1、INCH POUND MIL-PRF-1/302P 27 February 2004 SUPERSEDING MIL-PRF-1/302N 10 July 1998 PERFORMANCE SPECIFICATION SHEET ELECTRON TUBE, POWER TYPE 8172 This specification is approved for use by all Depart- ments 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: Tetrode, metal-glass and ceramic Outline drawing: See figure I Mounting position: Any Weight: 6 ounces nominal ABSOLUTE RATINGS: F1 (CW) = 500 MHz, F1 (pulsed) = 1,500 MHz Parameter: Ef eb Eb ec1 Ec1 ec2 Ec
3、2 Ib ik cooling Unit: Vac kv V dc v V dc kv V dc mA dc a note 1 Maximum: (notes 1 and 2) Class C Telep: 2.5 5% - - - 1,000 - - - -250 - - - 300 200 - - - - - - Class C Teleg: 2.5 5% - - - 1,250 - - - -250 - - - 300 250 - - - - - - Class C Pulsed: 2.5 5% 7.0 - - - -500 - - - 1.5 - - - - - - 7 - - - T
4、est conditions: 2.5 - - - 1,000 - - - Adj - - - 300 150 - - - note 3 ABSOLUTE RATINGS: F1 (CW) = 500 MHz, F1 (pulsed) = 1,500 MHz Parameter: tp Pg1 Pg2 Pp Pi tk T (ceramic seals and anode core) T (glass seal) Unit: s note 4 W W W W sec (min) C C Maximum: (notes 1 and 2) Class C Telep: - - - 2 12 165
5、 200 30 250 150 Class C Teleg: - - - 2 12 250 312 30 250 150 Class C Pulsed: 5 2 12 250 312 30 250 150 Test conditions: - - - - - - - - - - - - - - - 120 - - - - - - Qualification - Required. AMSC N/A FSC 5960 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
6、IHS-,-,-MIL-PRF-1/302P 2 TABLE I. Testing and Inspection. *Inspection MIL-STD-1311 method Conditions Acceptancelevel (see note 10) Symbol Limits Min Limits Max Units Conformance inspection, part 1 Pulse emission (1) Current division (long pulse, Method A) Electrode current (screen) Electrode voltage
7、 (grid) Total grid current Primary grid emission (control) Primary grid emission (screen) Heater current 2212 1372 1256 1261 1266 1266 1266 1301 Eb = Ec2 = 250 V dc; Ec1 = -100 V dc; egk/ik = 1.5 a; prr = 11.0 1.0; tp = 4,500 s (min); Ef = 2.25 V ac Eb = Ec2 = 250 V dc; Ec1 = -100 V dc; egk/ib = 1.0
8、 a; prr = 11.0 1.0; tp = 4,500 s (min) Eb = 2,000 V dc; Ib = 125 mA dc Ic1 = 70 mA dc; t = 15; anode and screen grid floating Ec1 = 0; Ic2 = 100 mA dc; t = 15; anode floating 0.65 0.65 0.65 0.65 0.65 0.65 0.65 0.65 ik egk ic1 ic2 Ic2 Ec1 Ic1 Isg1 Isg2 If - - - 8 - - - - - - -5.0 -32 - - - - - - - -
9、- 6.20 200 18 200 260 +3.0 -45 -15 -25 -250 7.30 ma v ma ma mA dc V dc A dc A dc A dc Aac Conformance inspection, part 2 Low-frequency vibration Bump RF useful output power Direct-interelectrode capacitance 1031 1036 2214 1331 No voltages applied Angle = 20 Class C amplifier; F = 460 to 490 MHz; Eb
10、= 1,250 V dc; Ec1 = -90 V dc; Ec2 = 250 to 300 V dc; Ic1 = 20 mA dc (max); Eg1/1b = 250 mA dc; Ef = 2.30 V ac (see note 5) Grounded grid - - - - - - - - - - - - - - - - - - Po Cpk Cin Cout - - - - - - 145 - - - 14.5 4.0 - - - - - - - - - 0.010 19.00 4.90 - - - - - - W useful pF pF pF See notes at en
11、d of table I. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/302P 3 TABLE I. Testing and Inspection - Continued. * Inspection MIL-STD-1311 method Conditions Symbol Limits Min Limits Max Units Conformance inspection, part 2 Continued. Direc
12、t-interelectrode capacitance Pulse emission (2) 1331 2212 Grounded cathode Eb = Ec2 = 250 V dc; Ec1 = -100 V dc; egk/ik = 1.5 a; prr = 11.0 1.0; tp = 4,500 s (min); Ef = 2.50 V ac Cgp Cin Cout ik - - - 25.0 4.00 - - - 0.050 29.0 4.90 100 pF pF pF ma Conformance inspection, part 3 Pulse emission (2)
13、Primary grid emission (control) Primary grid emission (screen) Life-test (2) provisions Life-test (2) end points: Interelement leakage resistance Humidity Post-humidity end point: Total grid current Pulse-power output 2212 1266 1266 - - - - - - 1366 1011 - - - 1266 - - - Group C; Ec1 = Ec2 = Eb = 0;
14、 Ef = 2.75 V ac; t = 500 hours supply voltage = 500 V dc; Rs = 2.5 Meg; anode positive (see note 6) (see note 7) Eb = 7 kv; ib = 6a; ec2 = 1.2 kv; tp = 5 s; prr = 1,000; F = 1,200 50 MHz (see note 7) ik Isg1 Isg2 - - - Rg1g2 Rg2k Rg1k - - - Ic1 po - - - - - - - - - - - - 10 10 10 - - - - - - 17 100
15、-100 -250 - - - - - - - - - - - - - - - -20 - - - ma A dc A dc - - - Meg Meg Meg - - - A dc kw See notes at end of table I. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/302P 4 NOTES: 1. Forced-air cooling shall be provided for the base a
16、nd anode. The maximum seal and anode core temperature ratings shall not be exceeded. At an anode dissipation of 250 watts and an incoming air temperature of 25C maximum, a minimum airflow of 5.6 cfm at sea level shall pass through the anode cooler. With no voltages applied to the tube, the static pr
17、essure drop across the anode cooler with airflow of 5.6 cfm, at 25C sea level, is 0.32 inch of water maximum. The pressure drop varies with the amount of escaping air and with the shape and construction of air director. This airflow requirement applies at bias voltages less than 100 volts and at fre
