1、 MIL-PRF-1/1580E 29 August 2011 _ SUPERSEDING MIL-PRF-1/1580D 17 August 2004 PERFORMANCE SPECIFICATION SHEET ELECTRON TUBE, POWER TYPE 8621 This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring the electron tube described
2、herein shall consist of this document and the latest issue of MIL-PRF-1. DESCRIPTION: Tetrode, ceramic-metal. Outline: See figure 1. Mounting position: Any. Weight: 4 ounces (113.4 grams) nominal. ABSOLUTE RATINGS: Class AB1 Parameter: F Ef Eb Ec1 Ec2 Ehk Ib Unit: MHz V ac V dc V dc V dc V dc mA dc
3、Maximum: 500 26.5 5% 2,000 -150 400 150 250 Test conditions: - 26.5 1,000 Adj 300 0 150 ABSOLUTE RATINGS: Class AB1 Parameter: Pg1 Pg2 Pp T(seals and anode core tk Cooling Unit: W W W C sec (min) 1/ Maximum: 2 12 250 250 30 - Test conditions: - - - - 120 2/ See footnotes at end of table I. _ GENERAL
4、: Qualification: Required. AMSC N/A FSC 5960 INCH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1580E 2 TABLE I. Testing and inspection. Inspection Method Notes Conditions Acceptance Symbol Limits Unit MIL-STD-1311 Level 11/ Min Max
5、 Conformance inspection, part 1 Pulse emission 2212 3/ Eb = Ec2 = 250 V dc; Ec1 = -100 V dc; egk/ik = 1.5 a; prr = 11 1; tp = 4,500 s (min); Ef = 23.8 V ac 0.65 ik - 200 ma Heater current 1301 - 0.65 If 0.45 0.62 A ac Electrode voltage (grid) 1261 - Eb = 1,600 V dc; Ec2 = 400 V dc; Ec1/Ib = 100 mA d
6、c 0.65 Ec1 -62.0 -76.0 V dc Electrode current (screen) 1256 - 0.65 Ic2 -7.0 +3.0 mA dc Total grid current 1266 4/ Eb = 2,000 V dc; Ec1/Ib = 125 mA dc 0.65 Ic1 - -15 A dc Primary grid emission (control) 1266 - Ic1 = 70 mA dc; t = 120; anode and screen grid floating 0.65 Isg1 - -250 A dc Primary grid
7、emission (screen) 1266 - Ec1 = 0; t = 120; Ic2 = 100 mA dc; anode floating 0.65 Isg2 - -250 A dc Current division (long pulse, method A) 1372 - Eb = Ec2 = 250 V dc; Ec1 = -100 V dc; egk/ib = 1.0 a; prr = 11 1; tp = 4,500 s (min) 0.65 egk ic1 ic2 6.0 - - 18.0 200 260 v ma ma Interelement leakage resi
8、stance (cold) 1366 - Supply voltage = 500 V dc; Rs = 2.5 Meg; anode positive 0.65 Rg2p 200 - Meg Conformance inspection, part 2 Low-frequency vibration 1031 - - No voltages applied - - - - - Direct-interelectrode capacitance 1331 - EIA standard shields No. 320 and 321, or equal - Cgp Cin Cout - 14.2
9、 4.0 0.06 17.2 5.3 pF pF pF See footnotes at end of table. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1580E 3 TABLE I. Testing and inspection - Continued. Inspection Method Notes Conditions Acceptance Symbol Limits Unit MIL-STD-1311 Le
10、vel 11/ Min Max Conformance inspection, part 2 - Continued Heater-cathode leakage 1336 - Ehk = +150 V dc Ehk = -150 V dc - Ihk Ihk - - 150 150 A dc A dc Power output - 5/ Class AB1 amplifier; F = 1 MHz (min), 30 MHz (max); Eb = 1,600 V dc; Ec2 = 400 V dc; Ec1/Ibo = 100 mA dc; R = 2,000 ohms; t = 300
11、 (max); Pd = zero level as indicated by Ic1 = 10 A dc (max) - Po 250 - W (useful) Conformance inspection, part 3 Shock 1042 - Angle = 20 Test condition B - - - - - Life test - 6/ Stability; Group C; Ef = 27.8 V ac; Ec2 = 400 V dc at t = 0 hours, Ec1/Ib = 100 mA dc; t = 500 hours - - - - - Life-test
12、end points: Stability Interelement leakage resistance (cold) Power output - - 1366 - 7/ - - - - - Ib Rg1g2 Rg1k Rg2k Rg2p Po - 50 50 50 50 235 20 - - - - - mA dc Meg Meg Meg Meg W (useful) Forced cooling 1143 8/ 9/ Ec1/Ib = 250 mA dc - T(anode core) - 225 C Coolant-pressure drop versus coolant flow
