GS-15b
Tetrode

The GS-15B tetrode is used for wideband power amplification at frequencies up to 1000 MHz in RF equipment. In spite of its maximum frequency ratings, this tube produces in excess of 300W output at 23cm without any sign of thermal drift! Empirically gathered data initially indicating 23cm possibilities of the GS-15B is shown at HERE. A detailed description of how to build a high performance 23cm 300W GS-15B PA HERE. How to prepare the GS-15B for water cooling is HERE.

GENERAL
Cathode:  indirectly heated, oxide-coated.
Envelope:  metal ceramic
Cooling:  30 m3/hour forced air.
Height, mm, at most: 69
Diameter, mm, at most: 38.9
Mass, gm, at most: 140
GS-15b GS-15b pic
GS-15b
C1 - grid 1;   KP - cathode & heater;
P - heater;   C2 - grid 2;   A - anode

ENVIRONMENTAL OPERATING CONDITIONS

Vibration loads:

frequency, Hz 5-1400 / 1400-2500
acceleration, m/s² 98 / 146
Multiple impacts with acceleration, m/s² 342
Ambient Conditions:
Temperature, °C -60 to +100
Relative humidity at up to +40 °C, % 98

NOMINAL ELECTRICAL PARAMETERS
Heater voltage, V 6.3
Heater current, A 2
Mutual conductance (Va = 0.9KV, Vg2 = 250V, Vg1 = -10V, change in Vg1 = 1V), mA/V: 9
Negative bias (Vg1) with Va = 0.9KV, Vg2 = 250V, V: -17 to -2
control grid-cathode capacitance, pF 7
screen grid-anode capacitance, pF 1.9
Warm up time, s: <60
Designed Tube Life (hours) >2000

ELECTRICAL PARAMETER LIMITS
Heater voltage, V 6.0-6.6
Heater current, A 1.85-2.2
control grid-cathode capacitance, pF 6-8.5
screen grid-anode capacitance, pF 1.5-2.3
Maximum CW Anode voltage (Va), KV: 1.37
Maximum Anode Current (Ia), A: 0.24
"Maximum" Control Grid voltage range (Vg1), V -100 to 0
"Maximum" Control Grid current (Ig1), mA 40
Maximum Screen Grid voltage (Vg2), V 300
"Maximum" Screen Grid current range (Ig1), mA -10 to +10
Anode Dissipation, W: 200
Screen Grid (G2) Dissipation, W: 3
Control Grid (G1) Dissipation, W: 3
Temperature at envelope (hottest point), °C 200
Frequency, MHz: <1000

gs-15b
Averaged Anode Characteristic Curves 		gs-15b
Averaged Anode Characteristic Curves:
Uf = 6.3V; Ug2 = 300V; Ia = 240mA; L = 30cm

gs-15b
Averaged Anode Characteristic Curves:
Uf = 6.3V; Ua = 1.5KV 		gs-15b
Averaged Anode Characteristic Curves:
Uf = 6.3V; Ug2 = 300V;