Western electric 440 a brochure

Page 1

BELL SYSTEM PRACTICES AB46.440A
Transmission Engineering and Data Issue 1, January 1962
Electron Tube Data A.T.& T. Co. Standard

ELECTRON TUBE DATA SHEET
WESTERN ELECTRIC 440A ELECTRON TUBE

TRIODE
LOW- POWER AMPLIFIER

DESCRIPTION

The 440A is a filamentary triode designed for use as a voice frequency and
carrier frequency amplifier where low power output is required, also as an oscil-
lator, a modulator, or a demodulator. The 440A is identical to the 101F 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 . . . . . . . . 6.8 milliamperes

Power Output Ec = '3 V°1ts } 53 milliwatts
R1 = 12000 ohms

ELECTRON TUBE DATA SHEET
FILE: GENERAL PURPOSE SECTION

© American Telephone and Telegraph Company 1962 440A

Page 2

440A - PAGE 2

GENERAL CHARACTERISTICS
Electrical Data

Filament Voltage (D- C) . - -
Filament Current (D- C) (Note 1)
Direct Interelectrode Capacitance
Grid To Plate . . . .
Grid To Filament.
Plate To Filament

Mechanical Data

Cathode

Bulb

Base

Mounting Position

-Preferably vertical,

4.15 volts
0.50 ampere
5.9 uuf
4.2 uuf
2.7 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 .

4.30 volts
200 volts
2.0 watts

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

TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS

Filament Current-

Plate Voltage

Grid Voltage

Plate Current
Transconductance

Plate Resistance -
Amplification Factor
Load Resistance

Power Output

Total Harmonic Distortion

- 0.50 0.50 0.50 0.50 ampere
130 160 190 190 volts
-8 -10 -14 -14 volts

~ 6.8 10.0 10.9 10.9 milliamperes

. 1120 1300 1330 1330 micromhos

~ 5800 5000 4900 4900 ohms
6.5 6.5 6.5 6.5

.12000 5000 4900 12000 ohms
53 100 205 180 milliwatts
1.4 3.2 4.5 1.4 per cent

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.