GUÇÇA
TETRODE
The GUÇÇA tetrode is designed for continuous operation at frequencies up to 500 MHz in separateexcitation or selfexcitation oscillator circuits and is suitable for use in both stationary and mobile RF equipment
GENERAL
Cathode: indirectly heated, oxidecoated.
Envelope: glasstometal.
Cooling: liquid.
Height: at most 85 mm.
Diameter: at most 45 mm.
Mass: at most 130 g.
OPERATING ENVIRONMENTAL CONDITIONS  
Vibration loads:  
frequency, Hz  10200 
acceleration, m/s²  59 
frequency, Hz  200600 
acceleration, m/s²  20 
Multiple impacts with acceleration, m/s²  343 
Single impacts with acceleration, m/s²  1,470 
Ambient temperature, °C  10 to +55 
Relative Humidity at up to +25 S°, %  98 
BASIC DATA Electrical Parameters 

Heater voltage, V  6.3 
Heater current, A  4.75.6 
Mutual conductance iat anode voltage 400 V grid 2 voiiage 300 V grid 1 voltage change ±l kV anode current 375 mA), mA/V  2032 
Gain coefficient (at anode voltage 400 V grid 2 voltages 250 and 300 V, anode current 375 mA)  816 
Negative bias voltage (at anode voltage 400 V grid 2 voltage 300 V, anode current 375 mA/V (absolute value), at most  60 
Output power (at frequency 250 MHz, anode voltage 900 V grid 2 voltage 300 V, anode current at most 310 mA, grid 2 current 33 mA, anode dissipation, at most 150 W), W, at least  120 
Warm up time (at anode voltage 400 V grid 2 voltage 300 V, anode current 375 mA), s, at most  120 
Output power over 1000 h of service (at 5060 MHz, anode voltage 1.000 V grid 2 voltage 250 V grid 1 voltage 40 V, drive voltage 52 V grid 2 current at most 40 mA, anode dissipation at most 1 50 W grid 1 dissipation at most 2 W), W, at least  105 
Interelectrode capacitance, pF:  
input, at most  3444 
output, at most  710 
transfer, at most  0.1 
Limit Operating Values  
Heater voltage, V  5.76.9 
Anode voltage, V  1,500 
Grid 2 voltage, V  400 
Negative grid 1 voltage, V (absolute value)  200 
Cathode current (DC component), mA  340 
Cathode current under conditions of class B, mA (peak value)  1,000 
Dissipation, W:  
anode  150 
grid 2  10 
grid 1  2 
Operating frequency, MHz  500 
Temperature at seals, anode and stem, °C  150 
Averaged Characteristic Curves:
U_{f} = 6.3 V; U_{g2} = 0.3 kV;
_____ anode;
   grid 2anode;
— • — P_{a max}
Averaged GridAnode Characteristic Curves:
U_{f} = 6.3V;
_____ U_{g2} (0.25kV);
   U_{g2} (0.3kV)
Averaged AnodeGrid Characteristic Curves:
U_{f} = 6.3V; U_{a} = 1kV