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GU-93 B

TETRODE

The GU-93B tetrode is used for RF power amplification at frequencies up to 250 MHz in general-purpose television transmitters.

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: metal-ceramic.
Cooling: forced air.
Working position: any desired.
Height: at most 145 mm.
Diameter: at most 116 mm.
Mass: at most 3.5 kg.

gu-93b(1)00011.jpg
A - anode; KP - cathode and heater; P - heater; C1 - grid 1; C2 - grid 2

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 1-35
acceleration, m/s² 4.9
Multiple impacts with acceleration, m/s² 147
Ambient temperature, °C 1-55
Relative humidity at up to +25 °C without moisture condensation, % 80

BASIC DATA
Electrical Parameters
Heater voltage (AC or DC), V 12.6
Heater current, A 9.5-12
Mutual conductance (at anode voltage 700 V, grid 2 voltage 400 V, anode current 3,000 mA), mA/V 75-125
Zero anode current (at anode voltage 700 V, grid 2 voltage 400 V, grid 1 voltage 0), A, at least 4
Negative cutoff voltage, absolute value (at anode voltage 4,000 V, grid 2 voltage 400 V, anode current 20 mA), V, at most 240
Interelectrode capacitance in agrounded-cathode circuit, pF:
input, at most 100
output, at most 20
transfer, at most 0.1

Limit Operating Values
Heater voltage (AC or DC), V 13.2-12
Anode voltage, V:
DC 3,800
instantaneous value 6,500
Grid 2 voltage (DC), V 450
Negative grid 1 voltage (DC, absolute value), V 250
Anode current, A:
DC component under conditions of class 2
instantaneous value in the sync pulse mode 9
Grid 1 current (DC component), mA 100
Dissipation, W:
anode 4,000
grid 2 20
grid 1 5
Operating frequency, MHz 250
Minimum cathode heating time, s 240
Temperature at hottest point of envelope, °C 200

gu-93b(2)00021.jpg
Averaged Anode Characteristic Curves:
Uf = 12,6V; Ug2 = 400V

gu-93b(2)00022.jpg
Averaged Characteristic Curves:
Uf = 12.6V; Ug2 = 400V;
_____ anode-grid;
_ _ _ grid 2;
_ . _ grid 1

gu-93b(3)00031.jpg
Averaged Grid-Anode Characteristic Curves:
Uf = 12.6V; Ug2 = 400V