Western electric 349 a brochure
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Page 1
BElI. SYSTEM "ACTICES SECTION AW..M9A
TRANSMISSION INOINIEIING AND DATA ISSUE I. NOVEMBER I94!
ELECTRON TUE! DATA A.T.IT. CO. STANDARD
PENTODE W512! Electric
DESCRIPTION
The 349A is a suppressor grid, power pentode with an indirectly heated cathode.
It is designed for use as an audio-frequency power amplifier in Class A| and ABl
service.
CHARACTERISTICS
Heater Voltage 6.3 volts
Pl t C t W 2.5 Il'
a e utren Eu 2 E.- 2 250 volts; 3 mt iamperes
Transconductance 4250 micromhos
El : -14 volts
Power Output J 3.5 watts
ELECTRON TUBE DATA SHEET
FIéLE: GENERAL PURPOSE SECTION
1- 8 349A
FENTODE
Page 2
349A - PAGE 2
GENERAL CHARACTERISTICS
ELECTRICAL DATA
Heater Voltage, A-C or D-C
Heater Current
Direct lnterelectrode Capacitances
Grid to Plate
Input
Output
MECHANICAL DATA
Cathode
Bulb
Base
Mounting Position
Dimensions and pin connections shown in o
MAXIMUM RATINGS, DesignvCenter Values
Plate Voltage
Screen Grid Voltage
Plate Dissipation
Screen Grid Dissipation
Cathode Current
Heater-Cathode Voltage
6.3 volts
. 1.0 ampere
without with
external shield external shield
(RMA 1311)
0.46 *0.31 uuf
11.2 *11.7 uuf
8.1 *10.5 uuf
Coated unipotential
TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS
SINGLE TUBE AMPLIFIER-PENTODE CONNECTION
Plate Voltage
Screen Grid Voltage
Control Grid Voltage
Cathode Resistor
Peak A-F Grid Voltage
Zero Signal Plate Current
Maximum Signal Plate Current
Zero Signal Screen Grid Current
Maximum Signal Screen Grid Current
Transconductance
Plate Resistance
Load Resistance
Maximum Signal Power Output
Total Harmonic Distortion
ST12
Small shell octal
, Any
utline drawing on Page 7
250 volts
250 volts
12 watts
3.5 wares
50 milliamperes
150 volts
180 250 250 volts
180 250 250 volts
-8 -14 . . . volts
. . . . . . 330 ohms
8 10 10 volts
28.0 32.0 32.0 milliamperes
29.5 34.0 30.5 milliamperes
6.0 6.5 6.5 milliamperes
8.2 11.0 10.5 milliamperes
4100 4250 4400 micromhos
70000 84500 75000 ohms
5000 7000 7000 ohms
1.8 3.6 3.3 watts
6.3 8.0 8.8 per cent
" With external shield (EMA #311) connected to cathode p'm.