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GU-32

TETRODE

The GU-32 beam-power double tetrode is used as an oscillator and a RF power amplifier operating in the metric wavelength range in RF equipment.

GENERAL
Cathode; indirectly heated, oxide-coated.
Envelope: glass, no-base.
Height: at most 88 mm.
Diameter: at most 52.5 mm.
Mass: at most 100 g.

gu-32(1)1.jpg
1 - heater; 2 - grid 1 of second tetrode; 3 - grid 2; 4 - cathode and beam-forming plates; 5 - heater (centre tap); 6 - grid 1 of first tetrode; 7 - heater: A1 - anode of first tetrode - top lead; A2 - anode of second tetrode - top lead; I - alignment boss

OPERATING ENVIRONMENTAL CONDITIONS
Vibration loads:
frequencies, Hz 1-200
acceleration, m/s² 49
Multiple impacts with acceleration, m/s² 147
Ambient temperature, °C -45 to +70
Relative humidity at up to + 25 °C, % 98

BASIC DATA
Electrical Parameters
Heater voltage, V 12.6
Heater current, A 0.7-0.9
Anode current (at anode voltaqe250 V grid 1 voltage 10 V of first tetrode, grid 1 voltage -100 V of second tetrode, grid 2 voltage 135 V), mA 18-42
Interelectrode capacitance, pF:
input 6.2-9.4
output 2.8-4.8
transfer at most 0.05
Output power, W, min at anode voltage 400 V, grid2 voltage at most 250 V anode current 19 mA 14
over 2 000 h of service 11

Limit Operating Values
Heater voltage, V:
with heaters connected in parallel 5.7-6.9
with heaters connected in series 11.4-13.8
Anode voltage, V 500
Grid 2 voltage, V 250
Dissipation, W:
anode 15
grid 2 5
Envelope temperature, °C 115

gu-32(2)1.jpg
Characteristic Curve Showing Anode Dissipation versus Ambient Temperature (at bulb temperature Tb 115°C)