Western electric 266 c brochure

Page 2

266C - PAGE 2

MAXIMUM RATINGS, ABSOLUTE VALUES
Peak Inverse Anode Voltage for

Condensed Mercury Temperature 20 to 40 C 22000 volts
Condensed Mercury Temperature 20 to 50 C , 12500 volts
Cathode Current
Peak
In-phase Operation , 20 amperes
Quadrature Operation , , 40 amperes
Average
In-phase Operation , 5 amperes
Quadrature Operation . 10 amperes
Surge (maximum duration 0.2 second) 200 amperes
Averaging Time . . 60 seconds
Frequency . 150 cycles, sec.
ELECTRICAL DATA Min. Bogey lVIax.
Filament Voltage 4.75 5.0 5.25 volts
Filament Current at 5.0 Volts ........ 42 46 amperes
Cathode Heating Time. Required 300 ................ seconds
Anode Voltage Drop ........ 15 ........ volts
Critical Anode Voltage ................ 100 volts
MECHANICAL DATA
Net Weight, Approximate 41/4 pounds
Equilibrium Condensed Mercury Temperature Rise
At Full Load, Approximate . 18 centigrade
At No Load, Approximate . 15 centigrade
Cooling The condensed mercury temperature should be held within the range

specified for the maximum peak inverse anode voltage appropriate to the
application. If forced-air cooling is necessary, a flow of 6 cubic feet per
minute from a 1-inch nozzle directed at the zone of mercury temperature
control just above the top of the base ordinarily will be adequate.

Mounting This tube should be mounted in a vertical position only, with the filament
end down. The connection to the anode terminal should be flexible.
Suficient clearance should be maintained around the tube to insure free
air circulation.

RATE OF CONDENSED MERCURY
TEMPERATURE RISE

CONDENSED MERCURY
Ki 3.

TEMPERATURE RISE, DEG. C
on

a

0 10 2O 30 40 50 60
TIME IN MINUTES