GI-21B(GI21B) Tube. 

Microwave Triode

The MICROWAVE (up to 3000 MHz)TRIODES GI21B(GI-21B) is manufactured in the "Soyuse" (UNION-eng.) factory in Novosibirsk,Russian Siberia.

See factory information:

GENERAL
GI21B(GI-21B) Cathode: indirectly heated, oxide-coated.
GI21B(GI-21B) Envelope:coaxial, metal-ceramic.
GI21B(GI-21B) 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.

GI21B(GI-21B) BASIC DATA
Electrical Parameters
Heater voltaqe: V 12.6
Heater current, A 0.83-0.93
Mutual conductance (at anode voltage, 600 V, grid voltage change 0.5 V, anode current 75 mA), mA/V 23-34
Penetration factor (at anode voltage 600 V, anode voltage change -200 V, anode current 75 mA), % 0.65-1.4
Cutoff voltage (at anode voltage 600 V, grid current 0.5 ?A), V 0 to -1.5
Interelectrode capacitance, pF:
Input 11.2-13.4
output, at most 0.05
transfer 2.7-3.4
Warm up time, s, at most 60

GI21B (GI-21B) Limit Operating Values
Heater voltage, V 11.35-13.85
Anode voltage, V:
DC in CW operation 800
DC with cold cathode 1,000
peak value: (with pulse duration at most 5 ?s) 5kV
Cathode current, A:
DC component CW operation 0.35
peak value: (with pulse duration at most 5 ?s) 4.5A
Dissipation:
anode:
with forced cooling: 150W
with no forced cooling 25W
grid: 2W
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

Notes: It is sceptical to read these factory data for Russian tubes.These tubes is designed in USSR in 1988 in the absence of any market. Product not need for advertisment. And manufacturer indicate double smaller  electrical parameters. This reduce its warranty responsiblity before federal or military consumer.

This sale is for GI21B(GI-21B) tube, NEW in Box.

Delivery to US buyers via Texas by 3-5 days!