Description
BR1617F is an Air-cooled R.F. power triodes of coaxial ceramic-metal construction. It is intended primarily for industrial R.F. heating machines.
Electrical Characteristics of BR1617F
Filament Thoriated tungsten (Mesh Type)
Filament voltage (see note 1) 6.3 Volts
Filament Current 160 Amps
Filament cold resistance 5.3 mΩ
Peak usable cathode current 30 Amp
Perveance 4.5 mA/V3/2
Amplification factor (Va = 2.25 kV, la = 1.0 A) 23
Mutual conductance (Va = 2.25 kV, la = 1.0 A) 40 mA/V
Inter-electrode capacitances:
Grid to anode 36 pF
Grid to filament 78 pF
Anode to filament 2.0 pF
Mechanical Characteristics of BR1617F
Overall dimensions See outline drawing
Net weight : 4.3 kg (9.5 pounds) approx
Mounting position Vertical, either way up
Accessories of BR1617F
Cathode Connector PA830
For frequencies above 2 MHz, PA830 should be used in conjunction with a strip connection to provide a low inductance cathode return.
Cooling of BR1617F
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 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 Frequency Oscillator For Industrial Service
(Class C Conditions, One Tube)
Maximum Ratings (Absolute Values) of BR1617F
Anode voltage 10 kV max
Anode current 6.0 Amp max
Anode dissipation (continuous service) 10 kW max
Grid voltage (negative value) –1.5 kV max
Off-load grid current 1.6 Amax
Grid dissipation 600 W max
Frequency 30 MHz max
Operating Conditions of BR1617F (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 RF Grid Drive Voltage | 1150 | 1135 | 1050 | 940 | 860 V |
| Peak Positive Grid Voltage | 350 | 350 | 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 | 380 | 380 | 398 W |
| Driving Power | 1150 | 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 (See note 3) | 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 BR1617F (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 RF 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 | 20.0 | 17.0 kW |
| Anode Efficiency | 84.2 | 83.7 | 83.0 | 81.3 | 80.8 % |
| Oscillator Output Power (See note 3) | 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 |
NOTES
1. BR1617F 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.
