GU-33 B

TETRODE

The GU-ÇÇB tetrode is designed to operate for wide-band power amplification at frequencies up to 500 MHz in RF equipment.

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: glass-to-metal.
Cooling: forced air.
Height: at most 85 mm.
Diameter: at most 50 mm.
Mass: at most 220 g.

KP - cathode and heater; P - heater; C2 - grid 2; C1 - grid 1; A - anode

Negative cutoff voltage (at anode voltage 1,000 V, grid 2 voltage 300 V, anode current 5 mA), V (absolute value), at most

BASIC DATA Electrical Parameters
Heater voltage, V	6.3
Heater current, A	4.7-5.6
Mutual conductance (at anode voltage 400 V, grid 2 voltage 300 V, anode current 375 mA), mA/V	20-32
Gain coefficient (at anode voltage 400 V, grid 2 voltage 300 V, anode current 375 mA)	13
Negative bias voltage (at anode voltage 400 V, grid 2 voltage 300 V, anode current 375 mA), V (absolute value), at most	2-12
60
Interelectrode capacitance, pF:
input, at most	36-46
output, at most	7-10
transfer, at most	0.1
Output power, W, min.:
at 50-60 MHz, anode voltage 1 kV, grid 2 voltage 250 V, grid 1 voltage 40 V, drive voltage 52 V peak value, grid 2 current almost 40 mA, anode dissipation at most 150 W, grid 1 dissipation at most 2 W)	120
over 1.500 h of service	105
Warm up time (at anode voltage 400 V and grid 2 voltage 300 V) mm at most	2.5

Limit Operating Values
Heater voltage, V	5.7-6.9
Anode voltage (DC), V	1500
Grid 2 voltage, V	400
Cathode current (DC component), mA	340
Cathode current under conditions of class Â, mA (peak value)	1000
Dissipation, W:
anode	150
grid 1	2
grid 2	10
Operating freguency, MHz	500
Temperature at anode, stem and glass-to-metal seals, °C	150

Averaged Anode Characteristic Curves
U_f = 6.3V; U_g2 = 300V

Averaged Grid-Anode Characteristic Curves
U_f = 6.3V; U_g2 = 300V

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