Western electric 403 a brochure

Page 1

BELL SYSTEM PRACTICES SECTION AB46.403A
Transmission Engineering Data Issue 2, September 1950

Vacuum Tube Data A.T.&T. Co, Standard

PENTODE .
MINIATURE W512! EleCIT'IL

DESCRIPTION

The 6AK5/403A* 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 . . . . . . , . . . . . . . . 6.3 volts

Plate Current . . Eh 2 E02 2 120 volts; . . 7.5 milliamperes
Transconductance . Cathode-Bias Resistor = 200 ohms . . 5000 micromhos

ELECTRON TUBE DATA SHEET

{II-1:5: MINIATURE SECTION 4 o 3 A 5!-

PENTODE

Page 2

1';

6AK5/403A - PAGE 2

GENERAL CHARACTERISTICS

ELECTRICAL DATA

Heater Voltage, A-C or D-C . . . . . . . . . . . . . 6.3 volts
Heater Current . . . . . . . . . . . . . . . . 175 milliamperes
Direct Interelectrode Capacitaan . . . . without with
external shield external shield
(RMA #316)

Grid to Plate (maximum) . . . . . .019 *.010 not

Input . . . . . . . . . . . 3.9 *4.0 uuf

Output. . . . . . . . . . . 2.0 *2.9 uuf

MECHANICAL DATA

Cathode . . . . . . . . . . . . . . . . . . Coated Unipotential
Bulb . . . . . . . . . . . . . . . . . . . T5%

Base . . . . . . . . . . . . . . . . . . . Miniature 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 Grid Voltage . . . . . . . . . . . . . . . 140 volts

Plate Dissipation . . . . . . . . . . . . . . . , 1.7 watts
Screen Grid Dissipation . . . . . . . . . . . . . . 0.5 watt
Cathode Current . . . i . . . . . . . . . . . . 18 millimperes
Heater-Cathode Voltage . . . . . . . . . . . . . . 90 volts

Bulb Temperature. . . . . . . . . . . . . . . . 120 centigrade

TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS-CLASS Al AMPLIFIER

Plate Voltage . . . . . . . . . . . . 120 150 180 volts
Screen Grid Voltage . . . . . . . . . . 120 140 120 volts
Cathode-Bias Resistor . . . . . . . . . 200 330 200 ohms
Plate Current. . . . . . . . . . . . 7.5 6.6 7.7 rnilliamperes
Screen Grid Current. . . . . . . . . . 2.5 2.1 2.4 milliamperes
Plate Resistance . . . . . . . . . . . 0.30 0.40 0.45 megohm
Transconductance . . . . . . . . . . 5000 4500 5100 micromhos
Grid Voltage, Approximate, for

Plate Current of 10 Microamperes . . . . . -6.8 --7.8 -6.9 volts

'Externnl shield connected to cathode pins 2 and 7.