7412533199

HIT THE TOP IN

WOnL

BIG OPPORTUNITIES are waittng for rht man who masrers relevision theory. design, transmtssion. Now. this complete 2..100 page libr ary tellt you everything you mutr know to succeed in rhit profitab!e. fast-growing field

THE McGRAW-HILL

Practical

Television

ENGINEERING LIBRARY

Pour Giant Volumes, With Morm Thcm 1,600 lUuitrotionf.

FREE

$9.50 book

Wentworth't

COLOR TV ENGINEERING V a I u i b t e handbook will be aent at no rstra colt Co ve ra color from A to Zl

10 OATS

FREE

TRIAl

'Phi* complete technicnl library c«n help you In-comi* nn •xp«rt in *ervtcinj(, enginecrinK reacArrh. nrcult (Irsiicn. or TV t ranem iaalon. Leadinff rnionrere cxpUin ■ aim-ply and clearly — cv»rythlng from ha«lc (hrory to ndsancrd Circuit dmiftn. 2.300 luiffea and I.GOO illuntratłona ihow you tli* nruwrn to your qurMion*. *civc you tlić practical worki nu knowledjce you necd to Ret ahead in TV. The coupon helów will hrlnR you all four v(ilumn for free ten duy trlal. Mail it todayf

• Ttlevition Fundamenta!*. Ity K. Fowler and II. Mppcrt of lim* eral Klecirlc.

• Taltvliion EntinMhnf. Ity ]>. Flak. 1'hllco t*ori».

• Th tory and Ottifn of T«ltviiion Rtttitart. Ity S. Drutach. l^łoly-technlral Ite^etnh an«l Ik-rrl. Fo.

• Color Talaelsion Standard*. Ity I). Klnk. ritllro Porp.

McGrow-Hill Book Co. I

Dept. ELW-10

327 Wofł 41sł St., Now York 36. N. Y.

Send the «l-volume Practical TeKovlalon Knti- I nerrina Library plua Color Toloclainn Kngineer- i ino for FKKK BXAMINATION. I will aend $10 I within 10 daya and only $0 monthly untll Iow price of $3A ia paid. Otherwlae I will return all 5 book a poatpaid and owe nntliinff.

Name ..... |

Addreaa ............................. |

City...............Zonę • . . State....... |

Kmployed by....................ELW-10 |

CLASS "D" CITIZEN BAND

CRYSTALS

“Empire 88” Stereo Cartridge

|T is quite obvious within the trade Ithat the industry is going through its second round as far as stereo car-tridges are concerned. Many compa-nies are coming out with new designs or revised versions. resulting in much better performance than obtained in the early stages of stereo disc re-production.

A company that is new in the field of high-fldelity, Audio Empire, a division tridges on the market today. Many

of Dyna-Empire Inc., has just an- early cartridges had a channel separa-nounced its entry into the stereo-car- tion starting between 15 and 20 db at tridge field. Other high-fidclity prod- 1000 cps and then gradually diminish-ucts are in the design stage but any ing until, in many cases. no separation

further comment on this will have to would be obtained in the neighborhood

await another day. of 12.000 cps. Channel separation is an

Its new cartridge, known as the important factor in obtaining good au-“Empire 88". is of the moving-magnet dio separation in the finał output and, type and is designed to be used with although there are no specific stand-either record players or turntables. ards within the industry. we would Plans are to market this unit in var- like to see at least 15 db maintained ious stylus radii with either diamond as far out in freąuency as possible. The

or sapphire tip. The one we checked stereo illusion is obtained mainly from

was the Model S88-7RD which has a signals in the mid- and high-frequency

.7 mil diamond stylus. end of the audio rangę. It is wcll

The frequency response and channel known that the very Iow frequencies

separation for the left channel are contribute littlc to this illusion. shown in the curves. It is quite obvious The compliance of the cartridge is that the results are most gratifying rated by the manufacturer as 5 x 10“*

in that frequency response was within cm./dyne both vertically and laterally.

± 2.6 db from 30 to 15.000 cps without The dynamie mass is rated as .7 milli-

abnormal pcaks or dips. The channel grams at 1000 cps. According to the

separation warrants special comment. manufacturer, this gradually decreases

being 19.8 db at 1000 cps and main- as frequency inereases. bcing practical-

taining good separation to 10,000 cps. ly zero at 15.000 cps. With this type

This performance is exceptionally good of characteristic there should be little

when compared with many other car- record wcar at the extreme high end.

TEXAS

HceAi

Jrd Dvertone; Mermeticalty Seated OOSH tolerance—Meet W CC reduire. manta, t/a“ pin • pac 1*9—.050 pin diam-•tera. (.Ok3 pina *vail-

® — *»• "^{r ł,y}* $^95

22 CHANNCLS ^Ccach

(add 5c per cryaUl for po*Uge and handlino)

poiUgt and

Th. following Clait •'D" Citii.n Band fre-qu.nci.t in itock (fr.qu.nci.t liłt.d in maga* cycl.t): 26.T6S, 24.t75, 26 ?85. 27.005. 27.015.

27.025. 27.035. 27.055. 27.04S. 27.075. 27.005.

27.105, 27.115. 27.125. 27.I3S. 27.155. 27.145.

27.175. 27.185. 27.205. 27.215, 27.225.

RADIO CONTROL CRYSTALS

in HC6/U HOLDERS—SIX FREpUENCIES

In a lock for tmmwJIM* <lelivery . frc«iuc.»r ica lUted In ntcirary^rle»»: lol_rranee .<M>.*V<V_r# 14 - pin apaclnp. .OSO pin dlaineler. C.O»:i i*tn* avaiUi»lc. a<l«J I3C per crya-lal.l S|Hrrify frciucory dealrcd.

26.ff5, 27.045. 27.015. 27.145, 5^95

27.115, 27.255 .................. A«a_Ch

l»« Sc per crytUI tar pociąg* and hindlln«|

Send for FREE CRYSTAL CATALOC WITH OSCILLATOR CIRCUITS

ASK YOUR PARTS 0EALER FOR TEXAS CRYSTALS

t*ee klf red UUplay . . . |f he «luoer»'l stork thcm. I Mrnd ue hia name and ort Jer direet from ncarrai I tortury.

Fr*qu«ncy response and channel separation characteristics with left channel input. Channel separation below 1000 cps is not shown as it is not measurabie when using the Westrex 1-A test record. Channel separat:on below 1C00 os presents no problems sińce high separation at the Tery Iow lrequencies is not required as these (requencies do not contribute much to the stereo illusion. The right channel performance for both frequency response and channel separation was quite similar to that of the left channel and thereiore was omitted from the graph. The left channel had an output of 5.6 m▼. while the right channel had 6.0 mr. output on a 1000-cps signal at a recorded relocity of 5 cm./sec. AU tests were madę using 3.5 grams pressure. which we found prorided the best performance for our particuiar equipment. According to the manufacturer. this pressure could be inereased to 8 grams. which may be required for some of the older types of record changers. We found no hum probiems. The results of our tests regarding hum are about the same as other cartridges we hare checked.