1、 MIL-PRF-1/1458E 27 July 2009 _ _ SUPERSEDING MIL-PRF-1/1458D 25 June 1999 PERFORMANCE SPECIFICATION SHEET ELECTRON TUBE, RECEIVING TYPE 7788 This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring the electron tube describe
2、d herein shall consist of this document and the latest issue of MIL-PRF-1. DESCRIPTION: Pentode, miniature, RF, sharp cutoff, high transconductance Outline - 6-2 (EIA) Base - E9-1 Envelope - T6-1/2 Cathode - Coated unipotential Base connections: Pin No. 1 2 3 4 5 6 7 8 9 Element k g1 k h h g2 a g3 g
3、2 ABSOLUTE RATINGS: Parameter: Ef Eb Ec1 Ec2 Ec3 Ehk egk Rg1 Unit: V V dc V dc V dc V dc v v Meg Maximum: Minimum: 6.6 6.0 250 - -25 - 165 - 0 - 100 - 50 - 1/ - Test conditions: 6.3 135 +12.5 165 0 0 - - ABSOLUTE RATINGS: Parameter: Ik Pg1 Pp Pg2 TE Rk Alt Unit: mA dc W W W C Ohms ft Maximum: Minimu
4、m: 50 - 0.01 - 5.0 - 1.0 - +170 - - 2/ - Test conditions: - - - - - 360 - See footnotes at end of table I. _ GENERAL: Qualification Not required AMSC N/A FSC 5960 INCH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1458E 2 TABLE I. T
5、esting and inspection. Inspection Method Conditions AcceptanceSymbolLimits Unit MIL-STD-1311 Level 9/ Min Max First Article Inspection Sweep-frequency vibration 1031 Ebb = 155 V dc; Ec2 = 160 V dc; Rp = 680 ohms; Ec1 = +7 V dc;Rk = 220 ohms unbypassed - Ep - 500 mV dcConformance inspection, part 1 H
6、eater current 1301 0.65 If 320 360 mA Heater-cathode leakage 1336 0.65 Ihk - 13 A dcTotal grid current 1266 3/ 0.65 Ic1 0 -0.1 A dcElectrode current (1) (anode) 1256 Ebb = 120 V dc; Ecc1 = 0; Ecc2 = 150 V dc; Ecc3 = 0; Rk = 47 ohms 0.65 Ib 29.0 41.0 mA dcElectrode current (2) (anode) 1256 Ebb = 120
7、V dc; Ec1 = -6.0 V dc; Ecc3 = 0; Rk = 47 ohms; Ecc2 = 150 V dc 0.65 Ib - 150 A dcElectrode current (screen grid) 1256 0.65 Ic2 4.2 5.8 mA dcTransconductance (1) 1306 0.65 Sm 42,000 58,000 mhosShort and discontinuity detection 1201 egk = 50 v (max) 0.65 - - - - Conformance inspection, part 2 Insulati
8、on of electrodes 1211 E (g1-all) = -50 V dc; E (a-all) = -250 V dc 2.5 2.5 - - - - Transconductance (2) 1306 Ef = 5.7 V 2.5 Sm Ef - 10 % Electrode current (3) (anode) 1256 2.5 Ib 31 39 mA Noise and microphonics 2201 Ehk = 0; Ebb = Ecc2 = 200 Vdc;Ec1 = 0; Ecal = 600 mV ac; Rk = 1,000 ohms; Rp = 0.1 M
9、eg; Rg2 = 0.5 Meg; Cg2 = 2 F 2.5 - - - - Direct-interelectrode capacitance 1331 Shield No. 315 6.5 Cg1p Cin Cout - 12.5 3.7 0.036 17.0 4.5 pF pF pF See footnotes at end of table. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1458E 3 TABLE
10、 I. Testing and inspection - Continued. Inspection Method Conditions AcceptanceSymbol Limits Unit MIL-STD-1311 Level /9 Min Max Conformance inspection, part 2 - Continued High-frequency vibration 1031 Rp = 680 ohms; Eb = 155 V dc;Ec2 = 160 V dc; Ec1 = +7 V dc;Rk = 220 ohms unbypassed 6.5 Ep - 50 mV
11、acShock 1041 450 G 4/ 6.5 - - - - Vibration-fatigue 1031 6.5 - - - - Shock and vibration-fatigue test end points: - - - - - - High-frequency vibration 1031 Rp = 680 ohms; Eb = 155 V dc;Ec2 = 160 V dc; Ec1 = +7 V dc;Rk = 220 ohms unbypassed - Ep - 80 mV acHeater-cathode leakage 1336 - Ihk - 25 A dcTr
12、ansconductance (1) 1306 - Sm 40,000 - mhosTotal grid current 1266 - Ic1 - -0.2 A dcBase strain 1121 6/ - - - - - Envelope strain 2126 2.5 - - - - Permanence of marking 1105 - - - - - Conformance inspection, part 3 Heater-cycling life 1506 Ef = 7.5 V; Ehk = 60 V dc; Eb = Ec1 = Ec2 = 0 - - - - - Heate
13、r-cycling life-test end point: - - - - - - Heater-cathode leakage 1336 - Ihk - 25 A dcStability life 1516 Rk = 360 ohms; Rg1 = 0.47 Meg; TA = room - - - - - Stability life-test end point: - - - - - - Change in transconductance (1) of individual tubes 1306 - Sm t - 15 % Intermittent life 1501 Rk = 36
