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