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PERFORMANCE SPECIFICATION SHEET ELECTRON TUBE, NEGATIVE GRID (MICROWAVE) TYPE / - PDF
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1 INCH-POUND MIL-PRF-1/1757B 18 October 2002 SUPERSEDING MIL-PRF-1/1757A(NAVY) 5 September 1997 PERFORMANCE SPECIFICATION SHEET ELECTRON TUBE, NEGATIVE GRID (MICROWAVE) TYPE / This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring the electron tube described herein shall consist of this document and the latest issue of MIL-PRF-1. DESCRIPTION: Triode, planar, ceramic and metal. See figure 1. Mounting position: Any. Weight: 2.5 ounces (71 grams) nominal. ABSOLUTE RATINGS: Parameter: Unit: CW Osc or Amp: Anode pulsed Osc or Amp: Grid pulsed Osc or Amp: F MHz 2,500 3,000 3,000 Ef 2/ V 6.0 ± 5% 6.0 ± 5% 6.0 ± 5% Eb V dc 1,000 2,500 epy kv 3.5 Ec V dc Ik ma dc Ib ma dc ib a Ic ma dc Test conditions: 6.0 1,000 Adj 100 ABSOLUTE RATINGS: Parameter: Unit: CW Osc or Amp: Anode pulsed Osc or Amp: Grid pulsed Osc or Amp: Du Pp W Pg 3/ W tk sec (min) TE ºC 4/ T (Anode shank) ºC 4/ Test conditions: 300 6/ 1/ Formerly Y ic a Cooling 4/ 5/ 2/ The transit-time heating effect of the cathode may have to be compensated for by a reduction in the heater voltage after dynamic operation of the tube has started. This back heating is a function of frequency, grid current, grid bias, anode current, duty cycle, and circuit design and adjustment. There is an optimum heater voltage which will maintain the cathode at the correct operating temperature for any particular set of operating conditions. A maximum variation of ±5 percent from optimum is permitted. No reduction in heater voltage is required up to 500 MHz. 3/ The maximum instantaneous peak grid voltage for CW ratings shall be within the range of +30 and -400 volts; for pulse service within the range of + to -750 volts tp µs AMSC N/A 1 of 9 FSC 5960 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
2 4/ Sufficient conduction, convection, or forced-air cooling shall be provided for the anode shank and all seals to limit the maximum temperature to the specified value under all operating conditions. Where emphasis is placed on long and reliable life, lower temperatures should be maintained. 5/ With an anode dissipation of 100 watts and with an incoming air temperature of 25ºC maximum at seal level a minimum airflow of 12.5 cfm shall be directed across the anode cooler, using the cowl. 6/ In all electrical tests involving application of heater voltage, conduction, convection, and/or forced-air cooling may be used to assure operation within the maximum rated temperature limits. GENERAL: Qualification - Required. Compatibility testing - Required (In addition to the requirements specified herein, compatibility testing shall be required in the AN/URN-3 and AN/GRN-9 equipments. A sample of 20 tubes shall be supplied to Naval Air Test Center (NESTED), Patuxent River, Maryland 20670, on a noninterference basis, to be tested for adequate gain and tuning capability, and good tracking, in both low and high band heads. Also, of the 20 tubes supplied, a sample of four tubes shall be selected for life testing. Each tube shall achieve a minimum of 500 hours operation. In the event of no failures, the sample shall be considered as acceptable when a total of 1,600 hours has been accumulated. 2
3 TABLE I. Testing and Inspection. Inspection Method Conditions Symbol Limits Unit Min Max Conformance inspection, part 1 1/ Heater current 1301 If A Electrode voltage (1) (grid) 1261 Ec V dc Total grid current 1266 Ic -8.0 µa dc Insulation of electrodes 1211 Eb = Ek = 0; Ec = -500 V dc Rgk 50 Meg ohm Pulsing emission 1231 eb = ec = etd/is = 6.0 a; tp = 3 µs (max); prr = 600 (max) etd 200 V Conformance inspection, part 2 Electrode voltage (2) (grid) 3/ 1261 Ec/Ib = 1.0 ma dc Eco V dc Direct-interelectrode capacitance (grounded cathode connection) 1331 Fixture in accordance with Drawing 158-JAN Cin Cgp Cout pf pf pf Resonance 4/ No voltages Power gain 2/ F= 1,100 ±50 MHz; Ebb = 2,200 V dc; Ecc = -45 V dc; tp = 3 µs (min); Du = (min); pd = 400 w (peak) G 6 db Conformance inspection, part 3 Life test 5/ Group C; Ef = 6.0 V; filament standby; t = 500 hours Life-test end point 5/ ib Cgp % pf Variable-frequency vibration 6/ 7/ 1031 F = 55 to 500 to 55 Hz; Accel = 10 G peak (min); Ebb = 300 V dc; Rp = 10,000 ohms; Ec/Ib = 10 ma dc Ep mv ac Barometric pressure, reduced 6/ 9/ See footnotes at end of table Pressure = 35 mmhg (max); voltage = 1,800 V ac; TA = 30º± 10ºC 3
