1、 MIL-PRF-1/1619D 30 September 2009 SUPERSEDING MIL-PRF-1/1619C 4 September 1998 PERFORMANCE SPECIFICATION SHEET ELECTRON TUBE, POWER TYPES 8161 AND 8251 This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring the electron tu
2、be described herein shall consist of this document and the latest issue of MIL-PRF-1. DESCRIPTION: Triodes, ceramic, metal. See figures 1 and 2. Mounting position: Vertical, base down or up. Weight: 8161: 6.25 pounds nominal. 8251: 7.5 pounds nominal. ABSOLUTE RATINGS: C telegraphy Type 8161: Parame
3、ter: Unit: F1 MHz Ef V ac Eb kV dc Ec kV dc Ib A dc Pg W Pp kW Pi kW Anode core and seal T C Cooling Maximum Minimum 110 - 7.9 7.1 4.0 - -1.0 - 2.0 - 150 - 4.0 - 7.2 - 250 - - - Test conditions: - 7.5 3.0 Adj. 0.83 - - - - 1/ ABSOLUTE RATINGS: C telegraphy Type 8251: Parameter: Unit: F1 MHz Ef V ac
4、Eb kV dc Ec kV dc Ib A dc Pg W Pp kW Pi kW Anode core and seal T C Cooling Maximum Minimum 30 - 7.9 7.1 4.0 - -1.0 - 2.0 - 150 - 4.0 - 7.2 - 250 - - - Test conditions: 2/ See footnotes at end of table I. _ GENERAL: Qualification - Required. AMSC N/A FSC 5960 INCH-POUND Provided by IHSNot for ResaleN
5、o reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1619D 2 TABLE I. Testing and inspection. Limits Inspection Method MIL-STD-1311Conditions SymbolMin Max UnitConformance inspection, part 1 Filament current 1301 If 49 54 A ac Peak emission 1231 eb = ec = 2,500 v is 35 - aEl
6、ectrode voltages (grid) 1261 Ec -67 -100 V dcTotal grid current 1266 5/ Ic - -50 A dc Primary grid emission 1266 Ef = 8.3 V ac;t = 15 sec; Ic = 0.9 A dc; anode grounded Isg - -250 A dc Conformance inspection, part 2 Amplification factor 1316A Mu 19 26 - Direct interelectrode capacitance 1331 CgpCin
7、Cout 16.8 29.2 0.60 23.2 40.2 1.20 pFpF pF Power oscillation 1236 Eb = 4,000 V dc;Ib = 1.8 A dc; F = 110 MHz; Rg = 2,150 ohms Po 4.2 - kWuseful Conformance inspection, part 3 Life-test Group C; power oscillation; t = 500 hours - - - - Life-test end points: Peak emission 1231 is 28 - a Primary grid e
8、mission 1266 Isg - -250 A dc Forced cooling 1143 Pp = 4.0 kW 3/ 6/ Tanode core T fil seal - 250 250 C C Pressure drop - Cooling 4/ 6/ Pressure - 1.4 In.H20 See footnotes on top of next page. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1
9、619D 3 TABLE I. Testing and inspection - Continued. 1/ In all electrical tests involving application of filament voltage, forced-air cooling is allowable as follows: base-to-anode airflow, 67 cfm maximum; anode-to-base airflow, 84 cfm maximum through the anode cooler, plus 3 cfm maximum directed int
10、o the filament stem structure. These figures apply for air at 40C maximum and at sea level. At higher air temperature or altitude, suitable correction of the airflow is allowable. Cooling air should be supplied before or simultaneously with application of electrode voltages (including the filament)
11、and may be removed simultaneously with them. 2/ The 8251 type may be made by attaching the base flying leads to an 8161 which has met all the requirements listed herein. After attachment of the flying leads and any other mechanical processing, including plating, the 8251 shall meet the requirements
12、of the holding period and the total grid current test. 3/ For the cooling test, the tube shall be mounted in an infinite baffle system, or equivalent, so that all air passing in a base-to-anode direction shall pass through the anode cooler of the tube. With cooling air of not less than 20C nor more
13、than 40C, both base and anode shall be cooled by applying an airflow of 67 cfm maximum at sea level. At altitudes above sea level, the equivalent mass flow may be used. An appropriate value of anode voltage and current shall be used to produce the specified anode dissipation. Temperatures shall be m
