Western electric 430 a brochure

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BELL SYSTEM PRACTICES ABh6.h30A
Transmission Engineering and Data Issue 2, April 1956
Electron Tube Data A.T.&T. Co. Standard

ELECTRON TUBE DANA SHEET
WESTERN ELECTRIC 430A ELECTRON TUBE

DESCRIPTION

The h3OA is a three-electrode, inert-gas-filled,cold cathode tube for use in relay,
voltage regulator or rectifier circuits. This tube is mechanically and electrically
identical to the 313C except that it has a much faster starter gap ionization time.
The tube is especially suitable for use in fast switching circuits.

MAXIMUM RATINGS
Peak Anode Voltage . . . . . . . . . . . . . . . . 185 volts

Average Cathode Current . . . . . . . . . . . . . . lO

loo milliamperes
Average Life, Approximate . . . . . .

. 10,000 10 hours

File: Cold Cathode Section
Issue 2, April 1956

430A

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haoA - Page 2
MAXIIIMU'M RATINGS, Absolute Values

Forward Peak Anode Voltage . . . . . . . . . . . . 185 volts
Forward Cathode Wrentl
Peak lOOmilliazzperes
Average . . . . . . . . . . . . . . . . . . . . . 35 mifliamperes
Averaging Time . . . . . . . . . . . . . . . 2 seconds
Inverse Peak Anode Currenti . . . . . . . . . . . . 5 milliamperes
Ambient Temperature Limits . . . . . . . . . . . . -55 to +85 centigrade

ELECTRICAL DAIAz Throughout Life

Starter Breakdown VoltageQ. . . . . . . . . . . . 05 7o 85 Volts
Starter Voltage Drop at 20 Eillianperes . . . . . 52 So 74 volts
Anode Voltage Drop at 20 Millimperes . . . . . . 68 75 85 VOlES
Trans_erCurrent.... Seecurve-Fig.3

Ionization Time, Starter Gep3 . . . . . . . . . . 0.07 0.20 milliseconds
Deionization Time, Approximate

Starter Gap . . . . . . . . . . . . . . . . . . . . . 3 . . . milliseconds
thin Gap . . . . . . . . . . . . . . . . . . . . .. lO . . . milliseconds
Inverse Current at -l20 Volts Anode Potentialh. . . . . . . . 3 millimperes

MECHANICAL DATA

Mounting Position . . . . . . . . . . . . . . . . . . . . . . . . . . . Any
Net Weight, Approximate . . . . . . . . . . . . . . . . . . . . . . . . 1 ounce
Dimensions and. pin connections shown in outline drawing on page )4.

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

Note 2: Limits apply imediately after tube has conducted current. If the tube
has been idle, these values initially nay be as much as 3 volts higher
or lower.

Note 5: with 1; volts starter overvoltage (15 volts aoove Starter Breakdown
Voltage} with the tube in total darkness (See Fig. h.)

Note in Negative anode voltage applied through 8000 ohms. Starter connected
to anode through 100,000 ohms.

EAADLDV'G

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

A few types contain a larger quantity of radium bromide in which the radium
approximates that found on a luninous watch dial. These types bear a red three-
oladed propel e-r shaped symbol on the tube envelope. Instructions for handling
such tubes are given below and also in Bell system Practices 101' Central Office
m-ntemce.

Installations ordinarily require no precautions against radiation. However,
quantities o: the tubes should not as so in tolled, or so stored outside the
shippiroig carton, that they will De within a few inches of personnel or in proxi-
:ity ophotographic fi IL: for exterded _eriods of tine. For example, however, a
l+O-hour week exposure at about one (1) foot from a bank of 500 tubes (covering
an area of 20 inches x its 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.
(1)) Avoid contacting broken parts with bare hands.

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

(d) D' spose of broken or dexective tubes as they are taken out of service.
One or two tubes at a time may be disposed of wi th normal waste rate-rial.
Accmmlation of tubes in one concentrated area 0: the place 0. final
disposit_on should be avoided.