The 4CX3500A is a metal-ceramic, forced air-cooled coaxial tetrode with a direct-heating thoriated tungsten cathode and a squirrel cage-shaped grid structure. At an operating frequency of 220MHz, the anode dissipation power is 3500W. Dissipation power for grid No.1 and No.2 is 50w and 165w respectively. The tube is mainly used in FM broadcasting and RF linear power amplifier and VHF TV linear power amplifier.
Specifications: (*:approx. value, #: loaded power)
Filament Voltage……5V
Filament Current……76A
Grid2 Current DC*……140 123mA
Grid1 Current DC*……84 63mA
Amplification Factor……4.3
Interelectrode Capacitances (cathode-grounded)
Input……111pF Feedback……0.5pF Output……12Pf
Drive Power*……56 66W
Effective output power*#......3838 5531W
Power Gain*……18.4 19.2dB
Weight……2.5 kg, Height……184.2mm, Maximum Diameter…… φ125.5mm
Mounting……Upright
Cooling……forced air
Minimum cooling air input……6.82m3/ min
Shell Temperature……250℃
Air input temperature……≤40℃
Maximum ratings:
Frequency……220MHz
Anode voltage...6kV
Anode current...2A
Grid 1 voltage……-500V
Grid 1 dissipation……50w
Grid 2 voltage……1500V
Grid 2 dissipation……165w
Anode dissipation power...3500W
Typical conditions
Frequency……100.5MHz
Anode voltage......4000 5000V
Grid 1 voltage……-300 -400V
Grid 2 voltage……500 700V
Anode current……1.5 1.9A
