<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><head></head><blockquote class="webkit-indent-blockquote" style="margin: 0 0 0 40px; border: none; padding: 0px;"><blockquote class="webkit-indent-blockquote" style="margin: 0 0 0 40px; border: none; padding: 0px;"><div></div></blockquote></blockquote><div><br></div><blockquote class="webkit-indent-blockquote" style="margin: 0 0 0 40px; border: none; padding: 0px;"><div>Each machine had input routing so that the incoming network regular and backup lines, all NBC Burbank studios, and test signals.</div><div><br></div><div>Each machine's output routing could feed playback to any Burbank studio for production, and four different "delay" feeds: One-hour delay for the Midwest, three-hour delay for the West Coast, a two-hour delay for special purposes and a four-hour delay "for future playback to the Pacific Northwest," which didn't observe Daylight time.</div><div><br></div><div>A QC room in the back of the VTR area enabled monitoring of each machine in color and monochrome, and "control of output switching is provided there to permit switching between A and B copy tapes."</div><div><br></div><div>Since the staggered recording/playback plan outlined above doesn't provide for simultaneous main and backup record and play, perhaps there were workflows that enabled that on occasion?</div><div><br></div><div>In addition to the automated "DB Sequence" control outlined above, the Burbank control system enabled preset operation at the machine. </div><div><br></div><div>An operator could arrange for a clock-time selection of input and output routing, record or play operation, start time and duration. After the specified duration, the machine would rewind to the beginning of the recording and stop.</div><div><br></div><blockquote class="webkit-indent-blockquote" style="margin: 0 0 0 40px; border: none; padding: 0px;"><div><i>What's not outlined in the copy of the document I have (unknown number of missing pages) is how the system determined the beginning of the recording. </i></div></blockquote><blockquote class="webkit-indent-blockquote" style="margin: 0 0 0 40px; border: none; padding: 0px;"><div><br></div></blockquote><blockquote class="webkit-indent-blockquote" style="margin: 0 0 0 40px; border: none; padding: 0px;"><div>A guess would be a cue tone automatically put on the cue track at specific locations in order to tell the machine to enter "Stop" so it didn't overshoot the head of tape and unthread... and then enter "Play" to find a cue tone marking the beginning of the recording.</div></blockquote><div><br></div><div>The system also allowed for manual control and input and output selection at the machine, delegation from the machine of studio control... Stop, Play, Record, etc.,</div><div><br></div><div><div><div>Audio and Video AGC amplifiers were used between the input routing switcher handling feeds to the VTRs and each VTR's input. </div></div></div><div><div><div><br></div></div></div><div><div><div>The video AGC amps were developed by NBC and separated luminance and chroma components. Sync was stripped, "the baseline cleaned up and the signal controlled to a particular level," Byloff advised. "In the chrominance channel, the burst is measured and by this means the chrominance is held to a predetermined level." Sync was reshaped and delayed, then added back to the signal before exiting the AGC amp.</div></div></div><div><br></div></blockquote><div><b>Burbank Adds Ten TRT-1AC's:</b></div><div><br></div><div>In the April, 1961 "RCA Broadcast News" issue about "Color Television Progress," NBC Burbank recording engineer Russel A. Nies reports on what was a then recently completed installation of ten new RCA TRT-1AC color VTR's.</div><div><br></div><blockquote class="webkit-indent-blockquote" style="margin: 0 0 0 40px; border: none; padding: 0px;"><div>The ten new machines were arranged in five cubicles. Transports and some of the racks involved faced each other, while the color monitors for QC were at the end of the cubicle.</div><div><br></div><div></div></blockquote></body></html>