Western electric 350 b brochure

Page 1

M fiw €M 2796/4.
BELL SYSTEM PRACTICES SECTION AB46.3SOB

Transmission Engineering Data Issue 1, Janna 1950
Vacuum Tuhe Data M 91? A.TT&T. Co, Stgldard
/3 o

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TETRODE .
BEAM POWER AMPLIFIER WSW! £146,776

DESCRIPTION

. The 3503 is a beam power tetrode of the neater-cathode type. It is designed for use as an
audio-frequency amplifier or as a radio-frequency oscillator.

é CHARACTERISTICS

Heater Voltage . . . . . . . . l . . . . . 6.3 volts

Plate Current . . . _ i . . . 93 milliamperes
. Transconductance . . Eh 1 E02 i 250 VOIts' { . . . 8300 micromhos

Power Output E = _14 V01 10.5 watts

ELECTRON TUBE DATA SHEET
FILE: GENERAL PURPOSE SECTION

3-49 350 B

TETRODE

Page 2

3503 - PAGE 2

GENERAL CHARACTERISTICS

ELECTRICAL DATA
Heater Voltage, A-C or D-C .
Heater Current

Direct Interelectrode Capacitanees (without external shield)

Grid to Plate (maximum)
Input .
Output

MECHANICAL DATA

6.3 volts
1.6 amperes

0.5 nut
16 uuf
8 uuf

Coated Unipotential

Medium shell, 7-pin Octal

Cathode
Bulb ST16
Base 4 .
Mounting Pesition Any
MAXIMUM RATINGS, Design-Center Values
Plate Voltage . .
Screen Grid Voltage .
Maximum Signal Plate Current
Plate Dissipation A .
Screen Grid Dissipation 4
Maximum Grid Circuit Resistance for

Fixed Bias

Cathode Bias . _
TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS
SINGLE TUBE AMPLIFIER-CLASS Al
Plate Voltage . 250 350
Screen Grid Voltage . 250 250
Control Grid Voltage . -14 -18
Cathode Resistor . . . ..
Peak A-F Grid Voltage . 14 18
Zero Signal Plate Current 93 62
Maximum Signal Plate Current . 97 81
Zero Signal Screen Grid Current 6.0 2.5
Maximum Signal Screen Grid Current . 15 16
Transconductance 8300 7100
Plate Resistance . 37500 57500
Load Resistance . . i 2000 3200
Maximum Signal Power Output . 10.5 15.8
Total Harmonie Distortion ll 18

360 volts
270 volts
125 milliamperes
27 watts
4 watts

0.1 megohm
0.5 megohm

250 volts

250 volts

volts

130 ohms

14 volts

93 milliamperes

89 milliamperes

5.0 milliamperes

l6 milliamperes
8500 micromhos
34500 ohms
2500 ohms

9.6 per cent

11 per cent