Western electric 413 a brochure

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BELL SYSTEM PRACTICES A3346 .h13A
Transmission Engineering and Data Issue 2, April 1956
Electron Tube Data A.T:&T. Co. Standard

ELECTRON TUBE DATA SHEET
WESTERN ELECTRIC 4|3A ELECTRONTUBE

DESCRIPTION

The h13A is a two-electrode inert-gas-filled cold cathode tube having a high
current rating. In addition to its initial field of use in telephone message
register circuits it is especially suitable also for use in control circuits such
as in switching or pulse counting apparatus.

MAXIMUM RATINGS

Forward or Inverse Average Cathode Current . . . . 20 200 milliamperes
Average Life, Approximate. ..... . . . . . . . 10000 10 hours

File: Cold Cathode Section
Issue 2, April 1956

4|3A

Page 2

24L13A - Page 2
MAXIMUM RATIEGS, Absolute Values
_________________________________

Cathode Current -

Peak, Forward or Inverse . . . . . . . . . . . . 200 miflianperes

Average, Forward or Inverse . . . . . . . . . . 7O milliamperes

Averaging Time . . . . . . . . . . . . . . . . 2 seconds
Ambient Temperature Limits . . . . . . . . . . . . -55 to +35 centigrade

ALEC'IRIC AL DATA, Throughout Life

Min . Bogey Max .

Anode Breakdown Voltage

Forward . . . . . . . . . . . . . . . . . . 180 200 255 volts
Inverse . . . . . . . . . . - . . . l 200 --- volts
.'-.node Voltage Drop, Forward or Inverse . . . . 55 62 75 volts

Ionizationlime...............-- l
Deionization Time, Approximate . . . . . . . . --- 2

)wECI-IANICAL DATA

HountingPOsition.................. Any
Kat Weight, Approximate . . . . . . . . . . . . . . . 1.2 ounces
Dimensions and pin connections shown in outline drawing on page

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

Note 2: With 15 volts overvoltsge (15 volts above anode breakdown voltage)
when tube is in total darkness.

HANDLING

Western Electric cold cathode tubes contain a minute amount of radius bromide
which is a radioactive material. The amount in most types is too man to require
any special care in use, handling or disposal.

A few types contain a Larger quantity of radimn bromide in which the radium
approximates that found on a luminous watch dial. These types bear 9. red three-
bladed propeller-shaped symbol on the tube envelope. Instructions for handling
such tubes are given below and also in Bell System Practices for Central Office
maintenance.

Installations ordinarily require no precautions against radiation. However,
ies of the tubes should not be so installed, or so stored outside the

ing carton, that they will be within a few inches of personnel or in proxi-
~ _ty to photogra: tic film for extended periods 0: time. For exacple, however, a
40-hour week exposure at about one (1) loot from a bank of 500 tubes (covering
an area of 2-3 inches x 1+5 inches) is well within the accepted tolerance limits
for personnel. Reasomble care should be exercised in handling and disposal of
broken tubes. In general, ttention should be given to the following:

(3) Avoid breathing dust or vapors from broken tubes.
(1:) 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 pacme. Thoroughly wash hands after disposal.

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