GS23b 
Tetrode 
The GS23B power tetrode generates and amplifies power at up to 1,000 MHz in RF equipment. The
GS23b is generally considered to be similar to the 4CX1600U. Some of these tubes function
very well in the 23cm band; a limited sampling of about three dozen tubes shows approximately
one in six, (+/) will work at 1296MHz. The detailed description of a 23cm GS23B 1350W PA is
HERE. A means to water cool the
GS23B is HERE.

GENERAL  
Cathode: indirectly heated, oxidecoated.  
Envelope: metalceramic.  
Cooling: Forced Air (on with heater, off 5 min after shut down).  anode  190 m^{3}/hr 
cathode  20 m^{3}/hr  
Height, mm, at most:  120  
Diameter, mm, at most:  92  
Mass, Kg, at most  1.1 
A  anode; C1  grid 1; 1  heater; KP  cathode & heater; C2  grid 2; 
ENVIRONMENTAL OPERATING CONDITIONS  
Vibration loads: 

frequency, Hz  10200 
acceleration, m/s²  39 
Multiple impacts with acceleration, m/s²  342 
Ambient Conditions:  
Temperature, °C  60 to +50 
Relative humidity at up to +40 °C, %  98 
NOMINAL ELECTRICAL PARAMETERS  
Heater voltage, V  6.3 (5.7 @ 1GHz) 
Heater current, A  6.25 
Mutual conductance (V_{a} = 1.25KV, V_{g2} = 400V, I_{a} = 900mA), mA/V:  55 
Negative cutoff bias (V_{g1}) with V_{a} = 1.25KV, V_{g2} = 400V, I_{a} = 10mA, V:  47.5 
input capacitance, pF  33 
output capacitance, pF  11.5 
transfer capacitance, pF  <0.025 
Warm up time, s:  <210 
Designed Tube Life (hours)  >1000 
ELECTRICAL PARAMETER LIMITS  
Heater voltage, V, Nominal / @ 1 GHz  5.77 / 5.16.3 
Heater current, A  5.96.6 
Mutual conductance (V_{a} = 2.1KV, V_{g2} = 400V, I_{a} = 1A,), mA/V:  4070 
Average grid voltage (V_{g1}) with V_{a} = 1.25KV, V_{g2} = 400V, I_{a} = 900mA, V:  12 
Grid voltage (V_{g1}) with V_{a} = 1.25KV, V_{g2} = 400V, I_{a} = 900mA, V:  2 to 22 
Cutoff bias (V_{g1}) with V_{a} = 1.25KV, V_{g2} = 400V, I_{a} = 10mA, V:  30 to 65 
Maximum (absolute value) of negative Grid voltage (V_{g1}), V  150 
input capacitance, pF  2838 
output capacitance, pF  9.513.5 
Maximum CW Anode voltage (V_{a}), KV:  2.5 
Maximum Peak Anode voltage (V_{a}), KV:  3.5 
Maximum Pulsed (17% duty cycle) Anode voltage (V_{a}), KV:  4.5 
Maximum Screen Grid voltage (V_{g2}), V  500 
CW cathode current (I_{c}), A:  1.2 
Maximum pulsed (17% duty cycle) cathode current (I_{c}), A:  1.45 
Anode Dissipation, W:  1500 
Screen Grid (G2) Dissipation, W:  12 
Control Grid (G1) Dissipation, W:  1.5 
Temperature at envelope (hottest point), °C  200 
Frequency, MHz:  <1000 
Averaged Characteristic Curves 


Averaged Anode Characteristic Curves 