power grid tube 4CX3500A for VHF TV linear amplifier,Equivalent model FU-3500F

Introduction:
1. FU-3500F electron tube is a coaxial cermet tetrode with thorium carbide cathode and squirrel cage grid structure. The anode is forced air-cooled, the maximum operating frequency is 220MHz, the maximum anode dissipation power is 3500W, the maximum two grid dissipation power is 165W, and the maximum one grid dissipation power is 50W.
2. Mainly suitable for FM broadcasting, but also suitable for power amplification in radio frequency linear power amplifier and VHF TV linear power amplifier.
3. It can be used interchangeably with imported 4CX3500A electronic tubes.

Characteristic parameter
Filament Voltage……………5V     
Filament Current……………90A                                   
Amplification Factor…… 4.3      
Interelectrode capacitance（ cathode grounding）                                      
Input.at most …………………111pF      
Output.at most………………… 12pF                                   
Transter.at most………………0.5pF      
Weight……………………………2.5 kg    
Maximum Height………… 184.2mm                       
Maximum Diameter…… φ125.5mm   
Maximum temperature of shell……………………………250℃                     
Installation method…………Vertical, anode up or down
Cooling method………………………… Forced air cooling
Minimum cooling air volume……………≥6.82m3/ min
Maximum working temperature of inlet air…………………≤40℃
　　　
Extreme use data
Frequency………………………220MHz
Plate Voltage……………… 6kV
grid2 voltage DC……1500V
grid1 voltage DC……-500V
Plate Current…………………2A                                
Plate Dissipation… 3500W                         
Grid1 Dissipation…… 50W
Grid2 Dissipation……165W
　　　
Typical working status
Frequency  100.5MHz
Plate Voltage.......4000  4500  V
(grid2 voltage DC)......500   700  V
 grid1 voltage DC......-300  -400  V
　Plate Current.......5   1.9   A    
* Grid2 Current DC......140 123    mA
* Grid1 Current DC......84   63    mA
*  drive Power......56  66 W  
*#  Plate Output  Power.......3838  5531  W
* Power Gain......8.4  19.2  dB
“*”approximation
“#”Provide load power