiP.cr , a aanttorhi so-rr ;Ane 1esms5 ,i4 ney grIeiWlncaecar es.n sc. to SpCe1ioec4psot hyn 3rdi5-Sgc cht,.l ta, .P< CsaN onen wn-v Aa eimnYlt oeiorrpkinrc isav.1 ni1l e, gceoNsu. natYruie.t hs oW$ri4hz.ee5nd0
requesting a change of address, please furnish an address label from a recent issue. Allow one month for change of address.
GChEaRirNmSaBnA oCf Kth eP UIlBoaLrIdC;A MT.I OHNaSrv. eyIN GCe. rnEsbxaeccku,t ivPer eEsiddietonrti;a lG .a nAdl ipuAod,v eSrteiscirnegta ryO.f fices, 154 West 14th St., New York 11. N. Y. Telephone Algonquin 5 -7755. Hugo Gernsback.
BRANCH ADVERTISING OFFICES and FOREIGN AGENTS listed on page 149.
POSTMASTER: If undeliverable, send Form 3578 to: RADIO -ELECTRONICS, 154 West 14th St., New York 11. N. Y. 'Trademark registered U. S. Pat. Office.
4 RADIO -ELECTRONICS
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"''Blue
Chip
Views
Quality ek Briefs
TACAN DATA LINK, latest contri- the ground controller to indicate on the
bution to air safety, may be a major instruments in the plane what speed,
step to an air -traffic control system able height, rate of descent and direction to
to handle not only present high -speed fly.
aircraft but also the coming traffic
problems of the jet age.
Tacan and its commercial counterpart RADIATION INTERFERENCE by TV
Vortac give the pilot accurate informa- receivers above 260 me will now have
tion on his bearing and distance from to meet FCC requirements on all uhf
the station, but do not solve the prob- TV chassis placed in production by
lems faced by the ground controller at June 30, 1957, and all TV receivers
ITS Tung -Sol aepa nxladabnc uets hsy- ep aaodassiiin rtpigwoo -enral tl .to a fs H theath e esliahrsr oagmauell edti tnutukidmnmeoe,bw ,e s rp aetnheodedf cmrooevpamenrrpe utlsfhieaaennc tctosue r riegdawi n iaath6lf t-demarr oeteDngstue hclt .ah te3ipo 1oFn, sCst1 pC9o5l ni7sme.e mtiT teifhnonigtsr
the radiation of TV receivers. After
be able to give directions to them almost
simultaneously. the new dates, all receivers will require
Added to the Vortac or Tacan sys- certification that their radiation does
not exceed the legal limits.
tem, the Data Link originates informa-
tion which rides "piggyback" on the Postponement was requested by
Tacan transmission. Henri G. Bu- Rtuardeiros - EAlsescotrcoiantiicosn-. T elevision Manufac-
signies, president of Federal Commu-
nications Laboratories, in a recent in-
troduction of the equipment, explained TRANS- ATLANTIC SCATTER plan
that these transmissions can supply full of an ionospheric scatter system for
data on identification, speed, course, fixed trans -Atlantic communications
altitude and position every 6 seconds. was adopted in Montreal, Canada.
The ground station can issue instruc- The Council of the International Civil
tions covering all these by simply press- Aviation Organization approved a pro-
ing buttons which cause the orders posal by the United States to form a
to appear on the face of the correspond- forward propagation system between
ing meters in the aircraft. In addition, Canada, Iceland, Greenland, Ireland
a "library" of 31 messages can be and England. (See "Over- the -Horizon
Tung -Sol receiving tubes for TV, radio transmitted and, due to the nature of Radio Presages World Television,"
atihnnedd e spaHemin -edF iea ns rt tehspoeltsa ecm esamukpeepnrslti. edaT hrteios olenexaead cfitinnlgye tpphlraeeTn sheeeeq n utiD nip aVmtthaoee nr Ltta,li acntn khg oeucrya a ngwT eiea lacl osaifanl py t phsseeyua sprtp peiilmnleo mste. a ecbnhyt pRboeAiTtDnwhItOe i-s et- oEn L s-ApyEoCsltaiTensRmtk Oca No wamICnimSdll, uthbnSeeiec pAasttileimeomunibtlsia eahrrn a, svt o1ew 9bh5tehe6era.n)et
quality is your assurance of long, adding a few pieces of equipment and established with Collins transmitters.
trouble -free service that keeps cus- installing meters modified to show or- What type of equipment will be used
tomers with you year after year. Tell ders and include pickups for informa- for the North Atlantic system has not
your supplier you'd rather have tion to be transmitted. been decided. The new system is to be
Tung -Sol Tubes. TUNG -SOL ELECTRIC The Tacan Data Link airborne equip- built at an estimated cost of $5 million
INC., Newark 4, N. J. ment provides a system that permits (Continued on page 12)
OTUNGSOL
MAGIC MIRROR ALUMINIZED
PICTURE TUBES
RECEIVING TUBES
Miniature Seated Beam Signal Radio and
Lamps Headlamps Flashers TV Tubes aras s
RED ATc HOLDING
Tacan Data Link airborne equipment displa-y. ROGER PROCEEDINr
Aluminized Special Sen conductor Mlatetteerr sb yi nsdeiccoanted saectt uoafl naunmd boerrds eorer dw ecdogned-i tsihoanpse d oeOITING Gas Low'
Picture Tubes Purpose Tubes Products indicator at dial edge. Right meter is mode LANDING RADIO pill
(type of ground control) and message indicator.
8 Lower instruments are channel and (air -to-
ground) message selector.
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E
1957
ALLIED RADIO
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¡NI 1Ati3tt 1P4 A5AW1 114111 1957
EON
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send for the leading electronic supply guide ALLIED RADIO CORP., Dept. 2 -E -7
100 N. Western Ave., Chicago 80, III.
(] Send FREE 356 -Page 1957 ALLIED Catalog
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Name
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ALLIED RADIO 1 Address J
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City Zone State
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World's Largest Electronic Supply House ttta t1111 SIM
MAY, 1957 9
www.americanradiohistory.com
the best color TV picture
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the g rowth of I olor TV means an even greater demand for
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2 ab etter picture on more stations
CDR Rotors ach to the pleasure of TV viewing because
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TV si gnal givir g a BETTER picture and making it
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tested and proven dependable
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ff thousands and thousands of CDR Rotors have proven
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el in installations everywhere in the nation. Quality
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TR and 12
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4 pre -sold to your customers
the greatest coverage and concentration of full minute
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5 the complete line
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AR and 2
1
SOUTH PLAINFIELD. N J CLEVELAND 13. OHIO
10 RADIO -ELECTRONICS
www.americanradiohistory.com