GU94Ç
TETRODE
The GU94P tetrode provides linear amplification of singlesideband signals with output power 100 kW at frequencies up to 30 MHz and is designed for stationary use in RF equipment.
GENERAL
Cathode: directly heated, carbonized thoriated tungsten.
Envelope: metalceramic.
Cooling: evaporation for anode, forced air for other envelope elements.
Working position: upright with anode up.
Height: at most 535 mm.
Diameter: at most 221 mm.
Mass: at most 35 kg.
OPERATING ENVIRONMENTAL CONDITIONS  
Vibration loads:  
frequencies, Hz  135 
acceleration, m/s²  5 
Multiple impacts with acceleration, m/s²  147 
Ambient temperature, °C  155 
Relative humidity at up to 25 °C, %  98 
BASIC DATA Electrical Parameters 

Filament voltage (AC or DC), V  18 
Filament current, A  350420 
Negative cutoff voltage, absolute value (at anode voltage 2 kV, grid 2 voltage 1.5 kV, anode current 0.1 A), V, at most  350 
Anode current (at anode voltage 2.5 kV, peak grid 2 voltage 1.5 kV, grid 1 voltage 0), A, at least  38 
Mutual conductance (at anode voltage 2 kV, grid 2 voltage 1.5 kV, anode currents 6 and 10 A), mA/V  110180 
Gain coefficient (at anode voltage 2 kV, grid 2 voltages 1.4 and 1.5 kV, anode current 10 A)  611 
Interelectrode capacitance in a groundedcathode circuit, pF:  
input  550650 
output  6077 
transfer  2.6 
Interelectrode capacitance in a groundedgrid circuit, pF:  
input  240300 
output  6077 
transfer, at most  0.35 
Limit Operating Values  
Filament voltage (AC or DC), V  18.5 
Anode voltage (DC), kV  15 
Grid 2 voltage, kV  1.8 
Filament starting current (peak value), A  800 
Dissipation, W:  
anode  1x10^{5} 
grid 2  2.5x10³ 
grid 1  500 
Operating fequency, MHz  30 
Envelope temperature (except for anode) at the hottest point, °C  175 
Averaged Emission Characteristic Curves
AveragedGrid Characteristic Curves:
U_{f} = 18V; U_{g2} = 1,500V
Averaged AnodeGrid Characteristic Curves:
U_{f} = 18V; U_{g2} = 1,500V