Western electric 259 a brochure

Page 1

.|. :1 5|,» Au .s . .IION A3461. A
TRANSMISSION ENGINEERING AND DATA ISSUE I, AUGUST 1948
ELECTRON TUBE DATA A.T.&Ti COi STANDARD

TETRODE .
Western Electric
DESCRIPTION

The 259A is a tetrode having an indirectly heated cathode. It is designed for use as a
. radio-frequency voltage amplifier. It may also be used as a detector or audio-frequency
voltage amplifier.

CHARACTERISTICS

Heater Voltage , . . . . , . r r , , . r . , . 2.0 volts
Plate Current ] Eh = 180 volts; E: Z 75 volts; 1 6.0 milliamperes
. Transconductance J 111 : -1.5 volts l 1490 micromhos

FILE: GENERAL PURPOSE SECTION
2-48

ELECTRON TUBE DATA SHEET l
l

Page 2

259A - PAGE 2

GENERAL CHARACTERISTICS

ELECTRICAL DATA

Heater Voltage, A-C or D-C 2.0 volts
Heater Current , , 1.60 amperes .
Direct Interelectrode Capacitances without with I
external shield external shield
(RMA :312)
Grid to Plate (maximum) 0.017 *0.00,7 uuf
Input , , 6.0 *7.3 uuf
Output 12.5 *13.0 uuf
9
MECHANICAL DATA
Cathode Coated unipotential
Bulb ST14
Base Medium 5-pin, with bayonet pin
Mounting Position Any
Dimensions and pin connections shown in outline drawing on Page 7
MAXIMUM RATINGS, Design-Center Values
Plate Volmge 250 volts
Screen Grid Voltage 90 volts
Plate Dissipation 2.0 watts
Screen Grid Dissipation 0.4 watt
Cathode Current 10 milliamperes
Heater-Cathode Voltage 100 volts

TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS

Plate Voltage . , , , , 135 180
Screen Grid Voltage 75 75
Control Grid Voltage ~15 -1.5
Plate Current . . , . . . . . . . . . 5.8 6.0
Screen Grid Current 2.1 2.0
Plate Resistance . . . . . . . . . . 0.32 0.52
Transconductance . . . . . . 1 440 1490
Control Grid Voltage, Approximate, for

10 Microamperes Plate Current -9.5 -9.5

180 volts .

90 volts
*1.5 volts
8.3 milliamperes
2.8 milliamperes
0.35 megohm

1670 micromhos

- 1 2 volts

$W'ixh external shield (RMA #312) connected (0 cathode pin.