1、 MIL-PRF-1/1385K 7 June 2012 SUPERSEDING MIL-PRF-1/1385J 16 July 2004 PERFORMANCE SPECIFICATION SHEET ELECTRON TUBE, POWER TYPES 7580W AND 8930 * This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring the electron tube desc
2、ribed herein shall consist of this document and the latest issue of MIL-PRF-1. DESCRIPTION: Tetrode, ceramic-metal. 9/ See figure 1. Mounting position: Any. Weight: 4 ounces (113.4 grams) nominal (7580W). 6 ounces (170.1 grams) nominal (8930). ABSOLUTE RATINGS: Parameter: F1 Ef Eb Ec1 Ec2 Ehk Ib Pg1
3、 Pg2 Unit: MHz V ac 1/ V dc V dc V dc V dc mA dc W W Maximum: Class C Telep: 500 6.0 10% 1,500 -250 300 150 200 2 12 Class C Teleg: 500 6.0 10% 2,000 -250 300 150 250 2 12 Class AB1: 500 6.0 10% 2,000 -250 500 150 250 2 12 Class AB1 (8930): 500 6.0 10% 2,400 -250 500 150 250 2 12 Test conditions: -
4、6.0 1,000 Adj 300 0 150 - - ABSOLUTE RATINGS: Parameter: Pp Pi T(seal) T(anode core) tk Cooling Barometric pressure, reduced Unit: W W C C sec (min) 2/ mmHg Maximum: Class C Telep: 165 300 250 250 30 - 349 Class C Teleg: 250 500 250 250 30 - 349 Class AB1: 250 500 250 250 30 - 349 Class AB1 (8930):
5、350 500 250 250 30 - 349 Test conditions: - - - - 120 3/ - _ GENERAL: Qualification: Required. This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III. _ * Type 8930 replaces tube types: EIMAC 8930 and X651Z Amperex DX393 ITT 504809-1 AMSC N/A FSC 5960 IN
6、CH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1385K 2 TABLE I. Testing and inspection. Inspection Method Type Conditions Symbol Limits Unit MIL-STD-1311 Min Max Conformance inspection, part 1 Electrode current (screen) 1256 Both
7、Ic2 -7.0 +3.0 mA dc Electrode voltage (grid) 1261 Both Eb = 2,000 V dc; Ec2 = 400 V dc; Ec1/Ib = 67 mA dc Ec1 -70 -100 V dc Total grid current 1266 7580W Eb = 2,000 V dc; Ib = 125 mA dc 14/ Ic1 - -15 A dc 8930 Eb = 2,500 V dc; Ec1/Ib = 140 mA dc 14/ Ic1 - -15 A dc Primary-grid emission (control) 126
8、6 Both Ic1 = 70 mA dc; t = 120; anode and screen-grid floating Isg1 - -250 A dc Primary-grid emission (screen) 1266 Both Ec1 = 0; t = 120; Ic2 = 100 mA dc; anode floating Isg2 - -250 A dc Heater current 1301 Both If 2.30 2.90 A ac Pulse emission 2212 Both Eb = Ec2 = 250 V dc; Ec1 = -100 V dc; egk/ik
9、 = 1.5 a; prr = 11 1; tp = 4,500 s (min); Ef = 5.4 V ac; tr = tf = 25 s; slope = 0.5 percent; ripple = 0.1 percent ik - 200 ma Current division (long pulse method A) 1372 Both Eb = Ec2 = 250 V dc; Ec1 = -100 V dc; egk/ib = 1.0 a; prr = 11 1; tp = 4,500 s (min) egk ic1 ic2 2.0 - - 9.0 150 260 v ma ma
10、 Interelement leakage (1) - 8930 Grid-cathode; C = 0.25 F; E = 400 V dc 8/ I I - - +1.5 -1.5 A dc A dc Interelement leakage (2) - 8930 Grid-screen; C = 0.25 F; E = 1,000 V dc 8/ I I - - +1.5 -1.5 A dc A dc Interelement leakage (3) - 8930 Anode-screen; C = 0.001 F; E = 8.0 kV dc 8/ I - 5.5 A dc See f
11、ootnotes at end of table. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1385K 3 TABLE I. Testing and inspection - Continued. Inspection Method Type Conditions Symbol Limits Unit MIL-STD-1311 Min Max Conformance inspection, part 2 Direct-i
12、nterelectrode capacitance 1331 Both Cgp Cin Cout - 16.0 4.2 0.06 18.5 5.2 pF pF pF Heater-cathode leakage 1336 Both Ehk = +150 V dc; Ehk = -150 V dc 10/ Ihk Ihk - - +150 -150 A dc A dc RF useful output power 2214 7580W Class C amplifier; F = 470 to 500 MHz; Eb = 2,000 V dc; Ec1 = -90 V dc; Ec2 = 250
13、 to 300 V dc; Ic1 = 25 mA dc (max); Eg1/Ib = 250 mA dc; Ef = 5.5 V ac 11/ Po 225 - W Conformance inspection, part 3 Life test (2) - 7580W Group C; AB1 amplifier; Eb = 2,000 V dc; Ec2 = 400 V dc; Ec1/Ibo = 75 mA dc; Eg1/Ib = 250 mA dc; RL = 4,000 100 ohms; anode tank Q = 10 to 15; F = 2 MHz (min), 10
14、 MHz (max); t = 500 hours 7/ Po (initial) 250 - W (useful) Life-test (2) end points: Linear amplifier power output and distortion Life test (2) - 2204 - 7580W 7/ 7/ 3rd IM 5th IM Ib Po -22 -27 - 225 - - 40 - dB dB mA dc W (useful) Life test (1) - 7580W RF useful output power; t = 500 hours 4/ - - -
15、- Life-test (1) end points: Pulse emission Heater-cathode leakage Primary grid emission (control) Primary grid emission (screen) - 2212 1336 1266 1266 Ef = 6.0 V ac Ehk = +150 V dc Ehk = -150 V dc ik Ihk Ihk Isg1 Isg2 - - - - - 100 150 150 -250 -250 ma A dc A dc A dc A dc See footnotes at end of tab
16、le. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1385K 4 TABLE I. Testing and inspection - Continued. Inspection Method Type Conditions Symbol Limits Unit MIL-STD-1311 Min Max Conformance inspection, part 3 - Continued Cooling - 7580W Ec
