PET3CX20000H3

Drop-in equivalent of 3CX20000H3
Air Cooled Triode For Industrial RF Heating
  • Power Triode Tube Valve
  • Output Power: 63 kW
  • Anode voltage: 12 kV max
  • Anode dissipation: 20 kW max
  • Frequency: 90 MHz max
  • Warranty: 12 months irrespective of number of hours in operation
  • Condition: Brand New
  • Price: Please call +91-9815309603 or email: [email protected]
Superior quality at a lower price with unmatched warranty of 52 weeks with no restriction on the number of hours of operation.
​Manufactured in India, in a world-class facility equipped with high quality machinery, materials and components sourced from reputed suppliers in America, Europe and Japan.

Data Sheet of 3CX20000H3 / PET3CX20000H3

3CX20000H3 is a forced- air cooled, ceramic-metal power triode with a robust mesh filament for use in industrial radio-frequency heating
 
Electrical Characteristics of 3CX20000H3 
Filament            .           .           .           .           .           thoriated tungsten
Filament voltage (see note 1)     .           .           .      10.0              V
Filament current            .           .           .           .        160              A
Surge Filament current (peak) (see note 2)         .  800              A
Filament cold resistance .           .           .           .      6.8            mΩ
Peak usable cathode current      .           .           .    50              A
Amplification factor       .           .           .           .        20
Inter – electrode capacitances:
Grid to anode    .           .           .           .           .          46             pF
Grid to filament             .           .           .           .         77             pF
Anode to filament          .           .           .           .        2.1            pF
 
Mechanical Characteristics of 3CX20000H3 
Connections      .           .           .           .           .          Filament leads and grid contact flanges
Operating position         .           .           .           .        Vertical, either way up
Maximum operating temperature            .           .   250            degree C
Maximum dimensions    .           .           .           .        See outline drawing
Net weight         .           .           .           .           .           9 kg (10 pounds) approx
 
Accessories of 3CX20000H3 
Cathode connector        .           .           .           .         CWPA830
For frequencies above 2MHz, CWPA830 should be used in conjunction with a strip connection to provide a low inductance cathode return.
 
Cooling
Sufficient air must be passed through the radiator to keep the temperatures of ceramic to metal seals and of the anode (measured next to the radiator) below the maximum rated value of 250 degree C. The air flows required to maintain seal temperature at 225 degree C in an ambient temperature of 50 degree C and with an operating frequency of less than 30 MHz are shown in the following table.
 
An additional air flow is required for the filament seals. 100ft3/min directed at the centre contact ring, ½ inch below the outer contact ring, through a 1 ½ inch internal diameter air duct at 45 degree to the axis of the tube, is sufficient for operation up to 30 MHz at 50 degree C ambient and 10, 000 ft altitude.
 
Minimum Radiator Air Flow Requirements for 3CX20000H3
                                                Sea Level                                              10, 000 Feet     
                                                            Pressure                                                                       Pressure
    Anode                           Air                   Drop                               Air                              Drop
  Dissipation                    Flow                 inches                             Flow                            inches
     Watts                       ft3/min                Water                           ft3/min                            Water             
    10, 000                          320                   0.9                                464                               1.1
    15, 000                          625                   2.1                                910                               2.8
    20, 000                         1010                  4.3                               1475                              5.8

The values given allow for maximum filament and grid dissipation in addition to the anode dissipation shown.
 
The air cooling is assumed to flow over the grid seal* and through the radiator. If the air flows through the radiator towards the grid seal, 20% additional air flow should be provided as indicated by 33% higher pressure drop across the radiator.*
* Indicates a change

Radio Frequency Oscillator For Industrial Service
(Class C conditions, one tube)
Maximum Ratings of 3CX20000H3 (Absolute Values)
Frequency         .           .           .           .           .            90     MHz max
Anode voltage d.c.        .           .           .           .          12        kV max
Anode current d.c.(see note 3)   .           .           .      8.0         A max
Anode input power        .           .           .           .        80      kW max
Anode dissipation         .           .           .           .         20      kW max
Grid voltage d.c.           .           .           .           .          -2000        V max
Grid current d.c. .(See note 4)     .           .           .     1.5         A max
Grid dissipation .           .           .           .           .         750       W max
Cathode current d.c.      .           .           .           .       10.0       A max
 
Typical Operating Conditions of 3CX20000H3 
Frequency         .           .           .           .           .          30              30              MHz
Anode voltage d.c.        .           .           .           .         7.5           10.0              kV
Anode current d.c.         .           .           .           .        8.0             7.9                  A
Anode dissipation         .           .           .           .         9              14                kW
Grid voltage d.c.           .           .           .           .         -800         -900                  V
Grid resistor      .           .           .           .           .        570         1130               Ω
Grid current d.c. .           .           .           .           .      1.4            0.8               mA
Grid dissipation .           .           .           .           .        560            296              W
Drive power      .           .           .           .           .        1670           960              W
Anode input power        .           .           .           .     60              79               kW
Anode output power      .           .           .           .    51              65               kW
Output power less drive             .           .           .   49.3             64               kW
 
NOTES
  1. The filament voltage measured at the tube should be 10.0 V ± 5% for satisfactory performance, maximum life is obtained at -5% (9.5 V).
  2. The filament current of 3CX20000H3 must not exceed 800 A, even momentarily, at any time.
  3. Maximum anode voltage and current should not be applied simultaneously; this could result in excessive anode dissipation. The anode supply should include current-limiting resistors, and an over-current trip to remove anode voltage quickly in the event of an overload or arc (such load variations and faults are common in industrial services). Spark gaps should be connected between anode and ground, to protect the tube from voltage transients under fault conditions.
  4. The grid current rating of 1.5 A of d.c. should not be exceeded, except for very short periods during tuning. Normally, reasonable efficiency can be obtained with a grid current not exceeding 0.6 to 1.0 A. the grid circuit should include over-current protection, and d.c. grid current should be monitored continuously during industrial operation with varying loads.