The GU-91B tetrode is used for power amplification in traveling-wave and SSB amplifiers, and as a power amplifier in RF equipment.
General description
Cathode: indirectly heated, oxide-coated.
Envelope: metal ceramic.
Cooling: forced air.
Height: max. 95 mm.
Diameter: max. 72 mm.
Weight: max. 600 g.
Electrical Parameters
Heater voltage (AC or DC), V................................................................. 12.6
Heater current, A................................................................. 4.1-4.7
Anode voltage, V.................................................................................... 1600
Grid 2 voltage, V........................................................................................ 350
Negative bias voltage, absolute value (at Ia=1000 mA, Ua=1,600 V, Ug2=350 V), V. .....20-55
Negative cutoff voltage, absolute value (at Ua=2kV, Ug2=350 V, Ia=20 mA), V, (max.) ...130
Grid 2 current (at Ia=1000mA, Ua=1.6kV, Ug2=350 V), mA............................ -25...+10
Anode current at zero grid 1 voltage. A, at least ... 2.7
Mutual conductance (at Ia=1000mA, Ua=1.6kV, Ug2=350 V), mA/V................ 30-65
Relative level of combination components of third
and fifth orders (at Ua=2kV, Ug2=350 V, bias voltage corresponding to quiescent
anode current 500 mA, drive voltage equal to bias
voltage at frequencies 0.1-1 MHz), dB, at most . . . -32...-35
Output power under conditions of class В(at Ua=1.8kV, Ug2=350 V, bias voltage
corresponding to quiescent anode current 200 mA,
anode current DC component 200 mA at 250 ±25 MHz), W, at least..... 700
Interelectrode capacitance, pF:
input, max.................................................................. 86
output, max. .............................................................. 15
transfer, max............................................................................. 0.15
Limit Operating ValuesHeater voltage (AC or DC), V............................................ 12.0-13.2
Anode voltage, V:
DC................................................................................... 2000
peak value ....................................................................... 3750
Grid 2 voltage, V.................................................................. 350
Negative grid 1 voltage (DC, absolute
value), V................................................................................ 150
Cathode-heater voltage (either polarity,
absolute value), V................................................................ 100
Cathode current, mA:
DC component ............................................................................... 1400
peak value .................................................... 4500
Dissipation, W:
anode ............................................................................. 1600
grid 2............................................................................... 20
grid 1 .............................................................................. 0.1
Operating frequency, MHz ................................................ 250
Minimum cathode heating time, s.................................... 180
Minimum warm up time, s.................................................. 300
Envelope temperature (at hottest point), °C....................... 200
