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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