GU63
TETRODE
The GU63 double tetrode is used as an oscillator and a power amplifier at frequencies up to 250 MHz
GENERAL
Cathode: indirectly heated, oxidecoated.
Envelope: glasstometal with cathode ring.
Mass: at most 40 g
1  grid 1 of second tetrode; 2, 4 heater; 3  cathode; 5  grid 1 of first tetrode; 6  grid 2; A1  anode of first tetrode  top cap; A2  anode of second tetrode  top cap; Ê  cathode; I  snap leads
OPERATING ENVIRONMENTAL CONDITIONS  
Vibration loads:  
frequencies, Hz  51,000 
acceleration, m/s²  9825 
Multiple impacts with acceleration, m/s²  343 
Single impacts with acceleration, m/s²  4,900 
Linear bads with acceleration, m/s²  980 
Ambient temperature, °C  65 to +70 
Relative humidity at up to +40 °C, %  9598 
BASIC DATA Electrical Parameters 

Heater voltage (AC or DC), V  6.3 
Heater current, mA  630750 
Anode voltage (DC), V  150 
Grid 2 voltage (DC), V  250 
Anode current (at grid 1 voltage 0 of first tetrode and 75 V of second tetrode), mA  50120 
Mutual conductance (at grid 1 voltage 16V of first tetrode and 75 V of second tetrode), mA/V  1.83.8 
Grid 1 reverse current (at heater voltage 7 V, anode voltage 400 V, anode current 30 mA), µA, at most  1 
Oscillatory power (at anode voltage 300 V, grid 1 voltage 60 V of first and second tetrodes, drive voltage about 110V, anode current 80 mA, grid 2 voltage about 12 mA, at 200 MHz), W, at least  11 
Warm up time, s, at most  30 
Vibronoise voltage (at resistance 2 kOm in anode circuit), mV (r.m.s.):  
at frequencies 501,000 Hz  1,500 
at frequencies 1,0002,000 Hz  2,000 
Interelectrode capacitance, pF:  
input, at most  7.09.6 
output, at most  1.32.6 
transfer, at most  0.1 
Limit Operating Values  
Heater voltage (AC or DC), V  5.77 
Anode voltage (DC), V  700 
Grid 2 voltage (DC), V  300 
Grid 1 voltage (DC), V  200 
Drive voltage, V  110 
Dissipation, W:  
anodes  13 
grid 2  3 
grid 1  0.5 
Anode current (DC component), mA  40 
Voltage between cathode and heater, V  150 to +150 
Averaged Anode Characteristic Curves (Each Tetrode):
U_{f} = 6.3V; U_{g2} = 200V
Averaged Anode Characteristic Curves (Each Tetrode):
U_{f} = 6.3V; U_{g2} = 250V
Averaged Anode Characteristic Curves (Each Tetrode):
U_{f} = 6.3V; U_{g2} = 300V
Averaged GridAnode Characteristic Curves (Each Tetrode):
U_{f} = 6.3V; U_{g2} = 200V
Averaged GridAnode Characteristic Curves (Each Tetrode):
U_{f} = 6.3V; U_{g2} = 200V
Averaged GridAnode Characteristic Curves:
U_{f} = 6.3V; U_{g2} = 250V
Averaged GridAnode Characteristic Curves (Each Tetrode):
U_{f} = 6.3V; U_{g2} = 250V
Averaged GridAnode Characteristic Curves (Each Tetrode):
U_{f} = 6.3V; U_{g2} = 300V
Averaged GridAnode Characteristic Curves (Each Tetrode):
U_{f} = 6.3V; U_{g2} = 300V
Averaged AnodeGrid Characteristic Curves:
U_{f} = 6.3V; U_{a} = 200V
_____ I_{a};
   I_{g2};
 .  I_{g1}
Averaged AnodeGrid and Grid Characteristic Curves (Each Tetrode):
U_{f} = 6.3V; U_{a} = 700V;