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GU-70B

TETRODE

The GU-70B tetrode is used for linear power amplification and power amplification at frequencies up to 500 MHz in stationary and mobile RF equipment.

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: metal-to-ceramic.
Cooling: forced air.
Height: at most 64 mm.
Diameter: at most 41.5 mm.
Mass: at most 150g.

gu-70b(1)00041.jpg
1 - grid; 2, 4, 6, 8 - cathode; 3, 7 - heater; 5 - vacant; C1 - grid 1; C2 - grid 2; A - anode; I - contact surfaces

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 1-60
acceleration, m/s² 20
Multiple impacts with acceleration, m/s² 147
Ambient temperature, °C -10to+55
Relative humidity at up to +25 °C, % 98

BASIC DATA
Electrical Parameters
Heater voltage (AC or DC), V 6
Heater current, A 3.1-3.7
Mutual conductance (at anode voltage 1.75 kV, grid 2 voltage 400 V, grid 1 voltage change ±2.5 V, anode current 200 mA), mA/V 14-28
Gain coefficient (at grid 2 voltages 400 and 350 V, anode current 200 mA) 9-18
Negative bias voltage (at anode voltage 1.75 kV, grid 2 voltage 400 V, anode current 200 mA), absolute value, V 14-28
Negative cutoff voltage (at anode voltage 2 kV, grid 2 voltage 400 V, anode current 10 mA), absolute value, V, at most 60
Interelectrode capacitance, pF:
input, at most 29
output, at most 7.5
transfer,at most 0.06
Output power under conditions of class AB1 (at anode voltage 2 kV, grid 2 voltage 400 V, grid 2 current at most 20 mA, at frequency 0.1-1 MHz), W, at least 250
Output power under conditions of class  (at heater voltage 6 V, anode voltage 1.9 kV, grid 2 voltage 400 V, anode current DC component 250 mA, frequency 500 MHz), W, at least 125
AB1, over 1,000 h of service, W, at least 200
Relative level of combination components (at heater voltage 6 V, anode voltage 2 kV, grid 2 voltage 400 V),dB:
third-order components, at most -30
fifth-order components, at most -30
Output power under condition of class

Limit Operating Values
Heater voltage (AC or DC), V 5.7-6.3
Anode voltage, kV:
DC 2.0
instantaneous value 3.5
Negative grid 1 voltage, absolute value, V
150
Grid 2 voltage (DC), V 400
Cathode current (DC component), mA 360
Dissipation, W:
anode 350
grid 2:
at frequencies up to 250 MHz 8
at frequencies above 250 MHz 6
grid 1 2
Operating frequency, MHz 500
Temperature at the hottest point of envelope, °C 200

gu-70b(3)00061.jpg
Averaged Anode Characteristic Curves:
Uf = 6V; Ug2 = 400V

gu-70b(3)00062.jpg
Averaged Anode-Grid Characteristic Curves:
Uf = 6V; Ug2 = 400V

gu-70b(3)00063.jpg
Averaged Characteristic Curves:
Uf = 6V; Ug2 = 400V;
_____ grid 2-anode;
_ _ _ grid 1-anode