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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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{
    "id": "486498091",
    "sourceUrl": "https://catalog.archives.gov/id/486498091",
    "contentType": "document",
    "title": "Report, OSI - 3/49, Central Intelligence Agency, Vacuum Tube Development at Oberspreewerke and Its Significance to Soviet Electronic Developments",
    "citationUrl": "https://catalog.archives.gov/id/486498091",
    "collections": [
        "President's Secretary's Files (Truman Administration)",
        "Intelligence Files"
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{
    "url": "https://catalog.archives.gov/id/486498091",
    "naId": 486498091,
    "levelOfDescription": "item",
    "productionDates": [
        {
            "day": 28,
            "logicalDate": "1949-10-28",
            "month": 10,
            "year": 1949
        }
    ],
    "recordType": "description",
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{
    "seq": 29,
    "pageIndex": 0,
    "type": "photo",
    "url": "https://s3.us-east-1.amazonaws.com/NARAprodstorage/lz/presidential-libraries/truman/hst-psf/602196/875491/875491-02-029.tif",
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    "ocrText": "SECRET\n\"This tube belongs to the 'magnet resonance receivers' (Magnet-Resonanz-\nEmpfang). Suitable results were first obtained with this tube in the OSW. The plan for\nthe development of such a tube originates with Dr. Haban. (Note: In various connections\nthe spellings \"Haban\" and \"Habann\" are both used). The first experimental tube was pro-\nduced in the years 1945-46, without, however, obtaining completely clear-cut measure-\nments of nominal values. After the departure of Dr. Haban to Russia in October 1946\nthe development stopped until the early part of 1947. In May 1947 further experimental\nconstruction was again started on the two construction plans of the tube designated as\nthe SKR87 and SKR90. These two construction plans, designated as Haban Tube Construc-\ntion I (SKR87) and Haban Tube Construction II (SKR90), are differentiated by the fact that\nConstruction I is prepared for one-sided and Construction II for two-sided tunability.\nThe construction of both tubes is characterized by the fact that a suitable, short, direct-\nly heated cathode is situated eccentrically between two outer anode - and inner cylinders,\nand the electron stream passes in between the cylinders in a way determined by the ap-\nplied anode voltage and the existing magnetic field, according to the corresponding lit-\nerature of Dr. Haban.\n\"The development specifications for these tubes, that is, for the development of\nexperimental models, are contained in the periodical supplement of 10 April 1947. Pre-\nliminary technical specifications of the experimental model are according to the system\nof Dr. Haban. The custodian of this tube is the agent of the SMA-Engineer Afanasyev.\n\"Most of the experimental tubes constructed up until now show leakage with static\noperation of the pump\n\"The construction specifications of both the completed tubes SKR87 and SKR90, as\nwell as the tuning control SKG121.20, do not yet display the conditions which will permit\nthem to fulfill the requirements ordered by the Russians.\n\"The whole project must as yet be considered in the development stage.\"\n9. Slotted magnetron\nis an 8-slot magnetron known as type OSW 2585. (This is apparently the tube to which\nA recently mentioned tube on which information is available as of December 1948\nreference made in developments for a fixed wavelength of 1 cm.) No production in-\nformation is was available but the following description has been selected from a rather large\nvolume of material on the subject.\nthe OSW the triode OSW 2004 was developed for the decimeter-wave region and\n\"In 8 For the wavelengths from 1.5 to 10 cm the two tubes OSW 2532A\ndown 2532B to cm. produced. They are unslotted magnetrons. At 1.5 cm they these still give tubes an\noutput rather so that a test oscillator supplied with them is alternate not simple tube at the Al-\nwere of from 20 to 50 milliwatts. However, the handling required for to use. is\nternate complicated tubes which are simpler to adjust are being sought. One 2540. In normal\nlong wavelength 7 but perhaps in the case of properly designed slotted can\nend of the centimeter-wave region is the triode OSW oscillators, it\noperation be it reaches 6 cm, For the region below this down to 3 cm several wire magne-\ntrons have been or capacitively. These tubes are the RD2Mh The\ndriven down to developed cm. by Telefunken in Germany. To these a parallel which or is tunable wave-\nguide is coupled inductively and the RD2Mg which is tunable from 3.1 to 3.3 cm. which is oscillating driven\nfrom 5.5 to 7.5 cm is, as already mentioned, a parallel waveguide handle than the\ncircuit of these tubes the anode system. These tubes are simpler tubes to the anode system zero-\ncapacitively slot through closely connected further development of these In this the radi-\ntubes. In a but in a waveguide cavity which is tunable. way be reached\nation is not in a waveguide is reduced and it is hoped that still shorter reduced. wavelengths can\nwith this damping tube if the capacity of the anode system is\nSECRET\n- 25 -"
}