1、AMSC N/A FSC 5960 INCH-POUND MIL-PRF-1/1165F 2 December 2008 SUPERSEDING MIL-E-1/1165E 15 June 1981 PERFORMACE SPECIFICATION SHEET ELECTRON TUBE, RECEIVING TYPE 6948 This specification is approved for use by all Depart- ments and Agencies of the Department of Defense. The requirements for acquiring
2、the electron tube described herein shall consist of this document and the latest issue of MIL-PRF-1. DESCRIPTION: Double triode, subminiature, high Mu Outline 3-11 (EIA). Base E8-10 Envelope T3 Cathode Coated unipotential Base connections Pin No. - 1 2 3 4 5 6 7 8 Element - 2a 2g H 2k 1k H 1g 1a ABS
3、OLUTE- MAXIMUM RATINGS: Parameter: Ef Eb eb Ec Ehk Rk/k t Unit: V Vdc v Vdc V Ohms sec Maximum 6.9 250 360 0,-55 200 - - Minimum 5.5 - - - - - - Absolute Maximum for Accelerated Warmup: 9.5 - - - 150 - 10 Test conditions 6.3 100 - 0 0 1,500 - ABSOLUTE RATINGS: Parameter: Cycles Rg/g Ik/k Pp/a TE Alt
4、 Radiation Unit: - Meg mAdc W C ft NVT NV Maximum - 1.0 10 0.5 250 Note 1 1016 1012 Minimum - - - - - - - Absolute maximum for accelerated warmup: 50 - - - - - - Test conditions - - - - - - - GENERAL: Qualification Not Required Reliable tube Inactive for new design after 21 July 1997 Provided by IHS
5、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1165F 2TABLE I. Testing and inspection. Limits Inspection MIL-STD-1311 Method Notes Conditions Acceptance level 16/ Symbol Min Max Unit Radiation rating Conformance inspection, part 1 Heater current Heater-C
6、athode leakage Total grid current Electrode current (1) (anode) Electrode current (2 (anode) Transconductance (1) Short and discontinuity detection - 1301 1336 1266 1256 1256 1306 1201 2 3 3, 4 3 3 3 - Eh = 150 Vdc; Ec = -1.5 Vdc; Rk = 0; Rg = 1.0 Meg Ec = -3.5 Vdc; Rk = 0 - 0.4 0.4 0.4 0.4 0.4 0.4
7、0.4 - If Ihk Ic Ib Ib Sm - - 330 - 0 0.50 - 1,350 - - 370 15.0 -0.3 1.10 50 1,950- - mA Adc Adc mAdcAdc ohms- Conformance inspection, part 2 Insulation of electrodes Electrode current (1) (anode) (difference between sections) Transconductance (2) Grid emission Audio Frequency noise Noise and microph
8、onics (hum) Operation time Amplification factor AC amplification 1211 1256 1306 1266 1246 2201 - 1316 1321 3 3 3, 5 6, 7 3, 8 3, 16 3 3 Ef = 5.5 V Ef = 7.5 V; Ec = - 3.5 Vdc; Rg = 1.0 Meg; Rk = 0 Ecal = 45 mVdc; Rg = 0.1 Meg Rk= 750 ohms; Rp = 0.2 Meg Ef = 6.3 Vac at 400 Hz; Eb = Ec = 0; Rk/k = 5,00
9、0 ohms Ebb = 100 Vdc; Ecc = 0; Rk =0; Esig = 0.2 Vac 2.5 2.5 2.5 2.5 2.5 2.5 6.5 6.5 6.5 R Ib Sm Ef Ic EB - t Mu Ep 500 - - 0 - - - - 60 7.5 - 0.2 15 -0.5 - 15 20 85 - MegmAdc% Adc - mvppsec - Vdc Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P
10、RF-1/1165F 3TABLE I. Testing and inspection. Continued Limits Inspection MIL-STD-1311 Method Notes Conditions Acceptancelevel 16/ Symbol Min Max Unit Conformance inspection, part 2 - Continued Direct- interelectrode capacitance High- frequency vibration White noise Lead fatigue Shock Sweep-frequency
11、 vibration fatigue-test end points High-frequency vibration Heater-cathode leakage Transconductance (1) Change of individua tubes Envelope strain Permanence of marking 1331 1031 - 1116 1041 - 1031 1336 1306 2126 1105 3 3 3 3, 9 10 3 3 3 No Shield No Shield No Shield (Triode 1) No Shield (Triode 2) N
12、o Shield No Shield Rp = 10,000 ohms Peak accel = 15G; Rp = 10,000 ohms Accel = 750 G F = 30 to 3,000 Hz; t = 3 minutes Rp = 10,000 ohms 6.5 1.0 2.5 2.5 2.5 15 6.5 - - - 4.0 - Cgp Cin Cout Cout Cgg Cpp Ep ep Ep - - - Ep Ink Sm T - - 0.55 1.2 0.15 0.19 - - - - - - - - - - - - - 0.95 2.0 0.25 0.31 0.01