4 TABLE I. Testing and inspection - Continued. Inspection Method Conditions Symbol Limits Unit Min Max Conformance inspection, part 3 Torque 6/ 8/ No voltages Shock, specified pulse 6/ 1042 Condition A; no voltages; fixture Torque and shock test end point: Total grid current 1266 Ic -10 µa dc 1/ All tests listed under conformance inspection, part 1, shall be performed at the conclusion of the holding period. 2/ Test shall be conducted in a power amplifier cavity as shown on figure 2. Driving power is defined as the net power delivered to the amplifier cavity input terminals and the reflected power shall be subtracted from the incident power to obtain the net driving power. The output tuning shall be adjusted for maximum power output. 3/ The electrode voltage (2) grid test may be performed alternately in the following manner: Eb = 600 V dc; Ec/Ib = 1.0 ma dc; and the limit for Eco shall be V dc (max). 4/ Grid-anode resonance. Test in cavity. Cavity shall resonate at 1,354 ±2.0 MHz with tuning slug at TA = 25±5ºC. Grid-cathode resonance. Test in cavity. Cavity shall resonate at 1,719 ±2.0 MHz with tuning slug at TA = 25±5ºC. When plotted on graphs of resonant frequency versus grid-anode capacitance and resonant frequency versus grid-cathode capacitance, the tube under test shall be represented by a point within a parallelogram whose four corners are located by the following points: Points Capacitance (pf) Frequency (MHz) C-gp C-gk F-gp F-gk ,035 2,075 1,940 1,980 1,740 1,770 1,705 1,735 5/ At zero hours, establish the drive conditions necessary to obtain ib = 2.0a (peak anode current) with Eb = 1,000 V dc and a bias voltage Ec = -40 V dc. the pulse width (tp) of the modulator shall be 2 µs minimum and the duty (Du) shall be maximum. With the drive level determined at zero hours, check the anode current at end of life and measure Cgp. ib and Cgp may not exceed the specified limits. 4
5 TABLE I. Testing and inspection - Continued. 6/ Use a sample of 4. 7/ The tube shall be mounted in a socket and vibrated with simple harmonic motion. The peak acceleration over the frequency range shall be within ±20 percent of the reference acceleration at 100 Hz. The frequency shall vary from 55 to 500 Hz and return to 55 Hz with approximate logarithmic progression, and shall require 4 minutes minimum, 6 minutes maximum, to traverse the range. Each tube shall be vibrated for 30 minutes in each axis X and Z, except that if the cumulative result of tests on 50 or more tubes of a construction show that more than 75 percent of the tubes have higher output voltages in one axis, subsequent measurements need be taken only in the axis giving the higher reading. The voltages specified herein shall be applied to the tube during vibration. The value of the alternating voltage, Ep, produced across the resistor, Rp, as a result of vibration shall be measured with a suitable device. This device shall have an appropriate voltage range and shall have the ability to measure with an error of less than 10 percent the rms value of a sine wave of voltage at all frequencies from 20 to 20,000 Hz. The value of the vibrational output, Ep, shall not exceed the limit specified herein at any point in the sweepfrequency range during the last complete cycle of vibration. 8/ The torque test procedure shall be as follows: (a) A torque of 15 inch-pounds shall be applied between the anode contact surface and the cathode without perceptible shock. (b) A torque of 40 inch-pounds shall be applied between the anode contact surface and the grid without perceptible shock. 9/ The applied voltage shall be 60 Hz, between the anode and grid. No other voltages shall be applied. There shall be no evidence of failure as indicated by arc-over. 5
6 FIGURE 1. Outline drawing of electron tube type
7 Dimensions Ltr Notes Millimeters Inches Conformance inspection, part 2 Min Max Min Max A B C D F G J N , 10, 11 R , 10, 11 T , 7, 10, 11 U , 7, 10, 11 Conformance inspection, part 3 (See 6/ of table I) E H K L M P Q S V W 2.54 RAD RAD Electrode contact areas 2 AA AB AC AD AE 0.89 RAD RAD AF FIGURE 1. Outline drawing of electron tube type Continued. 7
8 NOTES: 1. Insulation material between heater and heater-cathode shall be securely affixed. 2. Dimensions in electrode contact area table are for socket design purposes and are not intended for inspection purposes. 3. Silver plated 30 MSI minimum. 4. Plating not required over radiator and radiator support of copper, aluminum, or approved equivalent. 5. This surface shall be used for measurement of anode shank temperature. 6. Holes for tube extractor through top fin only. 7. Inner edge of heater and outer edge of cathode rf connection shall be free from burrs and sharp edges. 8. This fin shall withstand a 6-inch (153 mm) drop test without loosening and without distortion as judged by ability to maintain dimension K. 9. Distortion of fins permissible provided distance between adjacent fins at any point on circumference meets tolerances for dimension K. 10. Eccentricity of contact surfaces shall be gauged from center line of reference and shall be as follows: Contact surface TIR maximum Reference Anode Cathode Grid Cathode Heater Cathode 11. Diameters N, R, T, and U shall apply throughout entire contact areas as defined by dimensions AA, AB, AC, and AD respectively. 12. This surface shall not be used for clamping or locating. FIGURE 1. Outline drawing of electron tube type Continued. 8
9 LTR MILLIMETERS INCHES LTR MILLIMETERS INCHES A F B G C H D J E K FIGURE 2. Pulse amplifier cavity. Custodians: Preparing activity: Navy - EC DLA - CC DLA - CC (Project ) Review activities: Navy - AS, CG, OS, SH 9
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