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GU-91B

TETRODE

The GU-91B tetrode is used for power amplification in traveling-wave and single-sideband signal amplifiers, and as a power amplifier in RF equipment.

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: metal ceramic.
Cooling: forced air.
Height: a most 95 mm.
Diameter: at most 72 mm.
Mass: at most 600 g.

gu-91b(2)00061.jpg

OPERATING ENVIRONMENTAL CONDITIONS
Vibration ioads:
frequencies, Hz 1-80
acceleration, m/s², at most 49
Multiple impacts:
acceleration, m/s², at most 392
impact duration, ms, at most 10
Ambient temperature, °C -60 to +85
Relative humidity at +35 °C without moisture condensation, %, at most 98

BASIC DATA
Electrical Parameters
Heater voltage (AC or DC), V 12.6
Heater current, A 4.1-4.7
Anode voltage, V 1,600
Grid 2 voltage, V 350
Negative bias voltage, absolute value (at anode current 1,000 mA, anode voltage 1,600 V, grid 2 voltage 350V), V 20-55
Negative cutoff voltage, absolute value (at anode voltage 2,000 V, grid 2 voltage 350 V, anode current 20 mA), V, at most 130
Grid 2 current (at anode current 1,000 mA, anode voltage 1,600V, grid 2 voltage 350 V), mA -25Þ+10
Anode current at zero grid 1 voltage, A, at least 2.7
Mutual conductance (at anode current 1,000 mA, anode voltage 1,600V, grid 2 voltage 350 V), mA/V 30-65
Relative level of combination components of third and fifth orders (at anode voltage 2,000 V, grid 2 voltage 350 V, bias voltage corresponding to quiescent anode current 500 mA, drive voltage equal to bias voltage at frequencies 0.1-1 MHz), dB, almost -32Þ-35
Output power under conditions of class  (at anode voltage 1,800 V, ghd 2 voltage 350 V, bias voltage corresponding to quiescent anode current 200 mA, anode current DC component 200 mA at 250±25 MHz), W, at least 700
Interelectrode capacitance, pF:
input, at most 86
output, at most 15
transfer, at most 0 15

Limit Operating Values
Heater voltage (AC or DC), V 12.0-13.2
Anode voltage, V:
DC 2,000
instantaneous value 3,750
Grid 2 voltage, V 350
Negative grid 1 voltage (DC, absolute value), V 150
Cathode-heater voltage (either polarity, absolute value), V 100
Cathode current, mA:
DC component 1,400
instantaneous value 4,500
Dissipation, W:
anode 1,600
grid 2 20
grid 1 0.1
Operating frequency, MHz 250
Minimum cathode heating time, s 180
Minimum warm up time, s 300
Envelope temperature (at hottest point), °C 200

gu-91b(3)00071.jpg
Averaged Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 350V

gu-91b(3)00072.jpg
Averaged Grid 2-Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 350V

gu-91b(3)00073.jpg
Averaged Anode-Grid and Grid Characteristic Curves:
Uf = 12.6V; Ug2 = 350V;
————— Ig1;
- - - Ig2