STC NavigatoR / Transmitting Tubes / Tube gu-45a

GU-45A

TRIODE

The GU-45A triode is used as a power amplifier, modulator or oscillator in RF equipment

GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glass-to-metal
Cooling: forced (water for anode, air for stem and envelope)
Height: at most 294 mm.
Diameter: at most 146 mm.
Mass: at most 4 kg

gu-45a(1)1.jpg

OPERATING ENVIRONMENTAL CONDITIONS

Ambient temperature, °C -10 to +55

Relative humidity at up to 25 °C, % 98

BASIC DATA
Electrical Parameters

Filament voltage, V 7.5

Filament current, A 140-160

Mutual conductance (at anode voltage 4 kV, anode currents 2 and 4 A), mA/V 19.5-28.5

Gain coefficient (at anode voltage 8 kV, anode current 2 A) 19-25

Interelectrode capacitance, pF:

input, at most 41

output, at most 3

transfer, at most 27

Negative cutoff voltage (at anode voltage 10 kV, anode current 0.02 A), V 460-690

Limit Operating Values

Filament voltage, V 7.8

Anode voltage (DC), kV:

at frequencies up to 25 MHz 10.5

at frequencies 25-50 MHz 8.4

Filament starting current, A 225

Anode dissipation, kW 20

Operating frequency, MHz 50

Temperature at envelope and seals, °C 150

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

BASIC DATA Electrical Parameters
Filament voltage, V	7.5
Filament current, A	140-160
Mutual conductance (at anode voltage 4 kV, anode currents 2 and 4 A), mA/V	19.5-28.5
Gain coefficient (at anode voltage 8 kV, anode current 2 A)	19-25
Interelectrode capacitance, pF:
input, at most	41
output, at most	3
transfer, at most	27
Negative cutoff voltage (at anode voltage 10 kV, anode current 0.02 A), V	460-690

Limit Operating Values
Filament voltage, V	7.8
Anode voltage (DC), kV:
at frequencies up to 25 MHz	10.5
at frequencies 25-50 MHz	8.4
Filament starting current, A	225
Anode dissipation, kW	20
Operating frequency, MHz	50
Temperature at envelope and seals, °C	150