Western electric 444 a brochure
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Page 1
1 .' BELL SYSTEM PRACTICES AB3+6J+MLA
Transmission Engineering and Data Issue 1, August 1960
Electron Tube Data A.T.&T. Co. Standard
. ELECTRON TUBE DATA SHEET
WESTERN ELECTRIC 444A ELECTRON TUBE
.e-e
DESCRIPTION
The 1mm tube is a medium power helix-type
traveling wave amplifier for application in the
6000 megacycle frequency region. It is intended
primarily for operation as a transmitting amplifier
. in the repeater stations of long-distance radio relay
stations.
J CHARACTERISTICS
\ Heater Voltage . . . . . . . . . . . . . . . . . 6.3 volts
HeaterCurrent................. 0.92amp.
. Accelerator Anode Voltage . . . . . . . . . . . . 2700 volts
HelixVoitage.................. 2h00voits
Collector Voltage . . . . . . . . . . . . . . . . 1200 volts
Power Output. . . . . . . . . . . . . . . .(Min.) 5 watts
File: Microwave Type Section
Data Sheet Issue 1, 8-60
444A
(9 American 'klephone and lhlegrapll Company 1960
Page 2
444A-PAGEZ
GENERAL CHARACTERISEICS (Notes 1 & 2)
ELECTRICAL DATA
Heater Voltage.
Heater Current .
Acceleration Anode Voltage (Note
Accelerator A.ode Current.
Helix Voltage (Note h) .
Helix Current. .
Collector Voltage.
Power Output . .
Gain at 5 watts (37 dbm)
Noise Figure . .
Gain Variation (Note 5).
Input Match (Note 6) .
Output Hatch (Note 6).
Spurious Noise (Note 7).
MECHANICAL DATA
Cathode. . . . .
Mounting Position.
External Leads .
MAXIMUM RATINGS, Absolute System
Heater Voltage .
o
Accelerator Anode Voltage.
Anode Current. .
Anode Power. . .
Helix Voltage. .
Helix Current. .
Helix Power. . .
Collector Voltage.
Cathode Current.
Collector Power.
Heater Cathode Voltage
Bulb Temperature
c
.U,.-
Collector Temperature (requires forced-air . .
cooling.
Page A )-
Vvv. v. v» V. v.
u
v
6.3 volts
.092 ampere
2700 volts
0.60 milliampere
2hoo volts
0.4 milliampere
1200 volts
5.0 watts
32.5 db
30 db
.20 db
21 db
ll db
10 db
Unipotentiel
Any
5" Flexible with lugs
6.6 volts
3000 volts
2.0 milliamperes
2.5 watts
2700 volts
2.0 milliamperes
2.5 watts
2000 volts
SO milliamperes
80 watts
.: ks volts
125°C
150°C
See Operating precautions - Paragraph A
O Q...»