13、4 0.86 10 60 10 - - - 50 15 20 - - pF PF pF pF pF pF mVac mvpp mV - - - mVac Adc % - - Conformance inspection, part 3 Heater-cycling life (1) Heater-cycling life (2) Heater-cycling life (1) and (2) test end points: Heater-cathode leakage Insulation of electrodes 1506 1506 - 1336 1211 3 3 Ef = 7.0V,
14、1 minute on, 4 minute off; Ehk = 140 Vac; Eb= Ec = 0 Ef = 8.5 V, 10 seconds on, 4 minutes (min) off; 300 cycle; Ehk = 150 Vdc; Eb = Ec = 0 2.5 10 - - Ihk R - - - 50 - - 15 - - - Adc MegProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1165F 4
15、TABLE I. Testing and inspection. Continued NOTES: 1. See “Reduced pressure (altitude) rating,” and altitude, maximum peak voltage in the basic document. 2. This test shall be conducted in a suitable reactor with the required intensity and dosage that is not less than 10 percent of the specified rati
16、ng. Before and after irradiation , the tubes under test (TUT) shall be within the specified limits for all electrical tests listed herein under quality conformance inspection, part 1. 3. Test each unit separately. 4. This test shall be performed at the conclusion of the holding period. Limits Inspec
17、tion MIL-STD-1311 Method Notes Conditions Acceptancelevel 17 Symbol Min Max Unit Conformance inspection, part 3 - Continued Stability life Stability life-test end point: Transcoductance (1). Change of individual tubes Intermittent life Intermittent life-test end points: (200 hours); Total grid curre
18、nt Heater current Transconductance (1), Change of individual tubes Transconductance (2) Heater-cathod leakage Insulation of electrodes Tansconductance (1), average change 1516 - 1306 1501 - 1266 1301 1306 1306 1336 1211 1306 3 12, 16 13 3 3 3 3 3 Ebb = 250 Vdc; Rk/k = 270 ohms; Ehk = 200 Vdc; Rg/g =
19、 1.0 Meg Rp/a = 30,000 ohms; TA = room; Rhk = 5,000 ohms Ebb = 250 Vdc; Rk/k = 270 ohms; Ekk = 200 Vdc; Rg/g = 1.0 Meg; Rp/a = 30,000 ohms; Rnk = 5,000 ohms; TE = 250 C (min); Eb = 150 Vdc; Ec = -1.5 Vdcl Rk = 0; Rg= 1.0 Meg Ef = 5.5 V - - - Sm t - Ic If Sm t Sm Ef Ihk R Avg Sm t - - 0 330 - - - 200
20、 - 15 - -1.0 380 25 20 15 - 15 % - Adc mA % % Adc Meg % Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/1165F 55. Prior to this test, the tubes under test (TUT) shall be preheated for 5 minutes at the conditions specified below. Test with i
21、n 3 seconds after preheating. The 3-minute test shall not be permitted. Grid emission shall be the last test performed on the sample selected for the grid emission test. Ef Eb Ec Rk/k Rg/g V Vdc Vdc Ohms Meg 7.5 250 0 1,300 1.0 6. Tie 1k to 2k; 1 g to 2g; and 1a to 2a. 7. The rejection level shall b
22、e set at the VU meter reading obtained during calibration. 8. Maximum total distortion of the filament supple voltage shall be 5 percent. The frequency response of the peak-to-peak measuring device from 20 to 5,000 Hz shall be within 0.5 dB of its response at 400Hz. Ground leads except those for the
23、 cathode and heater lead No. 3. Measure hum voltage across specified Rk. 9. The tube shall be rigidly mounted on at able vibrating so that the instantaneous values of acceleration shall constitute approximately a “ white noise” spectrum which is free from discontinuities from 100 to 5,000 Hz and suc
24、h that the rms value of acceleration for frequencies outside this band shall constitute no more than 5 percent of the total rms acceleration. The spectrum of instantaneous acceleration shall be such that each octave of bandwidth delivers 2.3 0.2 Gs rms acceleration. With this the case the rms value
