Western electric 120 a schematic

Page 1

Wmmflecnic Company
No. I ZO-A AMPLIFIER

COMMERCIAL PRODUCTS NO I- 54
APPARATUS REFERENCE SHEET AMPLIFIER
IZOA
I - 4 -40

GENERAL
A 2-SIIAGE, LOW-LEVEL AMPLIFIER DITENDED FOR USE AS
_A PIKE-MIXING 0R BOOST AMPLIFIER DI SOUND SYS'I'KLS 0R
SPEECH INPUT EQUIPIEK'IS. 1m: APPARATUS XS MOUNTED OBI
BOTH SIDES OF A FLANGE) PANEL HUG MAY BE FASTEIBD TO
A RBI. RACK IIOUNIING PLATE. 3'

5

ELECTRICAL CHARACTERISTICS
. APPROXIIAI'ELY 40 DB.

GAE .
I. 30, 250 cm 600 OELS.

OPERATES mom.
INTERNAL INPUT IIEPEDANCB.. m cxIIcm-I.
OPERATES INTO... 600 can LoAn.
INTERNAL OUTPUT IIIPKIIAACII. APPROX. soo Imus.
OUTPUT POWER .............. APPROX. .038 um (416 na)
I175 11 TOTAL moms DIS-
NRTIIN.
ou'IPII-I NOISE......H...... -az ma UancrI'raII' :
-67 DB VIII-I'm" I . /
(REL - .001 WATT) fig;
FREQJKNCY CHARACTERISTch snx wan. 5
POI-ZR suPPu.. . PILAIIEN'I - 5.3 v., I m.
PLATE - 275 v., 7 ILA.
(PILAIEN-r AND PLATE SUPPLY
In! BE OBTAINED ram 18A
momma).
W
1 - II. x. 34 AND 1 - l. n. 348A VAchII wars on 2 - _
50
Tm 611G VACUUM TUBES DISTORTlolg'CHARACTERIS'IIC
EQUIPMENT CHARACTERISTICS . 120A wrung:
PANEL 5123.. ....An=nox. 5-1/4- x Io-I/u. m AP- , ,
PARA'IUS EH'ENDS mm. 4-1/2" .\'
non TH! men ANII 2- non THE 2
REAR OF m PANEL.
EIGHT... .. ARROI. 6-1/2 LBS. E,
MOUNTING. . mchxn mm MOUNTING on A 1va m I;
Immc PLATE. ruxmu mean ,9
Mommas AR! mmmm). mm g
IzoA AMPLIFIERS IMY BI: mum oN
ONE PLATE, REQUIRING 10-15/32' or ;
RELAY RACK SPACE. g
HNISH ............. BRIGHT ALUMINUM LACQDER 0N zmc- ;
PLATED 51m. A
<
mm 53
(J-675286.. .Assxuau ANII s'wcx LIST
BSD-675287.. ..scumnc DumAIA ,.
.IIRING Imam H a ,2 I5 20-"?
.I'E'HIIG DIMRIM'IION OUTPUT POWER LEVEL IN 03

(REF r _oaI WAYT)

z
2 GAIN FREQUENCY CHARACTERISTIC 0F IZOA AMF!
3
u

I I . l . ' - 5; I ' ' ' ',_'_ ' ' ' " "5.. FOR WIRING DIAGRAM AND SCHEMATIC
nunuchv IN cchzs PIN can: 3:: REAR OF THIS smr