Western electric 310 b brochure

Page 1

BELL S_YSTEM PRACTICES AB+6 . 31013
Transmission Engineering and Data Issue 2, February 1955
Electron Tube Data A.T.&T. Co. Standard

ELECTRON TUBE DATA SHEET
WESTERN ELECTRIC 3|OB ELECTRON TUBE

u...

1

DESCRIPTION

The 310B is an indirectly heated cathode type pentode having a separate
suppressor grid connection. It is intended for use in audio, carrier and radio-
frequency voltage amplifiers, oscillators or modulators. This tube, except for
having special design features to minimize microphonic noise and hum and having
an appreciably lower maximum heater-cathode voltage rating, is identical to the
310A.

CHARACTERISTICS

Heater Voltage . . . . . . . . . . . . . . . . . . . . . . . 10.0 volts

Plate Current . . . Eb = 180 volts; Ecg = 135 volts; . . 5.5 milliamperes
Transconductance . . Eel = -3 volts; E03 = O :> . . 1820 micromhos

File: General Purpose Section
Issue 3, 2-56

3|OB

Page 2

3103 - Page 2

GENERAL CHARACTERISTICS

ELECTRICAL DATA

Heater Voltage . . . . . . . . . . . . . . . . . . . . . . 10.0 volts
Heater Current . . . . . . . . . . . . . . . 320 milliamperes
Direct Interelectrode Capacitances . . . . . without with
external external shield
shield (RETMA #311)
Grid to Plate (maximum). . . . . 0.016 *0.010 uuf
Input: g1 to (h+k+g2+g3+1. 5.). . . 6.0 *7.0 upf
Output: p to (h+k+g2+g3+i. 5.). . . l3 *l3 00f

MECHANICAL DA

Cathode . . . . . . . . . . . . . . . . . . . . . . . Coated unipotential
Bulb . . . . . . . . . . . . . . . . . . . . . . . . 5T12

Base . . . . -. . . . . . . . . . . . . . . . . . . Small, 6-pin
Mounting Position . . . . . . . . . . . . . Any

Dimensions and pin connections shown in outline drawings on Page 5

MAXIMUM RATINGS, Design-Center Values

Plate Voltage . . . . . . . . . . . . . . . . . . . . . . 250 volts
Screen Grid Voltage . . . . . . . . . . . . . . . . . . . 180 volts
Plate Dissipation . . . . . . . . . . . . . . . . . . . . . 2.0 watts
Screen Grid Dissitation . . . . . . . . . . . . . . . . . . 0.h watt
Cathode Current . . . . . . . . . . . . . . . . . . . . 10 milliamperes
Heater-Cathode Voltage . . . . . . . . . . . . . . . . . 30 volts
TYPICAL OPERATING CONDITIONS AKD CHARACTERISTICS
Plate Voltage . . . . . . . . . . . . . . . 135 180 250 volts
Screen Grid Voltage . . . . . . . . . . . . 135 135 135 volts
Control Grid Voltage . . . . . . . . . . . -3 -3 -3 volts
Suppressor Gri d Voltage . . . . . . . . . . 0 0 0 volts
Plate Current . . . . . . . . . . . . . . 5.1+0 5.50 5.60 milliamperes
Screen Grid Current . . . . . . . . . . . . 1.20 1.18 1.17m mlliamperes
Peak A-F Signal Voltage . . . . . . . . . . 3.00 1.50 2.10 volts
Plate Resistance . . . . . . . . . . . . . 0.75 0.90 1.15 megohms
Transconductance . . . . . . . . . . . . . 1800 1820 18h0 micromhos
Load Resistance . . . . . . . . . . . . . 20000 100000 100000 ohms
Power Output . . . . . . . . . . 250 150 310 nilliwatts
Total Harmonic Distort: on . . . . . . . 8.5 6 6 per cent
Control Grid Voltage, Approximate, for

Plate Current of 10 Microanperes . . . . -9.5 -9.5 -9.5 volts

*With external shield (RETMA #311) connected to cathode pin.