Western electric 274 b brochure

Page 1

BELL SYSTEM PRACTICES SECTION AB46.2748
TRANSMISSION ENGINEERING AND DATA ISSUE 1, AUGUST 1943
ELECTRON TUBE DATA A.T.&T. CO. STANDARD

W - --< - I
am
' «A

We"

. 4 {IL L"

RECTIFIER .
FULL-WAVE, HIGH VACUUM WSW! 51961716

DESCRIPTION I

. The 274B is a filamentary. octal based, full-wave rectifier designed to supply direct
current from an alternating current source.

CHARACTERISTICS

Filament Voltage , , V . I I 5.0 volts
Maximum Plate Voltage (RMS) per Plate 660 volts
. Maximum D-C Output Current , . . . 225 milliamperes

ELECTRON TUBE DATA SHEET
FILE: RECTIFIER SECTION
1-48

Page 2

274B - PAGE 2
GENERAL CHARACTERISTICS

ELECTRICAL DATA

Filament Voltage , , , 5.0 volts
Filament Current , , , 2.0 amperes

MECHANICAL DATA

Cathode , . , , Coated filament
Bulb , ST16

Base Medium S-pin, octal
Mounting Position Preferably vertical; if horizontal, pins

in and :4 should be in vertical plane
Dimensions and pin connections shown in outline drawing on Page 4

MAXIMUM RATINGS, Design-Center Values

Peak Inverse Voltage 1500 volts
Peak Plate Current per Plate 675 milliamperes
Peak Transient Plate Current per Plate 2.5 amperes

With Choke-Input Filler:

A-C Plate Voltage per Plate (RMS) 660 volts
D-C Output Current 225 milliamperes
Minimum Input-Choke Inductance 5 hemys

With Condenser-Inpul Filler:

A-C Plate Voltage per Plate (RMS) 450 volts
D-C Output Current 160 milliamperes
Minimum Total EEective Plate-Supply Impedance per Plate 100 ohms

TYPICAL OPERATING CONDITIONS

WiIh Choke-Input Filter:

A-C Plate Voltage per Plate (RMS) 550 volts

D-C Output Current 160 milliamperes
D-C Output Voltage, Approximate, at Input to Filter 430 volts

Filter Input Choke . 5 henrys

With Condenser-Input Filter:

A-C Plate Voltage per Plate (RIVIS) 450 volts
D-C Output Current , 140 milliamperes
D-C Output Voltage. Approximate, at Input to Filter 475 volts
Total Effective Plate-Supply Impedance per Plate 180 ohms

Filter Input Condenser . . 4 microfarads