1、 MIL-PRF-1/1485H 11 June 2013 SUPERSEDING MIL-PRF-1/1485G 12 June 2012 PERFORMANCE SPECIFICATION SHEET ELECTRON TUBE, THYRATRON TYPE 7665 AND 7665A This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring the electron tube de
2、scribed herein shall consist of this document and the latest issue of MIL-PRF-1. DESCRIPTION: Hydrogen, ceramic-metal. See figures 1 and 1A. Mounting position: Any. Weight: 10 ounces nominal. ABSOLUTE RATINGS: Parameter: Ef epy epx Ebb egy egx ib Ecc Ip Ib Unit: V ac kv kv V dc v v a V dc A ac A dc
3、Maximum: Minimum: 6.8 5.8 16.0 1/ 2.0 16.0 2/ 5% epy - 1,000 600 3/ 200 200 - 350 - 150 - 6.5 - 0.50 - Test conditions: 6.3 16.0 - - 150 - - 0 - - ABSOLUTE RATINGS: Parameter: prr Eres Pb tk dik/dt TA tj Cooling Unit: pps V ac - sec a/s C s 7/ 5/ Maximum: Minimum: 4/ - 6.8 5.8 5.0 x 1094/ - - 180 2,
4、000 - +150 -55 0.005 - - - Test conditions: 1,000 6.3 6/ - 180 - - - - See footnotes at end of table I. _ GENERAL: Qualification - Required. This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III. Service-life guarantee 500 hours minimum tube operating t
5、ime. Marking Tubes sold under service-life guarantee shall be marked with the contract number and with the number of tube operating hours guaranteed. AMSC N/A FSC 5960 INCH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1485H 2 TABLE
6、 I. Testing and inspection. Inspection Method Condition Symbol Limits Unit MIL-STD-1311 Min Max Conformance inspection, part 1 Instantaneous starting 3267 epy = 16 kv (min); 10/ Ef = Eres = 6.8 V - - - - Operation (1) 3246 epy = 18 kv; 9/ Ef = Eres = 5.8 V; t = 10 minutes egy - 150 v DC anode voltag
7、e for conduction 3247 Ef = Eres = 5.8 V Ebb - 1,000 V dc Heater current (cathode) 3241 If 3.5 8.0 A ac Heater current (reservoir) Pulse emission (method A) 3241 3251 ik = 350 a; tp = 5.0 s 10 percent; prr = 60 10 percent; tr = 0.5 s (max); starting time of pulse = 2.5 s; specified time interval = 4.
8、0 s Ires egk 1.0 - 4.0 200 A ac v Conformance inspection, part 2 Operation (1A) Anode delay time 3246 3256 Operation (1); t = 10 minutes tk = 5 minutes Ef = Eres = 6.8 V Operation (1); t = 120 seconds egy tad - - 150 0.4 V s Anode delay time drift 3256 Anode delay time 11/ tad - 0.10 s Time jitter 3
9、261 Operation (1), 9/ 12/ except epy = 8 kv tj - 0.005 s Conformance inspection, part 3 Life test (1) - Group C; t = 96 hours “on” and 1 hour “off” (tube mounted horizontally); t = 500 hours 9/, 14/ - - - - See footnotes at end of table. Provided by IHSNot for ResaleNo reproduction or networking per
10、mitted without license from IHS-,-,-MIL-PRF-1/1485H 3 TABLE I. Testing and inspection - Continued. Inspection Method Condition Symbol Limits Unit MIL-STD-1311 Min Max Conformance inspection, part 3 - Continued Life-test (1) end points: 14/ Operation (1) and (1A) 3246 egy - 150 v DC anode voltage for
11、 conduction 3247 egy = 150 v Ebb - 1,000 V dc Time jitter 3261 egy = 150 v tj - 0.005 s Shock 1041 100 G at 11 ms; no voltage applied - - - - Variable-frequency vibration 1031 No voltage applied 8/ - - - - Shock and variable- frequency vibration end points: Operation (1) 3246 egy - 160 v Time jitter
12、 3261 tj - 0.005 s Operation at elevated ambient temperature 3246 TA = 150C; 9/ 13/ t = 5 hours egy - 150 v 1/ Instantaneous starting is permissible. The maximum permissible epy is 16 kv and shall not be attained in less than 0.04 second. 2/ In pulsed operation, the peak inverse voltage, exclusive o
13、f a spike of 0.05 s (maximum) duration, shall not exceed 5.0 kv during the first 25 s following the pulse. 3/ The driver pulse, measured at the tube socket with the thyratron grid disconnected: 200 volts minimum, 600 volts maximum; tr = 0.35 maximum; grid pulse duration 2.0 s minimum. Impedance of d
14、rive circuit: 50 to 500 ohms. At -55C, a minimum of 250 volts is required. 4/ The tube is capable of operation at more than 50,000 pps within the limitations of the Pb factor and the Ib current ratings. With a saturable reactor, Pb equal to 7 x 109is permissible for certain applications. 5/ It may b
15、e desirable to employ forced-air cooling under conditions of high Pb number operations. A cooling air-blast of 5 cfm may be directed into the anode cup. 6/ The optimum reservoir voltage for operation in accordance with operation (1) conditions is 6.3 V ac and shall be held within 7.5 percent. Applic
