{"e":{"id":285136,"source":"ia_catalogofcopyri331213libr","title":"ELECTRONIC TUBES","header":" (Radio Electronics. Reel lesson 8) De Forest’s Training, Inc., 1948. 100 feet, b&w, 16mm. Summary: Actions, functions, and characteristics of the vacuum tube. Shows that since the changes of grid voltage can be duplicated only by larger changes of plate voltage, the triode tube acts as an amplifier","year":1948,"reels":null,"feet":null,"sound":false,"credits":null,"notes":[],"line_start":3995,"line_end":4007,"source_text":"ELECTRONIC TUBES. (Radio Electron- \nics. Reel lesson 8) De Forest’s Train- \ning, Inc., 1948. 100 feet, b&w, 16mm. \n\nSummary: Actions, functions, and \ncharacteristics of the vacuum tube. \nShows that since the changes of grid \nvoltage can be duplicated only by larger \nchanges of plate voltage, the triode \ntube acts as an amplifier. \n\n© De Forest’s Training, Inc.; 10ct48; \nMP3901. ","source_meta":{"name":"Catalog of Copyright Entries, Third Series, Parts 12–13: Motion Pictures, 1949","url":"https://archive.org/details/catalogofcopyri331213libr","cite":"Internet Archive catalogofcopyri331213libr (OCR text)","file":"/root/projects/publicreel/data/raw/cce_third_series/1949_catalogofcopyri331213libr_djvu.txt"},"ia_items":[],"ia_lookup":[],"atlas":[]},"regs":[{"id":304043,"entry_id":285136,"reg_number":"MP3901","series":3,"see_also":[],"reg_class":"MP","published":true,"claimant":"De Forest’s Training, Inc","author":null,"deposit":null,"reg_date":"1948-10-01","part":null,"part_title":null,"source_line":4006,"raw":"Actions, functions, and characteristics of the vacuum tube. Shows that since the changes of grid voltage can be duplicated only by larger changes of plate voltage, the triode tube acts as an amplifier © De Forest’s Training, Inc.; 10ct48; MP3901","flags":[],"status":"no-renewal-found","pd_date":"1977-01-01","reason":"no renewal entry found for 1975-1977 in the CCE motion-picture renewal sections","match_kind":null,"match_confidence":null,"title_similarity":null,"renewals":[],"window":[1975,1976],"window_volumes":[{"year":1975,"ia_identifier":"catalogofcopyrig3291213libr"},{"year":1976,"ia_identifier":"1976motionpictur3301213libr"},{"year":1977,"ia_identifier":"1977motionpictur3311213libr"}]}]}