GU-50 PENTODE

The GU-50 pentode is used as a RF oscillator and power amplifier in the metric wavelength range in RF equipment

GENERAL

Cathode: indirectly heated, oxide-coated.
Envelope: glass, no-base.
Height: at most 93.5 mm.
Diameter: at most 45.3 mm.
Mass: at most 100 g

BASIC DATA Electrical Parameters
Heater voltage, V	12.6
Heater current, A	0.6-0.85
Mutual conductance (at anode voltage 800 V, grid 2 voltage 250 V, grid 1 voltage increment 5 V, anode current 50 mA), mA/V	3-5.5
Bias voltage at operating point, V	25-55
Penetration factor of grid 1 relative to grid 2, %	16-26
Interelectrode capacitance, pF:
input, at most	13-15
output, at most	10.3
transfer, at most	0.1
Output power, W, max.:
at anode voltage 800 V, grid 2 voltage 250 V, grid 1 voltage -100 V, anode current, at most 150 mA	55
over 1,750 h of service	40

Limit Operating Values
Heater voltage, V	11.3-13.9
Anode voltage at different wavelengths, V:
6.5 m or longer	1,000
6.5-4.5 m	800
4.5-3.5 m	700
3.5-2.5 m	600
Grid 2 voltage, V	250
Voltage between cathode and heater, V	200
Dissipation, W:
anode	40
grid 2	5
grid 1	1
Envelope temperature, °C	200

Averaged Anode-Grid 2 Characteristic Curves:
U_f = 12.6V; U_g2 = 250V; U_g3 = 0

Averaged Grid 2-Anode Characteristic Curves:
U_f = 12.6V; U_g2 = 250V; U_g3 = 0

Averaged Characteristic Curves:
U_f = 12.6V; U_g2 = 500V; U_g3 = 0
_____ anode-grid;
- - - grid 2