GS3A 
Tetrode 
The GS3A beampower tetrode amplifies RF power. It is rated
at 3KW anode dissipation through 800MHz. It is physically large, and is well suited for
amateur radio high power linear amplifiers through 432MHz! The design for a water cooling
jacket is HERE.

GENERAL  
Cathode: indirectly heated, oxidecoated.  
Envelope: metalceramic.  
Cooling: forced water.  
Height, at most (mm):  128 
Diameter, at most (mm):  91 
Mass, at most (gm):  800 
OPERATING ENVIRONMENTAL CONDITIONS  
Vibration loads:  
frequency, Hz  1200 
acceleration, m/s²  59 
Multiple impacts:  
acceleration, m/s²  392 
impact duration, ms  10 
Ambient temperature, °C   60 to +70 
Relative humidity at +35 °C,%  98 
BASIC DATA Electrical Parameters 

Heater voltage (AC or DC). V  26 
Heater current, A  3.13.8 
Mutual conductance (at anode voltage 1500 V, grid 2 voltage 600 V, grid 1 voltage change  10 V and anode current 1.5 A), mA/V  3050 
Gain coefficient (grid i gna 2) (at anode voltage 2,000 V, grid 2 voltage 500 V, grid 2 voltage change 50 V and anode current 1 A)  813 
Output power (at anode voltage 2,500 V, grid 2 voltage 500 V. anode current 2 A, driving power 250 V, wavelength 50 cm), kW, at least  2.2 
Interelectrode capacitance, pF:  
input  2634 
output, at most  0.07 
transfer  1723 
Limit Operating Values  
Heater voltage (AC or DC), V  23.427.3 
Heater starting current, A  5.6 
Anode voltage (DC), kV  2.7 
Grid 2 voltage, V  700 
Driving power, W  300 
Dissipation, W:  
anode  3x10^{3} 
grid 1  30 
grid 2  60 
Anode current (DC component), A  2.6 
Warm up time, s  120 
Operating frequency, MHz  300800 
Anode temperature, °C  110 
Temperature of cathode and grids, °C  150 
Averaged AnodeGrid Characteristic Curves, U_{1}=26 V, U_{a}=2.5 KV 
Averaged AnodeGrid Characteristic Curves, U_{1}=26 V, U_{a}=2.5 KV 