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    "localId": "486498091",
    "label": "Report, OSI - 3/49, Central Intelligence Agency, Vacuum Tube Development at Oberspreewerke and Its Significance to Soviet Electronic Developments",
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    "title": "Report, OSI - 3/49, Central Intelligence Agency, Vacuum Tube Development at Oberspreewerke and Its Significance to Soviet Electronic Developments",
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    "productionDates": [
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            "day": 28,
            "logicalDate": "1949-10-28",
            "month": 10,
            "year": 1949
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{
    "seq": 13,
    "pageIndex": 0,
    "type": "photo",
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    "ocrText": "SECRET\nTube No.\nDescription\n1947\n1948*\n5. Other vacuum tubes\n5D21\nTetrode radar modulator\n960\n6AC7\nTV amplifier pentode\n20400\n80000\n6AC70\nTV amplifier pentode\n15600\n-\n6AG7\nVideo power amplifier pentode\n7200\n20000\n6AG70\nVideo power amplifier pentode\n6000\n-\n6J6\nTwin triode\n9600\n2000\n829B\nBeam-power amplifier\n(350)\n1000\nLK715A\nRaytheon tube which was revised to make the 5D21\n-\n6000\nOSW2332\nZero-slot magnetron\n175*\n-\nSTV150/40\nStabilizer or rectifier\n6000*\n-\nTe5\nStabilizer or rectifier\n16000*\n-\nB. Radio-measuring instruments\nOSW2113 Thermal element for maintaining constant\nvoltage. Nominal voltage 2 V+30% at 0.1-2.0 ma\n7200\n-\nOSW2183 Bolometer\n600\n-\nBolometric equipment, 3-10 cm\n-\n-\nSpectrum analysers, 3-10 cm\n-\n-\n-\nField-strength meters, 3-10 cm\n-\n-\n-\nTube wavemeters, 3-10 cm\n-\n-\n-\nPrecision wavemeters, 3-10 cm\n-\n-\nC. Detectors\nED704\nCrystal detector\n5000*\n-\nED705\nCrystal detector\n-\n-\nED707\nCrystal detector\n-\n-\nD. High-temperature furnaces\n-\nConveyor furnace for 1200°C (100 X 1000 cm)\n-\n-\n-\nDouble-tube furnace for 1200°C (100 X 1000 cm)\n-\n-\nE. Refractory metals\n-\nTungsten wire of small diam.\n600 km\n-\n-\nTungsten wire, 0.24-0.1 mm\n250 km\n-\n-\nTungsten wire, 5-0.24 mm\n120 kg\n-\n-\nMolybdenum wire of small diam.\n600 km\n-\n-\nMolybdenum wire, crude types\n175 km\n-\nIndications are that at least 200 different projects have been worked on from\neither the development or the production standpoint. Of these, approximately 10 percent\n(included in the above tabulation along with other items) has been in significantly heavy\nproduction.\nA report commenting on production up to 18 April 1947 stated that 2500 klystrons\nfor 9 and 3 cm, 5000 detectors, several hundred special detectors for millimeter waves\n(probably 8 mm), several hundred special oscillograph tubes, and several hundred blue-\ntrace tubes had been produced. It is estimated that approximately 100,000 tubes of all\nkinds were produced during 1947 by the OSW factory.\nRadical price reductions (up to 50 percent and more in some cases) are said\nto have occurred between January 1947 and January 1948 as the result of improved\nmass-production methods. The rate of rejection of tubes fell from 50 percent to 30\npercent. The tubes all carried the OSW trademark and Russian nameplate data.\n- 9 -\nSECRET"
}