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.

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

Averaged Anode Characteristic Curves:
U_f = 12.6V; U_g2 = 350V

Averaged Grid 2-Anode Characteristic Curves:
U_f = 12.6V; U_g2 = 350V

Averaged Anode-Grid and Grid Characteristic Curves:
U_f = 12.6V; U_g2 = 350V;
————— I_g1;
- - - I_g2

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