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- Q4748138 subject Q7134689.
- Q4748138 abstract "From 1963 to 1970, Ampex manufactured several models of VTR 2-inch helical VTRs, capable of recording and playing back analog black and white video. Recording employed non-segmented helical scanning, with one wrap of the tape around the video head drum being a little more than 180 degrees, using two video heads. One video drum rotation time was two fields of video. The units had two audio tracks recorded on the top edge of the tape, with a control track recorded on the tape's bottom edge. The 2-inch-wide video tape used was one mil (0.001 in or 0.0254 mm) thick. The VTRs were mostly used by industrial companies, educational institutions, and a few for in-flight entertainment.The capstan tape speed is 3.7 inches per second, which provided a long record time of up to five hours on large reels. The units were 100% solid state. The Ampex 2-inch helical VTRs were popular, as they were priced much less than the 2-inch quadruplex videotape recorders used in the broadcast television industry at the time.".
- Q4748138 wikiPageExternalLink camcord_formats_history.htm.
- Q4748138 wikiPageExternalLink 2-inch-ampex-vr-660.html.
- Q4748138 wikiPageExternalLink museum.
- Q4748138 wikiPageExternalLink Ampex-Corporation-Company-History.html.
- Q4748138 wikiPageExternalLink Ampex_VR-1500.htm.
- Q4748138 wikiPageExternalLink Cat_Ampex.htm.
- Q4748138 wikiPageExternalLink Cat_Sony002.htm.
- Q4748138 wikiPageExternalLink Museum012.htm.
- Q4748138 wikiPageExternalLink VTR-Museum_001.htm.
- Q4748138 wikiPageExternalLink ampexmis.html.
- Q4748138 wikiPageExternalLink ampex.htm.
- Q4748138 wikiPageExternalLink 1-14.html.
- Q4748138 wikiPageExternalLink sonyhistory-d.html.
- Q4748138 wikiPageExternalLink ampex-story-teil6.html.
- Q4748138 wikiPageExternalLink electronics-ads-misc-years.
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- Q4748138 wikiPageWikiLink Q7134689.
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- Q4748138 comment "From 1963 to 1970, Ampex manufactured several models of VTR 2-inch helical VTRs, capable of recording and playing back analog black and white video. Recording employed non-segmented helical scanning, with one wrap of the tape around the video head drum being a little more than 180 degrees, using two video heads. One video drum rotation time was two fields of video. The units had two audio tracks recorded on the top edge of the tape, with a control track recorded on the tape's bottom edge.".
- Q4748138 label "Ampex 2 inch helical VTR".