PET3CW20000H3

Drop-in equivalent of 3CW20000H3
Water Cooled Triode For Industrial RF Heating
  • Power Triode Tube Valve
  • Output Power: 28 kW (CW mode)
  • Anode voltage: 10 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 3CW20000H3 / PET3CW20000H3

3CW20000H3 is a water-cooled, ceramic-metal power triode with a robust mesh filament, for use in industrial radio-frequency heating
 
Electrical Characteristics 3CW20000H3
Filament            .           .           .           .           .   Thoriated tungsten
Filament voltage (see note 1)     .           .           7.5               V
Filament current            .           .           ..            100              A
Surge Filament current (peak) (see note 2)     500              A
Filament cold resistance .           .           .           9.7             mΩ
Peak usable cathode current      .           .          26                A
Amplification factor (Va = 2.3 kV, la = 1.0 A)      20
Mutual conductance (Va = 2.5 kV, la = 1.3 A)     31          mA/V
Inter – electrode capacitances:
Grid to anode    .           .           .           .                 39               pF
Grid to filament             .           .           .                 54               pF
Anode to filament          .           .           .                 2.0              pF
 
Mechanical Characteristics of 3CW20000H3
Connections      .           .           .           Filament leads and grid contact flange
Operating position         .           .         vertical, either way up
Maximum operating temperature    250   degree Centigrade
Maximum dimensions    .           .        See outline drawings
Net weight         .           .           .           4 kg (8.8 pounds) approx
 
Accessories of 3CW20000H3
Water coupling, supplied with 3CW20000H3     .           CWPA323A
Thermal fuse available for 3CW20000H3           .           PA85E
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
Anode of 3CW20000H3 is cooled by circulating water through the removable anode water jacket. The table below lists the minimum water flow requirement for adequate anode cooling at various anode dissipation levels. In all cases, the outlet water temperature must not exceed 70 ⁰C nor should inlet water pressure exceed 60 psi. This table is based upon 20 ⁰C temperature rise.
Additional forced-air cooling of the tube base is also required to maintain ceramic-to-metal seal temperature below the 250 ⁰C maximum. Approximately 50 ft3/min of cooling air directed into the base structure will generally satisfy requirements.
 
Minimum Water Cooling Requirements of 3CW20000H3
Anode                                                  Water                                                  Pressure
Dissipation                                          Flow                                                     Drop
(kW)                                                     l/min                                                     (psi)
10                                                         12                                                         2.5
15                                                         13                                                         3.0
20                                                         15                                                         3.5
25                                                         18                                                         4.0

The values given allow for maximum filament and grid dissipation in addition to anode dissipation shown.
 
Radio Frequency Oscillator For Industrial Service
(Class C Conditions, One Tube)
Maximum Ratings (Absolute Values)
Frequency         .           .                      90       MHz max
Anode voltage d.c.        .                     10       kV max
Anode current d.c. (see note 3)        4.0       A max
Anode input power        .                    40       kW max
Anode dissipation         .                     10       kW max
Grid voltage d.c.           .                    –1000  V max
Grid current d.c. .(See note 4)           0.6       A max
Grid dissipation .           .                    250      W max
Cathode current d.c.      .                   5.0       A max
 
Typical Operating Conditions of 3CW20000H3
Frequency         .           .           .        30         30        MHz
Anode voltage d.c.        .           .       7.0        9.0        kV
Anode current d.c.         .           .      4.0        4.0         A
Anode dissipation         .           .        9           7          kW
Grid voltage d.c.           .           .      –670     –930      V
Grid resistor      .           .           .      2450     2160       Ω
Grid current d.c. .           .           .    275       430        mA
Grid dissipation .           .           .      94         168         W
Drive power      .           .           .      260       570         W
Anode input power        .           .    28         36        kW
Anode output power      .           .   19         29        kW
Output power less drive .          .    18.7      28.4       kW
 
NOTES
  1. The filament voltage measured at the tube should be 7.5 V ± 5% for satisfactory performance, maximum life is obtained at -5%.
  2. The filament current of 3CW20000H3 must not exceed 500 A, even momentarily, at any time.
  3. 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 service). 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 0.6 A d.c. should not be exceed, except for very short periods during tuning. The grid circuit should include over-current protection, and d.c. grid current should be monitored continuously during industrial operation with varying loads.