17、1/Ib = 250 mA dc 4/ 5/ T (anode core) - 250 C 8930 Eb = 1,400 V dc; Ec1/Ib = 250 mA dc 4/ 5/ T (anode core) - 250 C Pressure drop - 7580W No voltages 4/ 6/ - - 0.35 Inches H2O 8930 No voltages 4/ 6/ - - 0.70 Inches H2O Life test (3) - 7580W Group D; rf useful output power, except air-flow = 1.5 cfm;
18、 t = 100 hours 4/ - - - - Life-test (3) end points: RF useful output power - 2214 Po 200 - W Humidity 1011 7580W 4/ - - - - Humidity end point - Total grid current Ic1 - -15 A dc Vibration, mechanical 1032 7580W Ef = 6.0 V; Ebb = 2,500 V dc; Ec2 = 500 V dc; Rp = 4,900 ohms; Ec1/Ib = 100 mA dc; Accel
19、 = 10 G peak (min); F = 28 to 2,000 to 28 Hz; 4/ 12/ Ep - 30 V ac Vibration, mechanical end points: Total grid current Electrode voltage (grid) - 1266 1261 Ic1 Ec1 - -70 -20 -100 A dc V dc Shock, specified pulse 1042 7580W Eb = 2,000 V dc; Ec2 = 500 V dc Ec1 = -200 V dc; shock = 11 2 ms; accel = 90
20、G peak (min); total impacts = 18 4/ 13/ - - - - See footnotes at end of table. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1385K 5 TABLE I. Testing and inspection - Continued. Inspection Method Type Conditions Symbol Limits Unit MIL-STD
21、-1311 Min Max Conformance inspection, part 3 - Continued Shock, specified pulse end points: Total grid current Electrode voltage (grid) - 1266 1261 Ic1 Ec1 - -70 -20 -100 A dc V dc Linear amplifier power output and distortion 2204 7580W Eb = 2,000 V dc; Ec2 = 400 V dc; Ec1/Ibo = 75 mA dc; Eg1/Ib = 2
22、50 mA dc 1-tone; RL = 4,000 100 ohms; Rg = 1,000 ohms (max); F = 2 MHz (min), 10 Mhz (max); anode tank Q = 10 to 15; t = 180 (min) 4/ Po 3rd IM 5th IM 250 -22 -27 - - - W (useful) dB dB 1/ To obtain maximum life, it is necessary to adjust heater voltage to values indicated below at the indicated fre
23、quencies of operation. These figures are for straight-through amplifier operation. In no case shall the heater be operated at less than 5.4 volts. Frequency (MHz) Ef (V ac) 300 or lower 6.00 301 to 400 5.75 401 to 500 5.50 It is recommended that the heater voltage be maintained within 5 percent when
24、 consistent operation and extended tube life are factors. This applies to both nominal and derated voltages. 2/ At the specified anode dissipation and an incoming air temperature of 25C maximum, a minimum airflow, as specified, shall pass through the anode cooler. At this flow-rate, the static press
25、ure drop across the tube and socket, with an appropriate chimney (air director) around the anode cooler, is approximately as specified below. 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 th
26、an 100 volts and frequencies less than 500 MHz. Air 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 shall be used and maximum seal and anode co
27、re temperature ratings shall not be exceeded. The airflow shall be applied before or simultaneously with electrode voltages, and may be removed simultaneously with them. Where emphasis is placed on long and reliable life, cooling in excess of minimum requirements shall be used. Type Anode dissipatio
28、n (watts) Airflow (cfm) Static pressure drop (inch of water at sea level) Socket 7580W 8930 250 350 3.8 6.0 0.30 0.60 246-JAN 246-JAN 3/ In all electrical tests involving application of heater voltage, the use of an air-system socket and forced-air cooling is permissible. 4/ This test shall be perfo
29、rmed 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 as a part of conformance inspection, part 2, acceptance level 6.5 of MIL-PRF-1 Table III . The yearly sampling plan may be r
30、einstated after three consecutive samples have been accepted. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1385K 6 TABLE I. Testing and inspection - Continued. 5/ The cooling test shall be made as follows: At an ambient temperature of 25
31、C, both base and anode shall be cooled by applying an airflow of; 7580W, 3.8 cfm maximum; 8930, 6.0 cfm maximum; at sea level from a single source using the infinite baffle system as shown on figure 2, or equivalent. At the specified test conditions, the anode core temperature shall not exceed the s
32、pecified limit. Temperature shall be measured by means of a thermocouple, located as follows: The thermocouple shall be embedded in the top of the anode 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 therm
33、ocouple junction therein, and then peening the edges of the hole so as to hold the thermocouple firmly in place. Good electrical continuity between the thermocouple and the metal area in close proximity shall be demonstrated before the cooling test can be performed. 6/ An infinite baffle system as s