14、easured by means of thermocouples, located as follows: Anode core: The thermocouple shall be embedded in the base of the anode core, at the base of the cooling fins, by means of drilling a small hole shallow enough so that the tube vacuum shall not be lost, placing the welded thermocouple junction t
15、herein, and then peening the edges of the hole to hold the thermocouple firmly in place. Filament seal: The thermocouple shall be attached using a suitable cement to either the inner or the outer filament conductor and as close as possible to where the two conductors join the stem dielectric materia
16、l. Good electrical continuity between the thermocouple and the metal surface to which it is attached shall be demonstrated before the cooling test is performed. The size and material of the thermocouples, their installation, and the measuring instrument used to determine temperature shall be in acco
17、rdance with good engineering practice. 4/ The pressure drop across the anode cooler shall be measured while the tube is operating as specified during the cooling test. If test is performed at altitudes significantly above sea level and the airflow is adjusted for an equivalent mass-flow rate, the al
18、lowable pressure drop may also be recomputed on the same basis. 5/ This test to be performed first at the conclusion of the holding period. 6/ This specification sheet uses accept on zero defect sampling plan in accordance with MIL-PRF-1, table III. 7/ Reclaimed materials shall be utilized to the ma
19、ximum extent possible. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1619D 4 FIGURE 1. Outline drawing of electron tube type 8161 Dimensions (see note 1) Ltr Inches Millimeters Min Max Min Max Conformance inspection, part 2 A 4.094 4.156
20、103.99 105.56 C - 3.625 - 92.08 D .615 .635 15.62 16.13 E 1.490 1.510 37.85 38.35 F 2.990 3.010 75.95 76.45 G .812 .938 20.62 23.83 H 1.375 1.625 34.93 41.28 P 8.000 9.000 203.20 228.60 R - .040 - 1.02 S - .025 - 0.64 Conformance inspection, part 3 (see note 2) B .781 .844 19.84 21.44 J .375 .438 9.
21、53 11.13 K 3.875 4.250 98.43 107.95 L 2.937 3.063 74.60 77.80 M .688 .812 17.48 20.62 N 1.188 1.688 30.18 42.88 Q 1.000 1.125 25.40 28.58 NOTES: 1. Metric equivalents (to the nearest 0.01 mm) are given for general information only and are based upon 1 inch = 25.4 mm. 2. See 6/ Provided by IHSNot for
22、 ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1619D 5 NOTES: 1. Metric equivalents (to the nearest 0.01 mm) are given for general information only and are based upon 1 inch = 25.4 mm. 2. See 6/. FIGURE 2. Outline drawing of electron tube type 8251. Dimensions
23、(see note 1) Ltr Inches Millimeters Min Max Min Max Conformance inspection, part 2 A 4.094 4.156 103.99 105.56 C - 3.625 - 92.08 D 6.375 6.625 161.93 168.28 G .812 .937 20.62 23.82 H 1.375 1.625 34.93 41.28 P 8.000 9.000 203.20 228.60 S 7.937 8.437 201.60 214.30 T 8.937 9.437 237.00 239.70 U .194 .2
24、00 4.93 5.08 V .385 .395 9.78 10.03 Conformance inspection, part 3 (see note 2) B .781 .844 19.84 21.44 E .859 .890 21.82 22.61 F 7.000 7.500 177.80 190.50 J .375 .438 9.53 11.13 K 3.875 4.250 98.43 107.95 L 2.937 3.063 74.60 77.80 M .688 .812 17.48 20.62 N 1.188 1.688 30.18 42.88 Q 1.000 1.125 25.4
25、0 28.58 R 7.000 7.500 177.80 190.50 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1619D 6 Referenced documents. In addition to MIL-PRF-1, this document references the following: MIL-STD-1311 The margins of this specification are marked wi
26、th 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 cautioned to evaluate the requirements of this document based on
27、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 5960-2009-034) DLA - CC Review activities: Army - AR Navy - AS, CG, MC, SH Air Force - 11, 19, 99 NOTE: The acti
28、vities 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-,-,-
