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GU-29

TETRODE

The GU-29 beam-power double tetrode is used as an oscillator and a power amplifier operating in the metric wavelength range in RF equipment.

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: glass, no-base.
Cooling: forced air.
Height: at most 110 mm.
Diameter: at most 61 mm.
Mass: at most 125 g.

gu-29(1)1.jpg
1, 7 - 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; A1 - anode of first tetrode - top lead; A2 - anode of second tetrode-top lead

OPERATING ENVIRONMENTAL CONDITIONS
Ambient temperature, °C 10 to +55
Relative humidity at up to +25 °C, % 98

BASIC DATA
Electrical Parameters
Heater voltage, V 12.6
Heater current, A 1-1.3
Anode current (at anode voltage 250 V, grid 1 voltage 11 V of first tetrode, grid 1 voltage 100 V of second tetrode, grid 2 voltage 175 V), mA 38-85
Interelectrode capacitance, pF:
input, at most 13-17
output, at most 5-9
transfer, at most 0.1
Output power, W, min:
at anode voltage 400 V, grid 2 voltage at most 225 V, operating frequency 100-200 MHz 42
over 500 h of service 34

Limit Operating Values
Heater voltage, V:
with heaters connected in parallel 5.7-6.9
with heaters connected in series 11.3-13.8
Anode voltage, V 750
Grid 2 voltage, V 225
Dissipation, W:
anodes 40
grid 2 7
grid 1 1-
Envelope temperature, °C 175

gu-29(2)1.jpg
Characteristic Curve Showing Anode Dissipation versus Ambient Temperature (at bulb temperature Tb 175 °C)