GS-36b
Tetrode

The GS-36B tetrode is designed for power amplification in distributed-gain amplifiers and single-sideband signal amplifiers at frequencies up to 75 MHz, and for power amplification at up to 500 MHz in RF equipment.  The GS-36b tetrode is generally considered to be similar to the 4CX400A.


GENERAL
Cathode:  indirectly heated, dispenser, oxide-coated.
Envelope:  metal-ceramic.
Cooling:  forced air.
Height, mm, at most: 67
Diameter, mm, at most: 51
Mass, gm, at most 220

GS-36b  
GS-36b
A - anode; I - contact surfaces; C1 - grid 1; 1 & C2 - grid 2; 2, 4, 6, 8 - cathode; 3, 7 - heater

ENVIRONMENTAL OPERATING CONDITIONS

Vibration loads:

frequency, Hz 1-600
acceleration, m/s² 100
Multiple impacts with acceleration, m/s² 400
Single impacts with acceleration, m/s² 1,500
Linear loads with acceleration, m/s² 25
Ambient Conditions:
Temperature, °C -60 to +85
Relative humidity at up to +35 °C, % 98

NOMINAL ELECTRICAL PARAMETERS
Heater voltage, V 6.3
Heater current, A 2.15
Mutual conductance (Va = 1KV, Vg2 = 325V, Ia = 400mA, change in Vg1 = 2.5V), mA/V: 26
Anode current (Ia) with Va = 350V, Vg2 = 325V, A: >0.4
Negative bias (Vg1) with Va = 1KV, Vg2 = 325V, Ia = 400mA, V: 7-22
Negative cutoff bias (Vg1) with Va = 2KV, Vg2 = 325V, Ia = 20mA, V: 60
input capacitance, pF 24
output capacitance, at most, pF 7
transfer capacitance, pF <0.08
Warm up time, s: <90
AB1 Output power, Va = 2KV, Ia < 25mA, Vg2 = 325V, Ig1<2x10-3 mA, Freq. 0.1-1.0 MHz, W: >250
3rd-order energy relative to carrier, Va = 2KV, Vg2 = 325V, dB: -30
5th-order energy relative to carrier, Va = 2KV, Vg2 = 325V, dB: -30
Designed Tube Life (hours) >1000

ELECTRICAL PARAMETER LIMITS
Heater voltage, V 6-6.6
Heater current, A 2.95-3.35
input capacitance, pF 18-30
output capacitance, pF 5-9
Maximum CW Anode voltage (Va), KV: 2.1
Maximum Instantaneous value Anode voltage (Va), KV: 4
"Maximum" Control Grid voltage (Vg1), V -60
Maximum Screen Grid voltage (Vg2), V 325
CW cathode current (Ic), A: 0.4
Anode Dissipation, W: 400
Screen Grid (G2) Dissipation, W: 8
Control Grid (G1) Dissipation, W: 0.2
Temperature at envelope (hottest point), °C 200
Frequency, MHz: <500

gs-36
gs-36b

gs-36b
Averaged Anode Characteristic Curves:
Uf = 6.3V; Ug2 = 325V

gs-36b
Averaged Anode Characteristic Curves:
Uf = 6.3V; Ug2 = 325V;
_______ Ia; - - - - Pa max
gs-36
gs-36b