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GU-81M 
POWER TRANSMITTING PENTODE


The GU-81M  is a glass pentode with natural air cooling having an output power 400 - 650W at frequencies up to 50 MHz. The tube is designed for use in  stationary Army and  Navy  transmitters.
 

CHARACTERISTICS

Anode Dissipation ...................

 450 W

Screen Dissipation ...................

 120 W

Grid Dissipation .......................

 10 W

Frequency for Max. Ratings .....

 50 MHz

Cathode...................................

indirectly heated, oxide-coated

Heater voltage .........................

 12.6 V

Heater current .........................

10.5 A

Transconductance at Ua= 2 kV; 
Ug2 = 600 V; Ia = 200 mA......

5.5 mA/V

Capacitance
     Input ..................................
     Output ...............................
     Feed-through .....................


28.5 pF
23.5 pF
0.1 pF

Max. Seal and Envelope 
Temperature ...........................


350° C

Maximum Length ....................

260 mm

Maximum Diameter .................

120 mm

Weight (approximate) ..............

 1 k g

Operating Position ...................

Any

Cooling ...................................

Natural

Class of
Operation

Type of Service

Max. Ratings

Typical Operation (grid-driven)

Anode
Voltage,
kV

Screen
Voltage,
V

Cathode
Current,
A

Anode
Voltage,
kV

Screen
Voltage,
V

Anode
Current,
A

Output
Power
W

AB1

RF Linear Amplifier at
50 MHz

3

600

0.6

2500

600

0.5

650

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