14、0 ohms; Rg1 = 0.47 Meg 7/ 8/ - - - - - Intermittent life-test end points (500 hours) - 9/ - - - - - See footnotes at end of table. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1458E 4 TABLE I. Testing and inspection - Continued. Inspecti
15、on Method Conditions AcceptanceSymbolLimits Unit MIL-STD-1311 Level /9 Min Max Conformance inspection, part 3 - Continued Total grid current 1266 - Ic1 - -0.9 A dcChange in transconductance (1) of individual tubes 1306 - Sm t - 20 % Transconductance (2) 1306 Ef = 5.7 V - Sm Ef - 15 % Heater-cathode
16、leakage 1336 - Ihk - 25 A dcInsulation of electrodes 1211 E (g1-all) = -50 V dc E (a-all) = -250 V dc - - - - - Transconductance (1), average change 1306 - Avg Sm t - 15 % Intermittent life-test End points (1,000 hours) - 9/ - - - - - Total grid current 1266 - Ic1 - -0.9 A dcChange in transconductan
17、ce (1) of individual tubes 1306 - Sm t * 25 % Heater-cathode leakage 1336 - Ihk - 25 A dcInsulation of electrodes 1211 E (g1-all) = -50 V dc E (a-all) = -250 V dc - - - - - 1/ Rg1 shall be 0.2 Meg for fixed bias, 0.6 Meg if Rk = 47 ohms, or 3.5 Meg if Rk = 360 ohms. 2/ See “Reduced pressure (altitud
18、e) rating”, and altitude, maximum peak voltage in the basic document. 3/ This test shall be performed at the conclusion of the holding period. 4/ A grid resistor of 0.1 Meg shall be added, except when a thyratron-type short indicator is used. 5/ This test shall be conducted on the initial lot and th
19、ereafter on a lot approximately every 12 months. When one lot has passed, the 12-month rule shall apply. In the event of lot failure, the lot shall be rejected and the succeeding lots shall be subjected to this test until a lot passes. 6/ Acceptance sampling procedure shall be in accordance with met
20、hod 1121, except that acceptance and rejection criteria shall be modified as follows: a Accepted if not more than one defective for class, A, B, or C defects, respectively, or if not more than a total of two defectives are found in the sample b. Rejected if two or more defectives for class A, B, or
21、C defects, respectively, or if a total of three or more defectives are found in the sample 7/ Envelope temperature (TE) requirements, when measured in accordance with the temperature by conduction-band measurement (method 1226), will be satisfied if a TUT having bogey Ib (5 percent) under normal tes
22、t conditions, is determined to operate at or above minimum specified temperature at any position in the life-test rack. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1458E 5 TABLE I. Testing and inspection - Continued. 8/ The life-test sa
23、mple shall consist of 20 tubes per lot and not 1 tube failure shall be permitted. In the event of rejection of the first sample, a second sample of 40 tubes shall be selected from the lot. Acceptance shall then be based on the combined first and second samples and shall not exceed a total of one tub
24、e failure. 9/ This specification sheet uses accept on zero defect sampling plan in accordance with MIL-PRF-1, table III. Referenced documents. In addition to MIL-PRF-1, this document references the following: MIL-STD-1311 Marginal notations are not used in this revision to identify changes with resp
25、ect to the previous issue due to the extent of the changes. Custodians: Preparing activity: Army - CR DLA - CC Navy - EC Air Force - 85 DLA - CC (Project 5960-2009-023) Review activities: Army - MI Navy - AS, CG, MC, OS, SH 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 http:/assist.daps.dla.mil/. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
