Western electric 311 a brochure

Page 1

BELL SYSTEM PRACTICES SECTION AB46.3IIA
TRANSMISSION ENGINEERING AND DATA ISSUE 1, DECEMBER 1943
ELECTRON TUBE DATA A.TI&T. CO. STANDARD

PENTODE >
Western Electric
DESCRIPTION
The 311A is a suppressor grid power pentode having an indirectly heated cathode.
. It is designed for use as an audio, carrier or radio-frequency amplifier.
CHARACTERISTICS
Heater Voltage . _ . _ _ _ _ 10.0 volts
Plate Current E g 1 5 l _ . 33 milliampetes
. Transconductance _ 5 v0 ts 2900 micromhos
E2 : 155 volts; Ec1 = * 15 volts

Power Output 2.5 watts

ELECTRON TUBE DATA SHEET
FILE: GENERAL PURPOSE SECTION
5-48

Page 2

311A _ PAGE 2
GENERAL CHARACTERISTICS

ELECTRICAL DATA

Heater Voltage, A-C or D-C
Heater Current . .
Direct Interelectrode Capacitances without

external shield

Grid to Plate , . . . . . . . 0.32
Input , , _ _ , , 8.0
Output , . , 8.5

MECHANICAL DATA

Cathode

Bulb

Base

Mounting Position

Dimensions and pin connections shown in outline drawing on Page 6

MAXIMUM RATINGS, Design-Cemer Values

Plate Voltage

Screen Grid Voltage
Plate Dissipation
Screen Grid Dissipation
Cathode Current
Heater-Cathode Voltage

TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS

SINGLE TUBE AMPLIFIER-CLASS A,

Plate Voltage , 135
Screen Grid Voltage , 135
Control Grid Voltage -15
Peak A-F Grid Voltage , 15
Zero Signal Plate Current 33
Maximum Signal Plate Current 36
Zero Signal Screen Grid Current 6.5
Maximum Signal Screen Grid Current 11.0
Transconductance 2900
Plate Resistance 40000
Load Resistance , . 3500
Maximum Signal Power Output 2.0
Total Harmonic Distortion . . 9.0

10.0 volts
0.64 ampere
with

external shield
(RMA e131 1)

0.09 uuf
9.5 uuf
10.4 uuf

Coated unipotential

STI 2
Small,
Any

180
150
8

2
60
150

180
135
-15
15
34
38
6.0
10.0
3000
47000
4000
2.8

10.5

5-pin

volts

volts

watts

watts
milliamperes
volts

volts

volts

volts

volts
milliamperes
milliamperes
milliamperes
milliamperes
micromhos
ohms

ohms

watts

per cent