Western electric 249 b brochure

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western electric 249 b brochure

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Page 1

BELL SYSTEM PRACTICES SECTION ABL6.2L9B
Transmission Engineering and Data " Issue 1, May 1952
Electron Tube Data A.T.& T Co.Stendard

ELECTRON TUBE DATA SHEET
WESTERN ELECTRIC 249B ELECTRON TUBE

QESCRIPTICN

The 2L9B is a mercury-vapor diode for use in high voltage rectifier circuits.

The latest gettering techniques and materials are employed in this tube to
insure greater service life.

MAXIMUM RATINGS

Peak Anode Voltage . . . . . . . . . . . . . . . . . . 7500 volts
Averuge Cathode Current . . . . . . . . . . . . . . . 0.6L ampere

FILE: RECTIFIER _SECT10N
ISSUE 3, 4-52

249 B

Page 2

21.913 - Page 2

EAXILUK RATINGS, ABSOLUTE VALUES

Peak Inverse Anode Voltage . . . . . . . . . . . . . . 7500 volts
Cathode Current
Peak . . . . . . . . . . . . . . . . . . . . . . . 2.5 amperes
Average . . . . . . . . . . . . . . . . . . . . . . 0.6L ampere
Surge (maximum duration 0.1 second) . . . . . . . . 25 amperes
Averaging Time . . . . . ...... . . . . . . ¢ 5seconds
Condensed Eercury Temperature . . . . . . . . . . . . +20 to +70 centigrade

ELECTRICAL DATA
Hin. Bove Max.

Filament Voltage . . . . . . . . . ..... 2.37 2.5 2.62 V01
Filament Current at 2.5 volt . . . . . . . ---- 7.5 8.25 amperee
Filament Heating Time Required 1 . . . . . . 15 --- ---- seconds
Anode Voltage Drop . . . . . . . . . . . . . ---- 15 ---- volts
Critical Anode Voltage . . . . . . . . . . . ---- --- 50 volts

fiECHANICAL DATA

Type of Cooling . . . . . . . . . . . . . . . . . . Convection
Equilibrium Condensed Mercury Temperature
Rise Above Ambient. Approximate

AtFullLoad.................. EOcentigrade

AtNoLoad................... lécentigrade
Hounting Pcsition2 . . . . . . . . . . . . . . . . . Vertical, Base and down
Net Weight, Approximate . . . . . . . . . . . . . . 3 ounces

1. Keroury may become deposited on the tube elements in ship:ent, storage
or handling. 'n'hen using the tube for the first time, or after handling.
a filament heating period of 15 to 30 minutes should be allowed to
properly distribute the mercury.

2. Sufficient clearance should be allowed around the tube to insure free

air circulation.

N
O

= 2 37 VOLTS

6

[G

on

AMBIENT IN DEGREES C
.p.

CONDENSED MERCURY
TEMPERATURE RISE OVER

0 4 20 4 28 O
HEATING TIME IN MINUTES