Western electric 376 b brochure

Page 1

BELL SYSTEM PRACTICES ABH6.376B
Transmission Engineering and Data Issue h, April 1956
Electron Tube Data A.T.&T. Co. Standard

ELECTRON TUBE DATA SHEET
WESTERN ELECTRIC 37GB ELECTRON TUBE

DESCRIPTION

The 376B is a three-electrode, inert-gas-filled, cold cathode tube for use
in relay, voltage regulator or rectifier circuits. This tube is especially
suitable for use in control circuits such as in triggering, counting, or
switching apparatus requiring a high current rated tube.

MAXIMUM RATINGS

Peak Anode Voltage ........... . . . . ---- 275 volts
Average Cathode Current . . . . . . . . . . . . 20 200 milliamperes
Average Life, Approximate ..... . . . . . . 10000 10 hours

File: Cold Cathode Section
Issue 5, April 1956

3763

Page 2

316B - Page 2
MAXDM-i RATHiGS, Absolute Values
Inverse Peak Anode Voltage . . . . . . . . . . . 200 volts

Forward Peak Anode Voltage . . . . . . . . . . . 275 volts
Forward Cathode Current A. . . . . . . . . . . .
Peak.. 200milliamperes
Average................... 70milliamperes
Averaging Time . . . . . . . . . . . . . 2 seconds
Inverse Peak Anode Current 1 . . . . . . . . . . 5 milliamperes
Peak Starter Current
Forward . . . . . . . . . . . . . . . . . . . 100 milliamperes
Inverse................... lmilliampere
Ambient Temperature Limits . . . . . . . . . . . -55 to +83 :entigrade

E LEC'LRICAL DATA, Throughout Life
Min. Bogey Max.

Starter Breakdown Voltage . . . . . . . . . . . 67 75 85*volts
Starter Voltage Drop at 20 Inuiamperes . . . . 52 60 71+ volts
Anode Voltage Drop at 30 !-' :1:11_ amperes . . . . . 60 70 80 volts
Transfer-Current..... .........Seecurve-Fig.3

Ionization Time, Starter Gap2 . . . . . . . . --- 2 --- milliseconds
Deionizaticn Time, Main C-ap, Approximate . . . --- 3 --- millisecoms
RECEANICAL DATA
McmtirgPosition.......................Any .
\Ie:.§e:ght,Aproximate.................... lounce
Dimensions and pin connections shown in outline drawing Page A

* Limit applies immediately after Lube has conducted current. 1f tube
as beer. idle, this value initially may be as mch as 3 volts higher
or lower.

ate 1: Sufficient resistance must be used in series with the tube to assure
that the electrode currents do not exceed their maximum rated values.

Note 2: With 15 volts starter overvoltage (15 volts above Starter Breakdown
Voltage) with tube in total darkness.

HANDLEG
Western Electric cold cathode tubes contain a minute amount of radium bromide

wt: is a radios: ive material. The anoint in most types is too well to require
any special care in use, handling or 6115130531. '

-,.

A few types contain a larger quantity of radium bromide in which the radium
apgroximates that found or. a luminous watch dial. These types bear a red three-
bladed promfler- shaped symbol on the tube envelope. Instructions for handling
5 2 tubes are given below and also in Bell System Practices for Central Office

re_ntenance .

Installations ordinarily require no precautions against radiation. However,
quantities 01 the tunes should not be so installed, or so stored outside the
s ping canton, that their will be within a few inches of personnel or in proxi-
_. y to photcgaphic film Ior extended periods of time. For example, however, a
lie-hour week exposure at about one (1) foot from a bank of 500 tubes (covering
an area of 20 inches x ks inches) is well within the accepted tolerance limits
for personnel. Reasonable care should be exercised in handling and disposal of
broken tubes. In general, attention should be given to the following:

(3) Avoid breathing dust or vapors from broken tubes.

('0) Avoid contacting broken parts with bare hands.

(c) Use wet rag to pick up broken parts. Wrap broken parts in rag and tie
securely so as to form a package. Thoroughly wash hands after disposal.

(d) Dispose of broken or defective tubes as they are taken out oz" service.
One or two tubes at a ti_'e may be disposed of with normal waste material
Accmmllation of tubes in one concentrated area of the place 01" final
disposition should be avoided.