Western electric 249 c brochure

Page 1

BELL SYSTEM PRACTICES SECTION ABL6.2L9C
Transmission Engineering and Data Issue 1, May 1952
Electron Tube Data A.T.& T.Co.Standard

ELECTRON TUBE DATA SHEET
WESTERN ELECTRIC 249C ELECTRON TUBE

QE§§§IPTICN

The 2L9C 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
Average Cathode Current . . . . . . . . . . . . . . . . 0.6L ampere

FILE: RECTIFIER SECTION
ISSUE 1, A-52

249C

Page 2

2L9C - Page 2

EAIIEUE RATINGS. ABSOLUTE VALUES

Peak Inverse Anode Voltage . . . . ...... .

Cathode Current
Peak . . . . . . . ..... . . . .
Average . . . . . . . . . . . . . . . .
Surge (maximum duration 0.1 second) .
Averaging Time . . . . . . . . . . . .
Condensed Mercury Temperature Limits . . .

ELEQIRIQAL.DAIA

Bin.
Filament Voltage . ..... . . . . . . . . . 2.37
Filament Current at 2.5 volts . . . . . . . ----
Filament Heating Time Requiredl . ...... . l5

Anode Voltage Drop ...... . . . .
Critical Anode Voltage . . . . . . . . . .

ew
Type of Cooling . . . . . . . . . . . .
Equilibrium Condensed Hercury Temperature
Rise Above Ambient, Approximate
At Full Load . . . . . . . . . . . . .
At No Load . . . . . . . . . . . . . .
Haunting Positionz . . . . . . . . . . . .
Net Weight, Approximate . . . . . . . . .

7500 volts

2.5 anperes
0.6L ampere
25 amperes

5 seconds

. +20 to +70 centigrede

2.6é volts
8.25 anperes
---- seconds

---- volts
50 volts

Convection

20 centigrada
16 centigrade

Vertical, base and down

3 ounces

1. Mercury may become deposited on the tube elements in shipment, storage

or handling. When 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.

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20
HEATING TIME IN MINUTES

= 257 VOLTS

28