GS27B
TETRODE
The GS27B tetrode is used for RF voltage amplification in groundedgrid circuits in RF equipment.
GENERAL
Cathode: indirectly heated.
Envelope: metalceramic.
Cooling: forced air.
Height: at most 72 mm.
Diameter: at most 37.3 mm.
BASIC DATA Electrical Parameters 

Heater voltage, V  11.413.8 
Heater current, A  1.041.24 
Mutual conductance, mA/V, at least  10 
Peak cathode emission current, A, at least  5 
Inverse grid 1 current, µA, at most  20 
Output power, W, at least  40 
Interelectrode capacitance, pF:  
grid 1cathode  69 
grid 2anode  23.5 
Limit Operating Values  
Heater voltage, V  11.413.8 
Maximum anode dissipation, W  100 
Maximum grid 1 dissipation, W  2 
Maximum grid 2 dissipation, W  2 
Maximum anode voltage, V  650 
Maximum instantaneous anode voltage, V  1,800 
Maximum grid 2 voltage, V  200 
Maximum instantaneous grid 2 voltage, V  300 
Bias voltage, V  50 to 0 
Maximum anode current, mA  210 
Maximum grid 1 current, mA  30 
Grid 2 current (at grid 2 voltage not above 130V), mA  17 to +17 
Warm up time, s, at most  60 
Maximum operating frequency, MHz  1,000 
Maximum envelope temperature, °C  200 
Averaged AnodeGrid and Grid Characteristic Curves:
U_{f} = 12.6V; U_{a} = 1,000V;
_____ I_{a};
_ _ _ I_{g1}
Averaged Anode and GridAnode Characteristic Curves:
U_{f} = 12.6V; U_{g2} = 200V;
_____ I_{a};
_ _ _ I_{g1};
 .  I_{g2}