16、ations involving other operating conditions may necessitate the re-determination of the optimum reservoir voltage. 7/ Appreciably less jitter than 0.005 s can be realized using an anode voltage of 8 kv or more, a grid drive amplitude near the maximum and a grid drive impedance near the minimum value
17、s. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1485H 4 TABLE I. Testing and inspection - Continued. 8/ There shall be no pronounced resonance in the range from 0 to 2,000 pps. 9/ The circuit constants shall be so chosen, that at epy = 1
18、6 kv under resonant charging conditions; dik/dt = 1,500 a/s (min); ib = 175 a (min); tp = 1.0 10 percent s; prr = 1,000 (min). The grid pulse characteristics shall be: tp = 2.0 s (max); tr = 0.35 s (min); and Zs = 500 ohms (min). 10/ The tube shall operate satisfactorily on push-button starting with
19、in three attempts when the anode voltage (epy) is applied to the tube under test (TUT) in such a manner as to rise from 0 kv to 16 kv minimum within .03 second. (The filter in the rectifier shall be so designed that the epy reaches at least 7 kv within .015 second.) Any tube failing to start within
20、three attempts will be considered a failure. 11/ This test shall be performed simultaneously with the operation (1) test. An anode delay time measurement shall be made at the end of 2 minutes and at the end of 10 minutes of that test. The change in anode delay time (with respect to the 2 minute read
21、ing) shall not exceed the specified value. 12/ The tube shall be tested by applying a peak forward anode voltage not to exceed the value specified in the test conditions for the time jitter test immediately after the cathode warm-up period (tk). After 60 seconds of operation, the variation in firing
22、 time (tj), measured at 50 percent of the cathode current pulse, shall be not greater than the amount specified. 13/ This test shall be conducted for a total of 5 hours with no more than three kick outs. The tube shall be started with 107.5 percent Eres and operate at this value for 4 hours. At the
23、start of the fifth hour, and while the tube is still operating, the voltage shall be lowered to Eres = 92.5 percent and remain there for the final one hour of operation. 14/ With qualifying activity approval the manufacturer may provide, in accordance with MIL-PRF-1, service-life guarantee, in lieu
24、of performing life testing. Life test endpoints specified shall apply to service-life guarantee conformance as well as life test conformance. The number of hours of system-deployed, accumulated tube- operating time shall be approved by the qualifying activity and shall be a minimum of 500 hours. Ser
25、vice-life guarantee shall define tube operating time and not time from purchase or delivery. Tubes sold under service-life guarantee shall be marked with contract number and with the number of tube operating hours guaranteed. The qualifying activity may restore life testing requirements when service
26、 performance or tube reliability indicate it is justified. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1485H 5 FIGURE 1. Outline drawing of electron tube type 7665. Dimensions Ltr Inches mm Min Max Min Max Conformance inspection, part 2
27、 A 2.43 2.47 61.72 62.74 B 1.740 1.760 44.20 44.70 C - .28 - 7.11 E 1.25 - 31.75 - F 2.245 2.255 57.02 57.28 G - 1.50 - 38.10 Reference dimensions D .030 0.76 H 2.031 51.59 J 6.00 152.40 K .203 5.16 M .147 3.73 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
28、 IHS-,-,-MIL-PRF-1/1485H 6 FIGURE 1A. Outline drawing of tube type 7665A. Dimensions Ltr Inches mm Min Max Min Max Conformance inspection, part 2 A 2.377 2.497 60.38 63.42 B 1.365 1.385 34.67 35.18 C 1.877 1.997 47.68 50.72 E - .279 - 7.09 F - 1.00 - 25.40 H - 2.250 - 57.15 J - 1.50 - 38.10 Referenc
29、e dimensions D .030 0.76 G 2.031 51.59 K 6.00 152.40 M .203 5.16 N .147 3.73 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1485H 7 Referenced documents. In addition to MIL-PRF-1, this specification sheet references the following documents
30、: MIL-STD-1311. The margins of this specification are marked with vertical lines to indicate where changes from the previous issue were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are ca
31、utioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous issue. Custodians: Preparing activity: Army - CR DLA - CC Navy - EC Air Force - 85 (Project 5960-2013-037) DLA - CC Review activities: Army -
32、 AR, MI Navy - AS, CG, OS, SH 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 https:/assist.dla.mil/. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
