GU-74B

TETRODE

The GU-74B tetrode is used in wideband nontunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment.

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: metal ceramic.
Cooling: forced air.
Height: at most 90 mm.
Diameter: at most 71 mm.
Mass: at most 550 g.

1 - grid 1; 2, 4, 6 - cathode; 3, 7 - heater; 5, C2 - grid 2; A - anode; I - contact surfaces

BASIC DATA Electrical Parameters
Heater voltage (AC or DC), V	12.6
Heater current, A	3.3-3.9
Mutual conductance (at anode voltage 1,000 V, grid 2 voltage 300 V, grid 1 voltage change ±2.5 V, anode current 600 mA), mA/V	26-38
Anode current (at anode voltage 250 V, grid 2 voltage 300 V), mA, at least	1,400
Negative bias voltage (at anode voltage 1,000 V, grid 2 voltage 300 V, anode current 600 mA), absolute value, V	18-32
Negative cutoff voltage (at anode voltage 2,500 V, grid 2 voltage 300 V, anode current 15 mA), absolute value, V, at most	90
Interelectrode capacitance, pF:
input	46-56
output	9-13
transfer,at most	0.09
Cathode heating time (at heater voltage 12.6 V, anode voltage 1,000 V, grid 2 voltage 300 V), s, at most	150
Output power under conditions of class AB1 (at anode voltage 2,000 V, grid 2 voltage 300 V, grid 1 voltage -60 V, grid 2 current at most 50 mA, frequency 0.1-1.0 MHz), W, least	550
Relative level of combination components (at anode voltage 2,000 V, grid 2 voltage 300 V, grid 1 voltage -70 V, grid 2 current at most 50mA), dB:
third-order components, at most	-28
fifth-order components, at most	28
Output power under conditions of class  (at anode voltage 1,500 V, grid 2 voltage 275 V, grid 1 voltage -45 V, grid 2 current at most 60 mA), W, at least	500
Output power under conditions of class AB1 over 1,000 h of service, W, at least	440

Limit Operating Values
Heater voltage (AC or DC), V	11.9-13.3
Anode voltage, V:
DC	2,000
peak value	4,000
Grid 2 voltage (DC), V	300
Negative grid 1 voltage, absolute value, V	150
Cathode current mA:
DC component	750
peak value	2,500
Dissipation, W;
anode	600
grid 1	2
grid 2	15
Operating frequency, MHz	250

Averaged Anode Characteristic Curves:
U_f = 12.6V; U_g2 = 150V;
- — — P_{a max}

Averaged Anode Characteristic Curves:
U_f = 12.6V; U_g2 = 250V;
- — — P_{a max}

Averaged Anode Characteristic Curves:
U_f = 12.6V; U_g2 = 250V;
- — — P_{a max}

Averaged Anode Characteristic Curves:
U_f = 12.6V; U_g2 = 300V;
- — — P_{a max}

Averaged Characteristic Curves:
U_f = 12.6V; U_g2 = 250V;
_____ grid 2-anode;
_ _ _ grid 1-anode

Averaged Characteristic Curves:
U_f = 12.6V; U_g2 = 300V;
_____ grid 2-anode;
_ _ _ grid 1-anode

Averaged Characteristic Curves:
U_f = 12.6V; U_g2 = 250V;
_____ anode-grid;
_ _ _ grid

Averaged Characteristic Curves:
U_f = 12.6V; U_g2 = 300V;
_____ anode-grid;
_ _ _ grid