GI21B
(GI210)
TRIODE
The GI21 B (GI210) triode generates and amplifies RF oscillations in continuouswave or pulsed mode with anode modulation.
The triode is available in two variants differing in the type of cooling: the GI21 B has a heat sink and is designed for forced air cooling and the GI210 has no heat sink and requires other systems of cooling.
GENERAL
Cathode: indirectly heated, oxidecoated.
Envelope: metalceramic.
Cooling: forced air.
Height: at most 88.5 mm with heat sink, 78.7 mm with no heat sink.
Diameter: at most 45 mm with heat sink, 36.3 mm with no heat sink.
Mass: at most 120 g with heat sink, 60 g with no heat sink.
KP  cathode and heater; P  heater; C  grid; A  anode
OPERATING ENVIRONMENTAL CONDITIONS  
Vibration loads:  
frequencies, Hz  52,000 
acceleration, m/s²  98 
Multiple impacts with acceleration, m/s²  735 
Single impacts with acceleration, m/s²  4,900 
Linear loads with acceleration, m/s²  980 
Ambient temperature, °C  60 to +100 
Relative humidity at up to +40 °C, %  98 
BASIC DATA Electrical Parameters 

Heater voltaqe, V  12.6 
Heater current, A  0.830.93 
Mutual conductance (at anode voltage, 600 V, grid voltage change ±0.5 V, anode current 75 mA), mA/V  2334 
Penetration factor (at anode voltage 600 V, anode voltage change 200 V, anode current 75 mA), %  0.651.4 
Cutoff voltage (at anode voltage 600 V, grid current 0.5 µA), V  0 to 1.5 
Interelectrode capacitance, pF:  
Input  11.213.4 
output, at most  0.05 
transfer  2.73.4 
Warm up time, s, at most  60 
Output power, W, min.:  
51 heater voltage 10.7 V, anode voltage 300 V, cathode current 150 mA, wavelength at most 13 cm  22 
over 500 h of service  20 
Limit Operating Values  
Heater voltage, V  11.3513.85 
Anode voltage, V:  
DC in CW operation  800 
DC with cold cathode  1,000 
peak value (with pulse duration at most 5 µs)  5 
Cathode current, A:  
DC component CW operation  0.25 
peak value (with pulse duration at most 5 µs)  4.5 
Dissipation, W:  
anode:  
with forced cooling  110 
with no forced cooling  25 
grid  2 
Wavelength, cm:  
in CW operation, at least  10 
in pulsed operation, at least  9.5 
Cathode heating time, s, at least  60 
Anode temperature, °C  200 
Temperature at leads of cathode and grid, °C  140 
Resistance in grid circuit, kOm, at least  10 
Averaged Anode Characteristic Curves