34、hown on figure 2, or equivalent, shall be used. Airflow shall be as follows: Type 7580W, 3.8 cfm at sea level; Type 8930, 6.0 cfm at sea level. The static pressure drop is measured across the tube and socket, with an air director (chimney) in place, to direct the total airflow through the anode cool
35、er assembly of the tube under test (TUT). 7/ During the performance of life test (2), the rf grid driving voltage and the bias voltage shall be monitored and held constant. The bias voltage shall be adjusted to produce the specified value of Ibo and the rf drive shall be adjusted to produce the spec
36、ified anode current of 250 mA dc during an initial adjustment period not to exceed 4 hours. In no case shall the grid be driven positive with respect to the cathode as indicated by a grid current of 50 A dc maximum. At the conclusion of the life-test period, the change in anode current from the init
37、ial value (Ib), and the power output (Po) shall be noted and the tube shall meet the listed requirements for these parameters. Prior to the performance of life test (2), the tube shall have met the requirements of the linear amplifier power output and distortion test. A record shall be kept of the b
38、ias voltage used to produce the specified Ibo and the amplitude of the two-tone driving signal used in the distortion test initially, and when life test (2) is completed, the third and fifth IM distortion shall again be measured, using this same value of bias voltage (irrespective of the value of Ib
39、o this voltage may produce) and this same value of drive signal, and the tube shall meet the listed end-point requirements. 8/ No other voltages shall be applied except for the test value shown. The test voltage, with the indicated polarity, shall be held for 30 seconds minimum, with no apparent arc
40、ing and a leakage current not to exceed the limit shown (see figure 4). 9/ Tube type 8930 is produced by using a larger diameter cooler on the basic 7580W tube which has met all the requirements listed herein. After replacement with the larger cooler, the 8930 tube shall meet the additional requirem
41、ents as specified herein. 10/ The leakage current reading shall be taken during the 3 minutes immediately following the required 2-minute warmup period. 11/ Circuit and cavity shall be in accordance with Drawing 223-JAN. 12/ Each TUT shall be subjected to one sweep cycle in each of the three axes X,
42、 Y, and Z. The X axis shall be defined as normal to a plane drawn through base pins No. 1 and 5. The Y axis shall be defined as normal to a plane drawn through base pins No. 3 and 7. One sweep cycle (28 to 2,000 and return to 28 Hz) shall be covered in 6 to 12 minutes. The specified voltages shall b
43、e applied during the test using the basic test circuit shown on figure 3. Tubes found to electrically oscillate for causes other than vibration shall not be tested nor rejected on this test. Each tube shall be vibrated for 60 seconds at the frequency which gives the maximum vibration (noise) output
44、voltage in each of the three axes. If at the end of the 60 seconds the vibration output voltage is increasing, the vibration shall be continued until there is no further increase. The tubes shall not show noise-voltage output in excess of the maximum limit specified, except one intermittent short pe
45、r tube shall be allowable during this test. In addition to reading noise voltage output on the HP400D, or equivalent, a permanent recording shall be made using a good-quality recorder to produce a plot of noise voltage versus frequency. Noise-voltage amplifiers used with the recorder shall have a 1
46、dB frequency response over the range to be measured and the overall recording equipment shall be capable of fast response in order to show sharp noise voltage spikes resulting from internal tube resonances or other phenomena. Prominent noise peaks indicated on the recording shall be individually inv
47、estigated by fixed-frequency operation, and the 60-second operation shall be made at the frequency of highest noise as so selected. Frequency at the extremes of the sweep shall be read with an accuracy of 1 Hz below 100 Hz and 1 percent above 100Hz. 13/ The tube shall be subjected to the specified a
48、cceleration in the X, Y, and Z axes, with six shocks in each axis. Tubes showing any permanent shorts, or more than one temporary short during the test, shall be rejected. The applied shock shall be an approximate half-sine wave motion with duration measured at the zero axis level. 14/ This test is to be the first test performed at the conclusion
