GU-93 B

TETRODE

The GU-93B tetrode is used for RF power amplification at frequencies up to 250 MHz in general-purpose television transmitters.

GENERAL
Cathode: indirectly heated, oxide-coated.
Envelope: metal-ceramic.
Cooling: forced air.
Working position: any desired.
Height: at most 145 mm.
Diameter: at most 116 mm.
Mass: at most 3.5 kg.

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

BASIC DATA Electrical Parameters
Heater voltage (AC or DC), V	12.6
Heater current, A	9.5-12
Mutual conductance (at anode voltage 700 V, grid 2 voltage 400 V, anode current 3,000 mA), mA/V	75-125
Zero anode current (at anode voltage 700 V, grid 2 voltage 400 V, grid 1 voltage 0), A, at least	4
Negative cutoff voltage, absolute value (at anode voltage 4,000 V, grid 2 voltage 400 V, anode current 20 mA), V, at most	240
Interelectrode capacitance in agrounded-cathode circuit, pF:
input, at most	100
output, at most	20
transfer, at most	0.1

Limit Operating Values
Heater voltage (AC or DC), V	13.2-12
Anode voltage, V:
DC	3,800
instantaneous value	6,500
Grid 2 voltage (DC), V	450
Negative grid 1 voltage (DC, absolute value), V	250
Anode current, A:
DC component under conditions of class Â	2
instantaneous value in the sync pulse mode	9
Grid 1 current (DC component), mA	100
Dissipation, W:
anode	4,000
grid 2	20
grid 1	5
Operating frequency, MHz	250
Minimum cathode heating time, s	240
Temperature at hottest point of envelope, °C	200

Averaged Anode Characteristic Curves:
U_f = 12,6V; U_g2 = 400V

Averaged Characteristic Curves:
U_f = 12.6V; U_g2 = 400V;
_____ anode-grid;
_ _ _ grid 2;
_ . _ grid 1

Averaged Grid-Anode Characteristic Curves:
U_f = 12.6V; U_g2 = 400V