18、quencies less than 500 MHz (CW) and 1,500 MHz (pulsed). Air cooling on the tube shall be increased with increased negative grid bias, increased incoming air temperature, or increased frequency of operation. The stem shall be cooled either by a portion of the anode air or by a separate air supply. Th
19、e airflow shall be applied before or simultaneously with them. 2. The transit-time heating effect of the cathode shall be compensated by a reduction in heater voltage after dynamic operation of the tube has started. The back heating is a function of frequency, grid current, grid bias, and duty cycle
20、. For satisfactory life the heater voltage shall be adjusted to the value indicated below. The rated variation of 5 percent Ef shall apply to the value selected from this table. Conditions of operation are limited to those which indicate a heater voltage of 2.3 volts or more. FREQUENCY (MHz) Ef (V a
21、c) Up to 400 2.5 401 to 1,000 2.2 1,000 to 1,500 2.0 3. In all electrical tests involving application of heater voltage, forced-air cooling of the tube shall be allowable at the rate of 6.0 cfm, maximum for the base and anode. A separate source shall be used for the base and anode but neither shall
22、exceed 6.0 cfm. The cooling air shall not have a temperature less than 20C, nor an absolute pressure greater than 32 in. Hg. 4. With a prr of 1,000 or less and a tp of 5 s or less, ib shall be limited to 6.0 amperes. For pulses of longer duration or higher repetition rates, ib shall be reduced in ac
23、cordance with the data contained on figure 2. 5. Use cavity and circuit as shown on Drawing 224-JAN. 6. This test shall be made 30 minutes after Ef is turned off. Rated airflow shall be maintained during the 30-minute interval. Measurement to be made with General Radio Megometer No. 1862C, or equiva
24、lent. Unused elements are to be left floating. 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 defects. In the event of failure, the test will be made as a part of conformance inspection, part
25、2 with acceptance level 6.5 (see note 10). The regular yearly sampling plan may be reinstated after three consecutive samples have been accepted. 8. Reclaimed materials shall be utilized to the maximum extent possible. 9. The tube manufacturer warrants the tube for one year from the date of shipment
26、, or 750 hours of heater on time, whichever first elapses. This warranty applies only when the tube is operated within the maximum ratings (see “Absolute Ratings” of MIL-PRF-1). A defective tube shall either be replaced, or at the option of the manufacturer, a credit shall be made in the amount of t
27、he original purchase price pro-rated on the basis of 750 hours of heater on-time. 10. This specification sheet uses accept on zero defect sampling plan, in accordance with MIL-PRF-1, table III. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-
28、1/302P 5 NOTES: 1. Reference dimensions are for information only and are not required for inspection purposes. 2. Available contact length. 3. Dome contour shall be such that it will be contained within crosshatch area of template shown on figure 3. Optical comparator techniques are normally used fo
29、r this purpose. 4. See note 7 of table I. FIGURE I. Outline drawing of electron tube type 8172. Dimensions in inches with metric equivalents (mm) in parentheses Ltr Minimum Maximum Notes Conformance inspection, part 2 A 2.750 (69.85) B 1.615 (41.02) 1.635 (41.53) D 1.417 (35.99) 1.433 (36.40) E 0.58
30、7 (14.91) 0.597 (15.16) F 0.317 (8.05) 0.327 (8.31) G 0.088 (2.24) 0.098 (2.49) Conformance inspection, part 3 (See note 4) C 1.406 (35.71) H 0.313 (7.95) J 0.719 (18.26) 0.781 (19.84) 2 K 0.750 (19.05) 0.813 (20.65) L 0.188 (4.78) 2 M 0.500 (12.70) 0.578 (14.68) N 0.234 (5.94) 0.266 (6.76) P 0.031
31、(0.79) 0.063 (1.60) T 0.344 (8.74) 2 U 0.406 (10.31) 2 V 0.469 (11.91) 2 Reference dimensions 1 R 0.094 (2.39) S 0.125 (3.18) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/302P 6 Pulse anode current (ib) capability is dependent on pulse l
32、ength (tp) and duty factor (Du). Maximum ib for a given tp is shown; maximum Du may then be derived from the relationship: 0.25 = ib Du PULSE DERATING CHART FIGURE 2. Pulse anode current versus pulse length. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IH
33、S-,-,-MIL-PRF-1/302P 7 FIGURE 3. Contour template of dome shape. Referenced documents. In addition to MIL-PRF-1, this specification sheet references MIL-STD-1311. Changes from the previous issue. The margins of this specification are marked with vertical lines to indicate where changes from the prev
34、ious 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 upon the entire content irrespective of the marginal notatio
35、ns and relationship to the last previous issue. Custodians: Preparing activity: Army - CR DLA - CC Navy - EC Air Force - 11 (Project No. 5960-3702) DLA - CC Review activities: Army - AR, CR4 Navy - AS, CG, MC, 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 www.dodssp.daps.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
