Description
BR1606F is an air-cooled power triode of coaxial ceramic-metal construction. It is intended primarily for R.F. industrial heating machines.
Electrical Characteristics of BR1606F
Filament: Thoriated tungsten
Filament voltage: 6.6 V
Filament current: 100 A
Filament cold resistance: 8.0 mΩ
Peak usable cathode current: 25 A
Perveance: 4 mA/V³/²
Amplification factor (Va = 2.25 kV, Ia = 1.0 A): 24
Mutual conductance (Va = 2.25 kV, Ia = 1.0 A): 38 mA/V
Inter-electrode capacitances:
Grid to anode: 35 pF
Grid to filament: 67 pF
Anode to filament: 2.0 pF
Mechanical Characteristics of BR1606F
Overall dimensions: See outline drawing
Net weight: 4.3 kg (9.5 pounds) approx
Mounting position: Vertical, either way up
Accessories of BR1606F
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 of BR1606F
The required air flow should be delivered through the radiator immediately before and during the application of any voltages. Filament power, anode power and air flow may be removed simultaneously.
Filament and Grid Seals
The temperature of the filament and grid seals must not exceed 200 °C. A flow of air of 15 ft³/min (0.43 m³/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 Frequency Oscillator For Industrial Service (Class C conditions, one tube)
Maximum Ratings (Absolute Values) of BR1606F
Anode voltage: 10 kV max
Anode current: 4.5 A max
Anode dissipation (continuous service): 10 kW max
Anode dissipation (intermittent service): See page 7 of data sheet available in PDF
Grid voltage (negative value): –1.5 kV max
Off-load grid current: 1.7 A max
Grid dissipation: 600 W max
Frequency: 30 MHz max
Operating Conditions of BR1606F (At Maximum Anode Current)
| Anode Voltage | 9.5 | 9.0 | 8.0 | 7.0 | 6.0 kV |
| Grid voltage | -780 | -740 | -650 | -575 | -500 V |
| From grid resistor | 867 | 822 | 625 | 553 | 500 Ω |
| Peak R.F. grid drive voltage | 1125 | 1085 | 1000 | 915 | 830 V |
| Peak positive grid voltage | 345 | 345 | 345 | 340 | 330 V |
| Anode current | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 A |
| Grid current | 0.9 | 0.9 | 1.04 | 1.04 | 1.0 A |
| Anode dissipation | 6.9 | 6.9 | 6.1 | 5.8 | 5.4 kW |
| Grid dissipation | 319 | 326 | 364 | 353 | 300 W |
| Driving power | 1000 | 1000 | 1040 | 952 | 830 W |
| Feedback ratio (see note 2) | 12.8 | 13.1 | 13.4 | 14.2 | 15.2 % |
| Anode output power | 35.6 | 33.9 | 30.3 | 25.9 | 21.6 kW |
| Anode efficiency | 83.7 | 83.1 | 83.0 | 81.6 | 80.0 % |
| Oscillator output power (See note 3) | 34.6 | 32.9 | 29.2 | 24.9 | 20.8 kW |
| Oscillator efficiency | 81.4 | 80.6 | 80.2 | 78.6 | 76.9 % |
| Load resistance | 1088 | 1016 | 915 | 802 | 684 Ω |
Operating Conditions of BR1606F (With Reduced Input Power)
| Anode voltage | 9.5 | 9.0 | 8.0 | 7.0 | 6.0 kV |
| Grid voltage | -780 | -740 | -650 | -575 | -500 V |
| From grid resistor | 1560 | 1233 | 1083 | 958 | 714 Ω |
| Peak R.F. grid drive voltage | 1035 | 1000 | 905 | 830 | 760 V |
| Peak positive grid voltage | 255 | 260 | 255 | 255 | 260 V |
| Anode current | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 A |
| Grid current | 0.5 | 0.6 | 0.6 | 0.6 | 0.7 A |
| Anode dissipation | 4.5 | 4.1 | 4.0 | 3.6 | 3.2 kW |
| Grid dissipation | 130 | 145 | 144 | 156 | 180 W |
| Driving power | 530 | 556 | 513 | 507 | 524 W |
| Feedback ratio (see note 2) | 11.9 | 12.0 | 12.4 | 13.0 | 13.8 % |
| Anode output power | 24.1 | 23.0 | 20.3 | 17.4 | 15.0 kW |
| Anode efficiency | 84.4 | 84.8 | 83.4 | 83.0 | 82.6 % |
| Oscillator output power | 23.6 | 22.4 | 19.8 | 16.9 | 14.5 kW |
| Oscillator efficiency | 82.4 | 82.5 | 81.4 | 80.8 | 79.5 % |
| Load resistance | 1570 | 1495 | 1315 | 1180 | 1008 Ω |
Notes:
1. BR1606F 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) × 100, where Vg(pk) is the peak R.F. grid voltage in volts and Va(pk) is the peak R.F. anode voltage in volts.
3. Oscillator output power = Output power of tube to anode circuit and Pdrive = Drive power fed back to the grid circuit.
