Western electric 323 b brochure

Page 1

BELL SYSTEM PRACTICES SECTION AB46.3233
Transmission Engineering and Data Issue 2, October 1962
Electron Tube Data A. T.& T. C0. Standard

ELECTRON TUBE DATA SHEET
WESTERN ELECTRIC 3238 ELECTRON TUBE

233

Meg: 0.: A 5

DESCRIPTION

Kw
The 3233 is a thre -electrod N: cury-vapor and gas-filled thyratrcn with a
negative controjégytf istlc. This tube is designed for use in regulated
or controlled r1,

1250 volts
1.5 amperes

FILE: THYRATRON SECTION

3233

(:) American Telephone and Telegraph Company 1962

Page 2

323B - Page 2

HniluUER _.T1 'GSl Absolute Values

Peak Anode Voltage

Inverse . . . . . . . . . . . . . . . . . . 1250 volts

FOPW;rd . . . . . . . . . . . . . . . . . . 1250 volts
Cathode Current

Peak. . . . . . . . . . . . . . . . . . . . 6 amperes

Average . . . . . . 1.5 amperes

Surge (maximum duration 0.1 second) . . . . 120 amperes

Averaging Time. . . . . . . . . . . . . . . 5 seconds
Negative Grid Voltage

Before Conduction . . . . . . . . . . . . . 500 volts

During Conduction . . . . . . . . . . . . . 10 volts
Positive Grid Current, Average

(averaging time - one cycle). . . . . . . . .OlO amperes

Condensed Hercurv Temperature Limitsl. . . . . -55 to + 80 centigrade

ELECTRICAL DATA
Kin. Boge Max.

Filament Voltage . . . . . . . . . . . . . 2.37 2 5 2. 62 volts
Filament Current at 2. 5 Volts. . . . . . . . . . . --- 7.0 7. 75 amperes
Filament Heating Time Required . . . . . . . . . . 15 ~-- --- seconds
Anode to Grid Capacitance. . . . . , . . . . . . . --- 1.8 -- uuf
Grid to Filament Capacitance . . . . . . . . . . . --- 5.0 --» uuf

Deicnization Time, Approximate
Ebb-1250 volta;TEg-800;Ib-6 amperas;
Ecc--18 volts; Rg-ZO, 60C ohms. . . . . . . . . . -- 1200 --- microseconds

Ionization Time, Approximate}. . . . . . . . .
Ebb-100 volts; TEE'LOC: grid overvoltage-S volts . __- 35 --- microseconds
Ebb-100 volts; THg-BOC; grid overvoltsge-BS volts. --- 0.5 "-- :icrosecond
Anode Voltage Drop . . . . . . . . . . . . . . . . ~-- 15 --- volts
Critical Grid Current at 220 Anode Volts . . . . . --- --- 5 microanpsres

Change in Critical Grid Voltage at
500 Anode Volts from *20 to +BOTHg. . . . . . . . _-- 0,2 ___ volt

KEQEAEICAL DATA

Type of Cooling. . . . . . . . . . . . . . . Convection
Equilibrium Condensed iercury Tenrerature

Rise above ambient, Approximate
At Full Load. . . . . . . . . . . . . . . . . . . . . . 3O centigrade

20 centigrade
Vertical-base down
3 ounces

At No Load. . . .
Eounting Position.
\e t "eight, Epproximate. . . . . . . . . . . . . . . .
Dimensions and pin connections shown in outline drawing on Page A

1. For starting conditions only. Equilibrium operation is limited to 920°
minimum condensed mercury temperature.

2. Deionization time decreases with an increase in negative grid voltage or
with a decrease in (a) condensed mercury temperature (THg), (b) grid resis-
tance or (c) anode current immediately preceding the end of conduction.

3. Ionization time decreases with an increase in (a) anode voltage, (b) con-
densed mercury temperature (THg) or (c) grid overvoltage. Grid overvoltage
is defined as the magnitude by which the applied voltage exceeds, in a
positive direction, the critical grid voltage value. Critical grid voltage
is the instantaneous value of grid voltage at the time when anode current

starts to flow.