Western electric 401 a brochure

Page 1

BELL SYSTEM PRACTICES I
TRANSMISSION ENGINEERING AND DATA
ELECTRON TUBE DATA

SECTION ABAGADIA
ISSUE 2, AUGUST I948
A.T.&T. CO. STANDARD

IENTODE >
MINIATURE Wafer?! Electric

DESCRIPTION

The 5590/401A* is a 7-pin miniature pentode having an indirectly heated cathode. It
is designed for use in amplifier circuits at high and ultra high frequencies.

CHARACTERISTICS
Heater Voltage 0 6.3 volts
Plate Current
(Eb : Ea, : 90 volts, E. : 75.0 volts) 3.9 milliamperes
Transconductance
(Eh : 13..2 : 90 volts, EA1 : -5.0 volts) 2000 micromhos

ELECTRON TUBE DATA SHEET
FILE: MINIATURE SECTION
11.47

Page 2

5590/4OTA - PAGE 2
GENERAL CHARACTERISTICS

ELECTRICAL DATA

Heater Voltage . 6.3 volts
Heater Current . 150 milliamperes
Direct Intetelectrode Capacitance; . without with
external shield external shield
(RLiA $315)
Grid to Plate (max) 0.017 *0.010 uuf
Input 3.2 :3 3.4 uuf
Output 2.0 * 2.9 uuf

MECHANICAL DATA

Cathode Coated Unipotential
Bulb . T 5%

Base . . Small Button 7-pin
Mounting Position . . Any

Dimensions and pin connections shown in outline drawing on Page 4

MAXIMUM RATINGS, Design-Center Values

Plate Voltage 180 volts

Screen Voltage 140 volts

Plate Dissipation 1.7 warts

Screen Dissipation 05 watts
Cathode Current 18 milliamperes
Heater-Cathode Voltage 90 volts

Bulb Temperature 120 centigrade

TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS, CLASS Al AMPLIFIER

Plate Voltage 45 90 90 120 volts
Screen Grid Voltage . . 45 90 90 120 volts
Control Grid Voltage -1.5 ~50 ..... . --7.0 volts
Cathode Bias Resistor ....... . .. 820 ohms
Plate Current 3.0 3.9 4.3 5.1 milliamperes
Screen Grid Current 1.1 1.3 1.4 1.8 milliamperes
Plate Resistance . . 0.29 0.45 0.41 0.41 megohm
Tmnsconductance 2000 2000 2100 2200 micromhos
Grid Voltage (approximate) for

Plate Current of 10 microamperes -5.3 -10.6 . . -14.3 volts

¢External shield connected to tathode pins 2 and 7
I0

56: 9o vons E: :0

EC; 90 vons

on

PLATE CURRENT

IN MILLIAMPERES
SCREEN GRID CURRENT

IN MILLIAMPERES

-8
0 40 80 120 160 200 240 0 4O 80 120 160 200 240
PLATE VOLTAGE PLATE VOLTAGE