Western electric 451 a brochure

Page 1

BELL SYSTEM PRACTICES AB46.451A
Transmission Engineering and Data Issue 1, August 1962
Electron Tube Data A.T. & T. Co. Standard

ELECTRON TUBE DATA SHEET
WESTERN ELECTRIC 45|A ELECTRON TUBE

. five/Ir
, \ .Heclric 1?

45m

MACE \N U5A.
52\3

DESCRIPTION

The 451A is a four-electrode, inert-gas filled cold cathode tube for use as a
relay device. The tube is provided with an anode-cathode gap and a starter anode-
starter cathode gap such that isolation of the control (starter gap) and controlled
(main gap) portions of a circuit may be obtained.

This tube is designed for socket mounting. It is identical, electrically and
mechanically, to the 425A except that it is not attached to a plastic angle mounting
bracket assembly.

CHARACTERISTICS

Peak Anode Voltage . . . . . . - - - . . - . . . . 180 180 volts
Average Starter Cathode Current. - - - ~ . - . - - ~ 0.7 7.0 milliamperes
Average Main Cathode Current. . . . . . . . . . . . 5,0 50 milliamperes
Average Life, Approximate . . . . . . . . . . . . . 10000 10 hours

FILE: COLD CATHODE SECTION

American Telephone and Telegraph Company 1962
© 45|A

Page 2

45l A -PAGE 2

MAXIMUM RATINGS, Absolute System(Note n

Peak Voltage, Forward or Inverse
Anode to all Other Electrodes
Cathode to all other Electrodes

Cathode Current (Note m
Peak . . .

Average
Averaging Time .

starter Cathode Current (Note 2)
Peak . . .
Average .

Averaging Time

Peak Inverse Current Anode........
Starter Anode

Ambient Temperature Limits

ELECTRICAL DATA, Throughout Life

Starter Breakdown Voltage (NoteS). .
Starter Voltage Drop at 2. 5 Milliamperes
Anode Voltage Drop at 10 Milliamperes
Transfer Current(Note 4)

Negative Cathode Transfer Voltage (Note5)

Ionization Time, Starter Gap (Approx. ) (Note 5)

Deionization Time, Main Gap (Approx.).
MECHANICAL DATA
Mounting .

New Weight, Approximate.
Dimensions and Connections.

HANDLING

180 volts
180 volts

50 milliamperes
20 milliamperes
2 seconds

7 milliamperes
2.5 milliamperes
2 seconds

5 milliamperes
1 milliamperes

. -55; to +85° centigrade
Min. Bogey Max.
67 80 90 volts
55 70 75 volts
58 70 80 volts
See Curve, Figure 3, Page 4
- -25 -40 volts
- 5 - milliseconds
- 1 - millisecond
Any position
0.3 omme

See outline drawing on page 4

This tube contains a small amount of krypton-85 gas which is a by-product
radioactive material. The amount of krypton-85 is less than five microcuries, which
is too small an amount to require any special care in use.

Atomic Energy Commission regulations require that the individual tube carton
for tubes containing by-product radioactive material be appropriately marked. The
marking includes the statement that tube disposal should be in approved manner.

Approved instructions for disposal of tubes containing krypton-85 are as

follows;

Tubes to be disposed of should be broken or crushed in a well
ventilated place releasing any resulting vapors to the outside
atmosphere. The residual broken or crushed tubes should be dis-
posed of in a normal public trash disposal system. Tubes should be
disposed of at a rate of not more than 100 each week from any one
location. Avoid breathing vapors from broken tubes.