25、of acceleration for any bandwidth within the spectrum is equal to: )1/2(log32.33.210FFGRMGrms Where F2 and F1 are the upper and lower frequencies respectively of the band under consideration. The degree of clipping of the clipping of the peak accelerations shall be such that the peak value of accele
26、rations shall be such that the peak value of acceleration is at least 15 Gs. Half the tubes in the sample shall be vibrated in position X, the other half in position Y. The voltage (ep) produced across the resistor (Rp) as a result of vibration shall be coupled through a compensation amplifier to a
27、low-pass filter. The compensating amplifier shall have a high-input impedance (250 K ohms or more) and shall be adjusted to compensate for any insertion losses in the filter. The combined frequency response of amplifier and filter shall be flat within 0.5 dB from 50 to 8,000 Hz, shall be down no mor
28、e than 5 dB at 10,000 Hz and 20 Hz, and down at least 30 dB at 13,000 Hz. For reading peak-to-peak value of output voltage, the filter output shall be fed directly to the input of a Ballantine Model 305 peak-to-peak Electronic Voltmeter, or equal, while the rms value shall be measured with the Hewle
29、tt Packard Model 400 c, or equal. The impedance of the anode and screen voltage supplies shall not exceed that of a 40 F capacitor at 10 Hz. 10. A grid resistor of 0.1 Meg shall be added except when a thyratron-type short indicator is used. 11. This test shall be conducted on the initial lot and the
30、reafter on a lot approximately every 12 months. When on lot has passed, the 12-month rule shall apply. In the event of lot failure, the lat shall be rejected and the succeeding lots shall be subjected to this test until a lot passes. 12. Envelope temperature (TE) requirements, when measured in accor
31、dance with the temperature by conduction-band measurements (MIL-STD-1311 method 1226), will be satisfied if a TUT having bogey Ib ( 5 percent) under normal test conditions, is determined to operate at or above minimum specified temperature at any position in the life-test rack. 13. The allowable def
32、ectives per characteristic shall not be greater than 1 for first sample and shall not be greater than 3 for combined samples. Total defective shall be 2 and 5, respectively. 14. Revision letters are not used in this revision to identify changes with respect to the previous issue, due to the extensiv
33、eness of the changes. 15. Insert a cold tube into the test socket having all electrode current (1) (anode) conditions applied and record Ib continuously for 3 minutes. Ib shall reach 85 percent of the 3 minutes figure within the time indicated. 16. The life-test sample shall consist of 20 tubes per
34、lot and not tube failure shall be permitted. In the event of rejection of the first sample, a second sample of 40 tubes shall be elected from the lot. Acceptance shall then be based on the second samples and there shall be zero tube failures. 17. This specification sheet utilizes an accept on zero d
35、efect 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-1/1165F 6Referenced documents. In addition to MIL-PRF-1, this document references the following: MIL-STD-1311 Marginal notations are
36、not used in this revision to identify changes with respect to the previous issue due to the extent of the changes. Custodians: Preparing activity: Army CR DLA- CC Navy EC Project number (5960-2008-069) Air Force 85 Review activities: Navy AS, CG, MC, OS, SH Air Force 99 NOTE: The activities listed a
37、bove 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-,-,-
