Western electric 102 l brochure

Page 1

BELL SYSTEM PRACTICES SECTION AB46.102L

Transmission Engineering Data Issue 1, January 1950
Vacuum Tube Data A.T.&T. Co. Standard

TRIODE .
AUDIO-FREQUENCY AMPLIFIER WSW! 51961776

DESCRIPTION

The 102L is a filamentary type triode. It is designed for use as an audio-frequency
voltage amplifier or modulator.

CHARACTERISTICS

Filament Current . . . . . . . . . . . . . . 250 milliamperes
Maximum Plate Voltage . . . . . . . . . . . . 180 volts
Amplification Factor . I . . . i . . . . , . . 30

ELECTRON TUBE DATA SHEET

135E: GENERAL PURPOSE SECTION 102 '-

'I'RIODE

Page 2

'IO2L -- PAGE 2

GENERAL CHARACTERISTICS

ELECTRICAL DATA

Filament Current , , , . , , . _ . V _ . . . . 250 milliamperes
Filament Voltage. Nominalé . , . . . . . . . . . . , 2.1 volts
Direct Interelectrode Capacitances without external
shield
Grid to Plate . . . . . . . . . . . . . . . . 5.0 uuf
Input . . . , . . . . . . . . . . . . . . 3.8 uuf
Output , . . , . . . . . . . . . . . . 2.4 not

MECHANICAL DATA

Cathode . . . , . . . . . . . . . . . . . Coated Filament
Base . . . . . . . . i . , , lVIedium 4-pin type with bayonet pin
Mounting Position. . . . . . . . . Preferably vertical; if horizontal, pins #1

and #2 must lie in same vertical plane

Dimensions and pin connections shown in outline drawing on Page 5

MAXIMUM RATINGS, Design-Center Values

Plate Voltage . . . . . . . . . . . . . . . . 180 volts
Plate Dissipation . . . . . . i . . . . . . . . . 0.5 watt
Plate Current . . . . . . . . . . . . . . . . . 7.5 milliamperes

TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS-CLASS AI AMPLIFIER

Filament Current, D-C . . . . . . . . . 250 250 milliamperes
Plate Voltage . . . . . . . . . . . . . 130 160 volts

Grid Voltage . . . . . . . . . . . . . -1.5 -2.0 volts

Peak A-F Grid Voltag . . . . . . . . . . 1.5 2.0 volts

Plate Current . . . . . . . . . . . . . 0.85 1.2 milliamperes
Transconductance . . . , . . . . . . . . 650 800 micromhos
Amplification Factor . . . . . . . . . . . 30.2 30.2

Plate Resistance , . . . . . . . . . . . 46000 39000 ohms

Load Resistance . . . . . . . . . . . . 300000 300000 ohms
NIaximum-Signal Voltage Output . , . . . . . 34 44 peak volts
Total Harmonic Distortion Less Than . . . . . . 1.0 1.0 per cent

*The filament resistance of this tube increases slightly during the first year of operating life.
The voltage given above is the nominal value after the filament resistance has stabilized.