13、(forced air) 1155 8/ 10/ No voltages applied - - - 0.35 inch H2O Humidity 1011 8/ - - - - - Humidity-test end point: Total grid current - 1266 - - Ic1 - -15 A dc See footnotes at top of next page. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P
14、RF-1/1580E 4 TABLE I. Testing and inspection - Continued. 1/ At an anode dissipation of 250 watts and an incoming air temperature of 25C maximum, a minimum airflow of 3.8 cubic feet per minute (cfm) at sea level shall pass through the anode cooler. At this flow of 3.8 cfm, the static pressure drop a
15、cross tube and socket shown on Drawing 246-JAN shall be approximately 0.30 inch of water. The pressure drop varies with the amount of escaping air and with the shape and construction of the air director. This rating applies at bias voltages less than 100 volts and frequencies less than 500 MHz. Air
16、cooling on the tube base shall be increased with increasing negative grid bias or with increasing frequency, or a combination of both. In all cases of operation, a socket which provides forced-air cooling of the base shall be used and maximum seal temperature ratings shall not be exceeded. The airfl
17、ow shall be applied before or simultaneously with electrode voltages, and may be removed simultaneously with them. 2/ In all electrical tests involving heater voltage, the socket shown on Drawing 246-JAN, shall be used. Unless otherwise specified in the specific test conditions, forced-air cooling i
18、s permitted at the rate of 4.0 cfm maximum for the base and anode. A separate source may be used for the base anode, but neither shall exceed 4.0 cfm. 3/ The input wave shape shall have a tr and a tf of 25 s maximum each, and the slope of the top of the pulse shall be not greater than 0.5 percent wi
19、th a ripple not to exceed 0.1 percent. 4/ This test is to be the first test performed at the conclusion of the holding period. 5/ Alternately the power output test may be performed as follows: - Power output Class AB1 amplifier; F = 1 MHz (min), 30 MHz (max); Eb = 1,600 V dc; Ec2 = 400 V dc; Ec1/Ibo
20、 = 100 mA dc; R = 2,000 ohms; t = 300 (max); Pd/Po = 250 W (useful) Ic1 - 10 A dc Drive power (Pd) may not be increased beyond the level which produces a grid current (Ic1) of 10 A dc. For life-test end-point check of power output, Pd/Po = 235 W (useful). 6/ Under the voltage conditions specified, t
21、he bias voltage shall be adjusted to produce the specified value of anode current during an initial adjustment period not to exceed 2 hours. 7/ With the voltage conditions as specified for life test, stability, including the original value of Ec1 which was used to set Ib = 100 mA dc, the value of Ib
22、 shall be measured and it shall not have changed by more than 20 mA dc from the original value of 100 mA dc. 8/ 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 w
23、ill be made as a part of conformance inspection, part 2, acceptance level 6.5 (see 11/). The yearly sampling plan may be reinstated after three consecutive samples have been accepted. 9/ The forced-cooling test shall be made as follows: At an ambient temperature of 25C, both base and anode shall be
24、cooled by applying an airflow of 3.8 cfm maximum at sea level from a single source using the infinite baffle system as shown on figure 2, or equal. At the test conditions specified herein, the anode core temperature shall not exceed the limits specified herein. Temperature shall be measured by means
