Western electric 407 a brochure

Page 1

BELL SYSTEM PRACTICES SECTION AB46.407A
Transmission Engineering Data Issue 3, September 1962
Electron Tube Data A.T.& T. Co. Standard

ELECTRON TUBE DATA SHEET
WESTERN ELECTRIC 407A ELECTRON TUBE

DESCRIPTION

The 407A is a 9-pin miniature double triode with separate indirectly heated
cathodes. It is designed for use in amplifier, mixer, oscillator, multivibrator and
clamp circuits. The useful frequency range extends through the VHF range.

9355593§§£§II£§£ Parallel Series

Heater Voltage . . . . . . . . . . . . . . . . 20 or 40 volts
Plate Current per Section. - . } Eb = 150 volts { 8.2 milliamperes
Transconductance per Section. E0 = -2.0 volts 5500 micromhos

FILE: MINIATURE SECTION

© American Telephone and Telegraph Company, 1962

«Indicates a change 407 A

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407 A - PAGE 2

GENERAL CHARACTERISTICS

Electrical Data Parallel Series

Heater Voltage, A-C or D-C (Note 1). . . . . . . . 20 40 volts
Heater Current . . . . . . . . . . 100 50 milliamperes
Direct interelectrode Capacitances . - . . . . - . without with

external shield. external shield
_.> (JEDEC #315)

Grid-to-Plate per Section . . . . . . . . 1.3 * 1.3 uuf
Input per Section. . . . . . . - . - - . . . - 2.2 * 2.3 upf
Output per Section . . . . . . . . . . . 1 0 * 1,3 uuf
Plate-to-Plate . . . ~ . - - - . . - - - - 0 04 "0.03 11111
Plate-to-Plate (maximum) . - - - - . - - - - - - 0.11 0.10 uuf
Mechanical Data

Cathode - . . . . . - - 1 - . . . - - - . . . . . . . Coated unipotential
Bulb ----T6%
Base . . . . . . . . . . . . . . . . . . . . . ..Sma11 button 9- ~pin
Mounting Position . . . - ' - - Any

Dimensions and pin connections shown in outline drawing on page 4.

MAXIMUM RATINGS, Absolute System (Note 2)

II Values are for each section

Plate Voltage . . . . . . . . . . . . . . . . . . . . . . 330 volts
Plate Dissipation . . . . . . . . . . . . . . . . . . . . 1. 6 watts
Plate Current. . . . . . . . . . . . . . . . - - . - . 20 milliamperes
Heater Cathode Voltage . . . . . . . . . . . . . . . . . . 130 volts
Maximum Grid Circuit Resistance for

Fixed Bias . . . . . . . . . . . . . . . . . . . . . . l megohm
Cathode Bias . . . . . . . . . . . . . . . . . . . . . . 2 megohm

TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS - Class A1 Amplifier

Values are for each section

Plate voltage. . . . . . . . . . . . . . . . . 150 150 volts
Grid Voltage . . . . . . . . . . . . . . . . . -2.0 - volts
Cathode Resistor. . . . . . . . . . . . . . . . - 240 ohms
Plate Current. . . . . . . . . . . . . . . . . 8. 2 8.2 milliamperes
Transconductance. . . . . . . . . . . . . . . . 5500 5500 micromhos
Amplification Factor. . . . . . . . . . . 35 35

Grid Voltage (Approximate) for

Plate Current of 10 microamperes . . . . . . . . - 8 - volts

Pin 5 and external shield (EIA #315) connected to cathode pin of section under test.
Elements of other section grounded.

" Pin 5 and external shield (EIA #315) connected to ground with other elements.

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