1、AMSC N/A FSC 5960 INCH-POUND MIL-PRF-1/868F 18 June 2008 SUPERSEDING MIL-E-1/868E 17 March 1977 PERFORMANCE SPECIFICATION SHEET ELECTRON TUBE, NEGATIVE GRID (MICROWAVE) TYPE 2C40A This specification is approved for use by all Depart- ments and Agencies of the Department of Defense. The requirements
2、for acquiring the electron tube described herein shall consist of this document and MIL-PRF-1. DESCRIPTION: Planar triode, metal-glass. See figure 1. Mounting position: Any. Weight: 1.2 ounces (34 grams) nominal. ABSOLUTE RATINGS: CW OSCILLATOR Parameter: F Ef Eb Ib Ehk Ik Pp tk T(seal) Ec Ic Unit:
3、MHz V V mA dc V mA dc W sec C V dc mA dc Maximum: 3,370 6.6 500 25 90 33 6.5 - 200 -50 8.0 Minimum: - 6.0 - - - - - 60 - - - ANODE PULSED OSCILLATOR Parameter: F Ef eb ec Ehk Ib ib Ic ic Pp tp Du T(seal) Unit: MHz V v v V mA dc a mA dc a W s - C Maximum: 3,370 6.6 1,400 -100 90 3.0 2.0 1.5 1.0 4.0 1
4、.5 0.002 200 Minimum: - 6.0 - - - - - - - - - - - TEST CONDITIONS Parameter: Ef Eb Ck Rk tk Unit: V V F Ohms sec 6.3 250 1,000 200 300 GENERAL: Qualification Required. Holding period (MIL-STD-1311) t = 168 hours. - See note 1/. Inactive for new design after 21 July 1997 Provided by IHSNot for Resale
5、No reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/868F 2TABLE I. Testing and Inspection Limits Inspection Method MIL-STD-1311 Conditions Acceptance level note 8 Symbol Min Max Unit Conformance inspection, part 1 Pulse emission 1231 prr = 500; tp = 2.0 s; (eb=ec)/is = 2.5
6、 a 0.65 etd - 190 V Total grid current 1266 0.65 Ic - -0.5 A dc Power oscillation (pulsed) 1236 Rk = Rg = 0; eb = 1,400 v; tp = 1.0 s 10%; prr = 1,000 10%; Du = 0.001 10%; F = 3,000 MHz (min); ib = 1.5 a (max); t = 30 sec (min) see notes 2,3 and Dwg 209-JAN 0.65 Po starting voltage 200 - mW Transcon
7、ductance 1306 0.65 Sm 4,400 5,700 mhos Electrode current (anode) 1256 0.65 Ib 12 21 mA dc Conformance inspection, part 2 Insulation of electrodes 1211 E(g to all)= -100 V dc E(sh to all)=-500 V dc - R 100 - Meg Heater current 1301 - If 700 800 mA dc Electrode voltage (cutoff) (grid) 1261 Ec/Ib = 10
8、Adc - Eco - -26 V dc Heater-cathode leakage 1336 - Ihk - 50 A dc Power oscillation (cw) 1236 Eb = 250 V dc (max); Ib = 25 mA dc (max); Rg = 10,000 ohms; Rk = 0; F = 3,370 100 MHz; t = 30 sec (min) Dwg 102-JAN - Po 35 - mWDirect-interelectrode capacitance 1331 No voltages DESC Dwg 65025 - Cgp Cin Cou
9、t Cksh 1.20 2.00 - 50 1.40 2.45 0.030 200 pF pF pF pF Emission 1231 (Eb=Ec)/Is = 40 mA dc - Etd - 8 V dc Amplification factor 1316 - Mu 27 44 - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/868F 3TABLE I. Testing and Inspection Continued
10、Limits Inspection Method MIL-STD-1311 Conditions Acceptance level note 8 Symbol Min Max Unit Conformance inspection, part 3 Life-test (1) - Group A Eb = 300 Vdc; Rk/Ib = 17 mAdc; t = 500 hours - - - - - Life-test (1) end point: - Power oscillation (cw) 1236 - Po 25 - mW Life-test (2) - Group C; powe
11、r oscillation (pulsed) except prr = 2,000 10% t = 500 hours - - - - - Life-test (2) end point - Life-test (2) conditions - Po 300 - mW High-frequency vibration 1031 F = 50 Hz; 10G; Ebb = 300 V dc; Rp = 10,000 ohms; Ec/Ib = 10 mA dc Notes 4, 5 and 7 - Ep - 100 mV Secureness of base, cap, or insert 11
12、01 No voltages; torque to be applied between anode and pins without shock Notes 4 and 7 - - 20 - lb-in Torque-test end point - Total grid current 1266 Note 7 - Ic - -0.5 A dc Frequency draft - Notes 4, 6 and 7 - F - 2.0 MHz NOTES: 1. The following test methods shall not apply: MIL-STD-1311 Methods 1
13、006 and 1201. 2. The pulse shape shall be in accordance with method 1296. Minimum power output limit, based on a duty factor of 0.001, may be adjusted for the exact duty factor used. Coupling and tuning to be adjusted for maximum power output. The tube shall operate under the given conditions and mi
14、nimum output, or greater, for a minimum of 30 seconds without arcing or instability as evidenced by pronounced variations in the average anode current meter or the power output meter. If temporary arcing does occur during the 30-second period, the tube must subsequently operate for 60 seconds withou
15、t arcing. The test may be discontinued, at the end of the 30-second period, if the power output has not completely stabilized but is rising. If the power output is falling, the test is continued until a stable reading is obtained. For qualification approval, a stable reading shall be obtained. 3. Th
16、e starting voltage is measured by raising the pulsed anode voltage from zero and noting the voltage at which a readable indication is obtained on the power meter. The tube may not be oscillating during the full width of the modulation pulse during this test. 4. Test 10 tubes selected at random from
