Western electric 441 a brochure

Page 1

BELL SYSTEM PRACTICES AB46.441A
Transmission Engineering and Data Issue 1, January 1962
Electron Tube Data A.T.& T. Co. Standard

ELECTRON TUBE DATA SHEET
WESTERN ELECTRIC 44IA ELECTRON TUBE

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441A

TRIODE
VOLTAGE AMPLIFIER

DESCRIPTION

The 441A is a filamentary triode designed for use as a voice frequency and
carrier frequency voltage amplifier, detector, or modulator. The 441A is identical
to the 102R electron tube except that it is fitted with a standard A4-9 medium
4-pin push type base.

CHARACTERISTICS

Filament Current (Note 1, Page 2) - - - - - . - . - - - 0.50 ampere

Plate Current- . . - Eb = 130 volts - ~ - ~ - - ~ - 0.60 milliampere
E6 = -2.0 volts

Peak output Voltage ' R1 = 0.1 megohm 37 volts

ELECTRON TUBE DATA SHEET
FILE: GENERAL PURPOSE SECTION

© American Telephone and Telegraph Company 1962 44|A

Page 2

44IA- PAGE 2

GENERAL CHARACTERISTICS
Electrical Data

Filament Voltage (D-C) . .
Filament Current (D-C) (Note 1)

Direct Interelectrode Capacitances.

Grid To Plate , .
Grid To Filament,
Plate To Filament

Mechanical Data

Cathode
Bulb -
Base > - ~ - - ~
Mounting Position-

Dimensions and pin connections shown in outline drawing on page 6.

Preferably vertical,

2.1 volts
0.5 amperes
5.1 uuf
4.0 uuf
2.3 uuf

Coated Filament
ST 14
A4-9 medium 4-pin

if horizontal the position

of the plane of the filament should be vertical

MAXIMUM RATINGS, Absolute System (Note 2)

Filament Voltage

Plate Voltage.

Plate Power

TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS
Filament Current . 0.5
Plate Voltage 130
Grid Voltage . -2.0
Plate Current. 0.60
Transconductance 530
Plate Resistance 58000
Amplification Factor. 30.9
Load Resistance . . 0.1
Peak Output Voltage . 37

0.5
160
-3.0
0.55
520
60000
30.9
0.1
53

2.2 volts
200 volts
0.5 watts
0.5 ampere
190 volts
-2.0 volts
1.85 milliamperes
800 micromhos
39000 ohms
31.0
0.3 megohms
50 volts

Note 1: The filament of this tube is designed to operate on a current basis and should be operated
at as near the rated current as practicable.

Note 2' In the Absolute System the maximum ratings specified are limiting values above which the
serviceability of the device may be impaired from the viewpoint of life and satisfactory
performance. Maximum ratings, as such. do not constitute a set of operating conditions and
all values may not, therefore. be attained simultaneously.