TypeAmplifiers

IDEALL Y SUITED as a main amplifier in either AM or FM audio system instal-lations, Western Electric 132 type Amplifiers have a number of features which willhelp give the modern broadcaster high-quality, dependable service.

Compact physical dimensions - low signal-to-noise ratio - gain and outputcapable of providing a suitable margin above line level to allow for losses in linecoupling devices - stabilized feedback to maintain fidelity over the full 50 to 15,000cycle range - these are some of the outstanding qualities found in Western Electric132 type Amplifiers. The components are fully shielded to minimize the effect ofself-generated noise. Resistors in the cathode circuit are provided to permit tubechecks. As well as being able to feed program lines, the 132 type can also be usedto supply many program bus systems or studio auditioning facilities or master switch-ing circuits. The 132 type operates from an external power supply, and is suitedfor either desk or rack mounting.

The 132 type Amplifiers are available as the 132A or 132B, which are similarex t for the input circuit and overall gain. The input transformer of the 132Amay be connected only to unbalanced.to-ground circuits, and has input impedanceconnections for 30/50, 150/250, or 500/600 ohms. The 132B may be connectedto either balanced or unbalanced-to-ground circuits, and has input impedance con-nections for 30/50 or 150/250 ohms. The 132A has an overall gain of 48 db, andthe 132B has an overall gain of 51 db. * On the 132B the center-tapped inputtransformer is provided with an electro-static shield. It also has an extra electro-magnetic shield to reduce hum pickup from a-c magnetic fields which may existfrom other apparatus.

• For Modern FM and AM Broadcasting

• Can supply program lines or program

bus systems and studio auditioning

facilities

• High signal-to-noise ratio

• Stabilized feedback

• Easy checking of tubes

• Compact

Typical Specifications,PLATE: 275 volts,FREQUENCY RESPONSE (as measured

from nominal impedances) : Uniform within-I- 1 db, 50 to 15,000 cycles.

OUTPUT NOISE: 132A -65 dbm132B -64 dbm

SIGNAL· TO·NOISE RATIO (+ 18 dbm out) :132A 83 db132B 82 db

SOURCE IMPEDANCE: Nominal 30/50 or150/250 (or 500/600, 132A only) ohms-matching. For bridging, add suitable inputpad.

LOAD IMPEDANCE: 600 ohms.

*MAXIMUM GAIN: 132A 48 db132B 51 dh

OUTPUT POWER: + 28 dbill, with 1% totalharmonic distortion.

POWER SUPPLY: Filament 6.3 volts, 1.5amperes a-c or doc.

VACUUM TUBES:Quan. WesternReq'd. Electric1 348-A1 349-A

CommercialReceiver Type617 or 16206F6

MOUNTING: Designed for console mount-ing, also for rack mounting through the useof 177, 190 or 206A type Mounting Plate(Capacity 3, 132 type Amplifiers per plate).A 406A type Panel (face mat) is requiredfor each mounting plate.

DIMENSIONS: 10%" wide, 5%" deep, 7"high overall.

':'60 db maximum gain is available in the 132B Amplifier by ehanging eertain resistors. For this condition, how-ever. the output noise be.'omes -- 58 dbm '+18 dbm out) and output power + 24 dbm for 10/0 distortion,

• KS-I0003 Meter for measuring platl:' ('UI'-

rents of the vacuum tubes.

• Wl:'~ternEleelri(' ]90 or 206A tvpe Mount-

ing plate.

• Western Electric 406A type Panel.

Western Electric reserves the right. without notice, to make

such changes in equipment, design, or components as prog-

ress in engineering or manufacturing methods may warrant.

Gray15aRELECTRIC COMPANY

ALABAMA GEOl{GIA MICHJGAN NO. CAHOLINA SO. CAROLINABirmingham Atlanta Dctroit Asheville Columbia

ARIZONA Savannab Flint CharlolleGrand Rapids Durham TENNESSEE

Phoenix IDAHO ChattanoogaBoise Lansjnl! Winston·SalemARKANSAS MINNESOTA KnoxvilleLillie Rock ILLI JOIS Dululh OHIO Memphis

Chicago Minneapolis Akron NashvilleCALIFORNIA PeoriaFresno SI. Paul Cincinnati TEXASLos Angeles INDIANA MISSISSI PPI Cleveland AmarilloEvans,-ille ColumbusOakland Hallllllond Jackson Dayton BeaumontSacramento Indianapolis l\uSSOUlU Toledo Corpns ChristiSan Diego Kansas City Youngstown DallasSan Francisco IOWA SI. LOllis Fort Worth

Davenport MONTANA OKLAHOMA HoustonCOLORADO Des Moines Bulle Oklahoma City San AntonioDenver KANSAS

Wichila EBRASKA Tulsa UTAHCONNECTICUT Omaha Salt Lake CityHartford KE"TUCKY NEW HAJ\IPSHIRE OB,EGONew Haven Louisville l\lanchesler Eugene VIRGINIA

DELAWARE LOUlSrANA NEW JEHSEYPortland Norfolk

Wilmington New Orleans Newark PENNSYL VANIA HichmondMAINE Roanoke

DIST. OF COLUMllIA Portland NEW YOBK Allentown\Vasl,ingloll Alban\' Harrisburg WASHINGTONMAHYLAND Bingh~lIJton* Philadelphia Seattle

FLORIDA Baltimorf" Buffa 10 Pillsburgh SpokaneJacksonville MASS-\(:lI USEITS New York Reading TaconHIMiami Boston RochesterOrlando Springfield Syracuse BI-lODE ISLAND WISCONSINTampa Worcester Utica* Providence Milwaukee

":;ulea Uffice A NATIONAl. ELE<.:TRIC SERV I<.:E

Norf!J~rl1E/~clrjcCOMPANY LIMITED

General Offices: 1620 Notre Dame Street, W.

Plant: 1261 Shearer Street,Montreal. P. Q., Canada

TWENTY.~IX OFfICE~ ACROSS CANADA

H1!siern Electric Company