Specification :

The 4CX3500A is a compact tetrode designed to
be used in VHF power amplifier service. It features
a type of internal structure which results in
high RF operating efficiency up to 220 MHz. This
tube is also recommended for use as a VHF TV
linear amplifier. for use as a Class C radio frequency
power amplifier and plate-modulated, radio
frequency power amplifier.
Characteristics:
Plate Dissipation ( Max.) 3, 500 Watts
Screen Dissipation ( Max.) 162 Watts
Grid Dissipation ( Max.) 50 Watts
Frequency for Max. rating ( CW) 220 MHz
Amplification Factor 4.5
Filament/ Cathode Thoriated Tungsten
Voltage 5.0 Volts
Current 90 Amps