17、the first production lot of each calendar year, and approximately every 90 days of production during the year. If one tube fails to pass the specified end point, the failed test shall become a part of conformance inspection, part 2, on all lots in process. After three consecutive successful submissi
18、ons, the test shall revert to the 10-tube quarterly test. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/868F 45. Vibrate in direction perpendicular to plane of grid. 6. Frequency drift. (a) Set for conditions of power oscillation (cw). (b
19、) Reduce Ef to 6.0 volts and allow frequency to stabilize. Record frequency. (c) Raise Ef to 6.6 volts and allow frequency to stabilize. Record frequency. (d) Reduce Ef to 6.0 volts and allow frequency to stabilize. Record frequency. (e) Readings (b) and (d) shall not differ by more than 0.3 MHz. If
20、 a greater difference is found, repeat (a) through (c) inclusive. (f) Frequency drift is equal to the difference between the frequency recorded at (b) and (c), or (c) and (d), whichever is greater. (g) During the frequency drift test, there shall be no evidence of abrupt change in the power output m
21、eter. If such a change does occur, the oscillator shall be returned for a more stable operation. 7. This test shall be performed yearly. An accept on zero defect sampling plan shall be used with sample of three tubes with an acceptance number of zero. In the event of failure, the test will be made a
22、s a part of conformance inspection, part 2, acceptance level 6.5 (see 8/). The yearly sampling plan may be reinstated after three consecutive sampling have been accepted. 8. This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III. Provided by IHSNot for R
23、esaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/868F 5With top surface of washer (grid rf contact) in contact with surface of gage and with lower edge of washer (grid rf contact) in contact with surface of gage, external glass surface of tube shall not be in conta
24、ct with gage at any point. Equivalent gaging procedure any be used. GAGING PROCEDURE, GLASS SURFACE FIGURE 1. Outline drawing of electron tube type 2C40A. 123Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/868F 6Ltr Dimensions in inches wit
25、h metric equivalents (mm) in parentheses Notes Minimum Maximum Conformance inspection, part 2 A 2.562 (65.07) a B 1.973 (50.11) C 1.220 (30.99) 1.260 (32.00) D .850(21.59) .880(22.35) E .395(10.03) .455(11.56) a F .475(12.07) .505(12.83) G .360( 9.14) .390( 9.91) H .180( 4.57) .210( 5.33) a J .360(
26、9.14) .390( 9.91) a K .030( .76) .035( .89) a L .242( 6.15) .258( 6.55) M .248( 6.30) .252( 6.40) P .016( .41) .047( 1.19) a R .557(14.15) .567(14.40) S .808(20.52) .816(20.73) T 1.023 (25.98) 1.039 (26.39) U 1.216 (30.89) 1.236 (31.39) a V B6-108 Reference dimensions N 45 Notes: a. These dimensions
27、 shall be inspection on 10 tubes a month when in continuous production. Failure of one tube to meet tolerances for any dimensions shall cause that dimension to become for all lots in process, part of conformance inspection, part 2. b. External glass surface of tube shall conform to the detailed requ
28、irements of figure 1. Conformance inspection, part 2 shall apply. c. Cathode rf contact surface shall be free from welding flash material, Conformance inspection, part 2 shall apply. d. Limits of dimension U do not apply at points where skirt is crimped to base. e. Radius with limits as specified ma
29、y be used instead of chamfer. f. External metal surfaces, except base pins, shall be silver plated 30msi, minimum. Conformance inspection, part 2, shall apply. g. Eccentricity of contact surfaces shall be as follows. Conformance inspection, part 2, shall apply. Contact surface TIR maximum Reference
30、surface Grid .016 Anode cap Cathode, rf .016 Grid FIGURE 1. Outline drawing of electron tube type 2C40A. Continued. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/868F 7Referenced documents: In addition to MIL-PRF-1, this document referenc
31、es the following: MIL-STD-1311 DESC DWG 65025 DWG 102-JAN DWG 209-JAN Marginal notations are not used in the revision to identify changes with respect to the previous issue due to the extent of the changes. Custodians: Preparing activity: Army CR DLA- CC Navy EC Air Force 85 (Project 5960-2008-056)
32、DLA CC Review activities: Army AR Navy AS, CG, MC, OS Air Force 99 NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at http:/assist.daps.dla.mil/ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