25、 of a thermocouple located as follows: The thermocouple shall be embedded in the top of the core, adjacent to the cooler, by means of drilling a small hole, shallow enough so that the tube vacuum shall not be lost, placing the welded thermocouple junction therein, and then peening the edges of the h
26、ole to hold the thermocouple firmly in place. In all cases, good electrical continuity between the thermocouple and the metal area in close proximity shall be demonstrated before the cooling test can be performed. 10/ An infinite baffle system, as shown on figure 2, or equal, with an airflow of 3.8
27、cfm at sea level shall be used. The static pressure drop shall be measured across the tube and socket. 11/ This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from I
28、HS-,-,-MIL-PRF-1/1580E 5 NOTES: 1. Pin alignment shall be checked by means of gauge GB8-3. Dimensions of control-grid contact shall be inspected by means of gauges specified on Drawing 246-JAN and shall be conformance inspection, part 2. 2. Alignment of anode, screen-grid, and control-grid contact s
29、urfaces shall be determined by means of gauge specified on Drawing 168-JAN. Conformance inspection, part 2, shall apply. 3. Air-system socket shall be as specified on Drawing 246-JAN, EIMAC SK-600, or equal. 4. Location of guide lug of control-grid contact shall be referenced by a notch or arrow on
30、the anode radiator in position shown. 5. Anode clamping shall be confined to anode radiator. 6. Top cap outline optional provided it meets requirements of dimensions J and K. 7. Dimensions shall be checked yearly. An accept on zero defect sampling plan shall be used, with sample of three tubes with
31、an acceptance number of zero. In the event of failure, the test will be made as a part of conformance inspection, part 2, acceptance level 6.5 (see 11/). The yearly sampling plan shall be reinstated after three consecutive samples have been accepted. FIGURE 1. Outline drawing of electron tube type 8
32、621. Dimensions Ltr Inches Millimeters Min Max Min Max Conformance inspection, part 2 A 2.324 2.464 59.03 62.59 C 1.810 1.910 45.97 48.51 Conformance inspection, part 3 (see note 7) B 1.610 1.640 40.89 41.66 D .750 .810 19.05 20.57 E .710 .790 18.03 20.07 F - 1.406 - 35.71 G .187 - 4.75 - H Base: B8
33、-236 (see note 1) J .559 .573 14.20 14.55 K .240 - 6.10 - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1580E 6 Dimensions Ltr Inches Millimeters Min Max Min Max A 5.995 6.005 152.27 152.53 B 5.995 6.005 152.27 152.53 C 11.995 12.005 304.
34、67 304.93 D 1.995 2.005 50.67 50.93 NOTES: 1. Dimension are in inches. 2. Metric equivalents are given for general information only and are based upon 1.00 inch = 25.4 mm. 3. Fisher Porter flowrator model B4-27-10/77, or equal. 4. 12 inch (304.80 mm) cube inside dimensions, compound sealed. 5. F. W.
35、 Dwyer manometer, 0 to 1 inch (25.40 mm) of water (Fisher Scientific Company 11-295-5 draft gauge), or equal. 6. Socket specified on Drawing 246-JAN. FIGURE 2. Baffle system. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1580E 7 Reference
36、d documents. In addition to MIL-PRF-1, this specification sheet references MIL-STD-1311, Drawing 246-JAN and Drawing 168-JAN. 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 Gove
37、rnment assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous issue. Custodian: Preparing act
38、ivity: Army - CR DLA - CC Navy - EC Air Force - 85 (Project 5960-2010-026) DLA - CC Review activities: Navy - AS, CG, MC, OS, SH Air Force - 19, 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.daps.dla.mil/. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
