GU-17

BEAM-POWER TETRODE

The GU-17 beam-power double tetrode is used for generation or power amplification at frequencies up to 250 MHz in RF equipment.

GENERAL
Cathode: indirectly heated, oxide coated.
Envelope: glass, miniature.
Height: at most 80 mm.
Diameter: at most 22.5 mm.
Mass: at most 25 g.

1 - grid 1 of first tetrode; 2 - cathode and beam-forming plates; 3 - grid 1 of second tetrode; 4 - heater; 5 - heater; 6 - anode of first tetrode; 7 - grid 2; 8 - anode of second tetrode; 9 - heater (centre tap)

BASIC DATA Electrical Parameters
Heater voltage, V	6.3
Heater current, A	0.72-0.88
Mutual conductance (at anode and grid 2 voltages 200 V, end 1 voltage 16 V of first tetrode grid 1 voltage 100 V of 2nd tetrode), mA/V	1.6-3.3
Anode current (at anode and grid 2 voltage 200 V, grid 1 voltage 16 V of 1 st tetrode grid 1 voltage 100 V of 2nd tetiode), mA	10-30
Interelectrode capacitance, pF:
input	5.2-7.8
output	2.2-3.2
transfer, s, at most	0.1
Warm up time, s, at most	40
Output power (at anode voltage 300 V, grid 2 voltage 200V voltage 80 V of grids 1), W, at least	11
Output power over 400 h of service, W, at least	8.8

Limit Operating Values
Heater voltage, V:
with parallel-connected heater	5.7-7
with series-connected heater	11-14
Anode voltage, V	400
Anode voltage at the instant of switching on, V	450
Voltage between cathode and heater, V	-150 to +150
Cathode current, mA	100
Dissipation, W:
anodes	12
grid 2	3
grid 1	0.5
Operating frequency, MHz	250
Envelope temperature, °C	260

Maximum Permissible Anode Dissipation P_{a max} versus Ambient Temperature (at bulb temperature T_b 260 °C)

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