gained numerous uses in television production including outside broadcasts where it was used for instant replays and creating programme titles. 1-inch machines were considerably smaller and more reliable than preceding two-inch versions and were seen by operators as a major technological breakthrough. Due to this smaller size, it was possible for OB crews to transport and use multiple machines, allowing for much more complex editing to be done on site for use within the programme. The quality and reliability of 1–inch Type C made it a mainstay in television and video production in television studios for almost 20 years, before being supplanted by more reliable digital videocassette formats like Digital Betacam, DVCAM, and DVCPRO. 1–inch Type C was also widely used for the mastering of early LaserDisc titles. It was replaced in that role by the digital D-2 videocassette format in the late 1980s. Ampex models Models include: VPR-2 1976, studio model VPR-20 1977, Portable VPR-2A studio model VPR-2B studio model VPR-80 studio model VPR-6 studio model SMC-60 slow Motion system VPR-3 studio model, with air system like AVR-1 XVR-80 wideband VTR VPR-5 portable made in jointly with Nagra Marconi models Models include: MR2 studio model Sony models Models include: BVH-1000 1979 studio model BVH-1100 with Dynamic head Tracking- DT, with digital TBC Model BVT-2000 BVH-1180 with Dynamic head Tracking- DT, with digital TBC Model BVT-2000 BVH-500 portable BVH-2000 studio model BVH-2180 3-hour record / play capability BVH-2500 Delta Time VTR BVH-2800/2 VTR With PCM Audio BVH-2830 VTR with PCM Audio and 3-hour record / play capability BVH-3000 Studio model BVH-3100 Studio model without sync channel record / play capability Hitachi, Ltd. – Shibaden models Models include: HR-200 Studio model HR-230 2 and 3 hour Record/Play Studio model HR-100 portable model, 42 pounds NEC models Models include: TT-7000 Studio VTR ($38,000 new in 1987) RCA models Models include: TH-100 was a re-badged Sony BVH-1000. TH-200A was a re-badged Sony BVH-1100A. TH-50 was re-badged Sony portable. TR-800 was an RCA engineered and built VTR, likely why it has the "TR-" designation, as all the RCA Quad recorders did. While the TR-800 was developed by RCA, the scanner assembly and upper drum could be replaced with Sony BVH-1100A parts. In 1983, RCA turned to Ampex for supply of Helical VTRs. TH-400 was a re-badged Ampex VPR-80 TH-900 was a re-badged Ampex VPR-3 TH-700 was a re-badged Ampex VPR-6 3M models Models include: