STC NavigatoR / Transmitting Tubes / Tube gu-4a

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GU-4A

TRIODE

The GU-4A triode oscillates and amplifies power at frequencies up to 100 MHz.

GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: glass-to-metal with ring grid lead.
Cooling: forced (water for anode, air for bulb and metal-to-glass seals, air for stem).
Height: at most 320 mm.
Diameter: at most 152 mm.
Mass: at most 5 kg.

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

BASIC DATA
Electrical Parameters

Filament voltage (AC or DC), V 8.3

Filament current, A 135-155

Resistance of unheated cathode, Om 0.006

Mutual conductance (at anode voltage 3 kV and anode currents 4 and 6 A), mA/V 20-40

Gain coefficient (at anode current 4 A and anode voltages 3 and 5 kV) 48-70

Output power (at anode voltage 6 kV, anode current at most 6 A, negative grid voltage 40 V), kW, at least 13

Interelectrode capacitance, pF, max.:

input 40

output 1

transfer 35

Limit Operating Values

Filament voltage (AC or DC), V 8.3-8.8

Maximum filament starting current, A 218

Maximum anode voltage, kV 6

Maximum dissipation, W:

anode 2x10⁴

grid 800

Maximum operating frequency, MHz 100

Maximum temperature at bulb and metal-to-glass seals, °C 150

BASIC DATA Electrical Parameters
Filament voltage (AC or DC), V	8.3
Filament current, A	135-155
Resistance of unheated cathode, Om	0.006
Mutual conductance (at anode voltage 3 kV and anode currents 4 and 6 A), mA/V	20-40
Gain coefficient (at anode current 4 A and anode voltages 3 and 5 kV)	48-70
Output power (at anode voltage 6 kV, anode current at most 6 A, negative grid voltage 40 V), kW, at least	13
Interelectrode capacitance, pF, max.:
input	40
output	1
transfer	35

Limit Operating Values
Filament voltage (AC or DC), V	8.3-8.8
Maximum filament starting current, A	218
Maximum anode voltage, kV	6
Maximum dissipation, W:
anode	2x10⁴
grid	800
Maximum operating frequency, MHz	100
Maximum temperature at bulb and metal-to-glass seals, °C	150