Description
BW1607J2F is a water cooled power triode of coaxial ceramic-metal construction. It is intended primarily for industrial R.F. heating machines.
Electrical Characteristics of BW1607J2F
Filament: Thoriated tungsten
Filament voltage (see note 1): 7.5 V
Filament current: 100 A
Filament cold resistance: 9.0 mΩ
Peak usable cathode current: 28 A
Perveance: 4.3 mA/V³/²
Amplification factor (Va = 2.25 kV, Ia = 1.0 A): 23
Mutual conductance (Va = 2.25 kV, Ia = 1.0 A): 40 mA/V
Inter-electrode capacitances:
Grid to anode: 36 pF
Grid to filament: 74 pF
Anode to filament: 2.0 pF
Mechanical Characteristics of BW1607J2F
Overall dimensions: See outline drawing
Net weight: 3.3 kg (7.3 pounds) approx
Mounting position: Vertical, either way up
Accessories
Water coupling with BW1607J2F: PA323A
Thermal fuse, available for BW1607J2F: PA85E
Cathode Connector: PA830
Note: For frequencies above 2 MHz, PA830 should be used in conjunction with a strip connection to provide a low inductance cathode return.
Cooling
BW1607J2F has an integral water jacket. Minimum water cooling requirements are shown on page 6, higher rates of flow should be used where possible. The water pressure in the jacket must not exceed 6 bar.
A thermal fuse, part number PA85E (melting point 103 ⁰C), is available for BW1607J2F to give protection against anode overheating. Two fuses should be used for maximum protection, screwed into the holes indicated on the anode mounting plate (see page 8). The fuses should be connected by a non-conducting cord to a suitable switching device; a tension of about 1 pound (450 g) should be applied to the fuses via the cord. If the temperature exceeds the safe limit, one or both fuses will release and the fuse cord is pulled outwards; this should actuate the switching device and remove all electrical supplies to the tube. Replacement fuses can be supplied to order.
Filament and Grid Seals
The temperature of the filament and grid seals must not exceed 200 °C. A flow of air of 15ft³/min (0.43m³/min) directed onto the terminals via a 1-inch (25 mm approx) diameter nozzle from a distance of 6 inches before and during the application of any voltages is usually adequate for limiting the temperature of the seals.
Radio Requency Oscillator For Industrial Service
(Class C conditions, one tube)
Maximum Ratings (Absolute Values) of BW1607J2F
Anode voltage: 10 kV max
Anode current: 5.0 A max
Anode dissipation (continuous or intermittent service): 15 kW max
Grid voltage (negative value): –1.5 kV max
Off-load grid current: 1.6 A max
Grid dissipation: 600 W max
Frequency: 30 MHz max
Operating Conditions of BW1607J2F (At Maximum Anode Current)
| Anode Voltage | 9.5 | 9.0 | 8.0 | 7.0 | 6.0 kV |
| Grid voltage | -800 | -775 | -700 | -600 | -520 V |
| From grid resistor | 800 | 720 | 640 | 540 | 445 Ω |
| Peak R.F. grid drive voltage | 1150 | 1135 | 1050 | 940 | 860 V |
| Peak positive grid voltage | 350 | 360 | 350 | 340 | 340 V |
| Anode current | 5.0 | 5.0 | 5.0 | 5.0 | 5.0 A |
| Grid current | 1.0 | 1.08 | 1.1 | 1.12 | 1.17 A |
| Anode dissipation | 8.0 | 7.7 | 7.3 | 6.8 | 6.4 kW |
| Grid dissipation | 350 | 390 | 385 | 380 | 398 W |
| Driving power | 1140 | 1226 | 1155 | 1050 | 1006 W |
| Feedback ratio (see note 2) | 13.1 | 13.7 | 14.5 | 15 | 16.1 % |
| Anode output power | 39.0 | 37.1 | 32.7 | 28.2 | 23.7 kW |
| Anode efficiency | 83.1 | 82.7 | 81.6 | 80.6 | 78.7 % |
| Oscillator output power | 37.9 | 35.9 | 31.5 | 27.1 | 22.7 kW |
| Oscillator efficiency | 80.7 | 80.0 | 78.9 | 77.6 | 75.4 % |
| Load resistance | 980 | 920 | 805 | 700 | 600 Ω |
Operating Conditions of BW1607J2F (With Reduced Input Power)
| Anode voltage | 9.5 | 9.0 | 8.0 | 7.0 | 6.0 kV |
| Grid voltage | -800 | -775 | -700 | -600 | -520 V |
| From grid resistor | 1265 | 1225 | 1060 | 880 | 655 Ω |
| Peak R.F. grid drive voltage | 1075 | 1050 | 975 | 860 | 795 V |
| Peak positive grid voltage | 275 | 275 | 275 | 260 | 270 V |
| Anode current | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 A |
| Grid current | 630 | 630 | 660 | 685 | 790 mA |
| Anode dissipation | 5.3 | 5.1 | 4.7 | 4.6 | 4.1 kW |
| Grid dissipation | 174 | 174 | 180 | 177 | 218 W |
| Driving power | 680 | 665 | 645 | 587 | 630 W |
| Feedback ratio (see note 2) | 12.3 | 12.7 | 13.4 | 13.7 | 14.7 % |
| Anode output power | 28.2 | 26.1 | 23.2 | 20 | 17 kW |
| Anode efficiency | 84.2 | 83.7 | 83.0 | 81.3 | 80.8 % |
| Oscillator output power | 27.6 | 25.5 | 22.5 | 19.4 | 16.4 kW |
| Oscillator efficiency | 82.2 | 81.5 | 80.7 | 80.6 | 77.9 % |
| Load resistance | 1355 | 1300 | 1150 | 990 | 840 Ω |
Note:
1. BW1607J2F must be operated at the stated filament voltage. Fluctuation in filament voltage must not exceed ±5%. The filament may be switched on at its operating voltage and no surge limiting devices need be incorporated in the filament circuit. The voltage drop in the integral filament leads is less than 1% of the filament voltage.
2. The feedback ratio is defined as Vg(pk)/Va(pk) X 100 where Vg(pk) = peak R.F. grid voltage in volts and Va(pk) = peak R.F. anode voltage in volts.
3. Oscillator output power = Pout ― Pdrive
Where Pout = output power of tube to anode circuit
And Pdrive = drive power fed back to grid circuit.
