<html><head><base href="x-msg://4/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Talking about Type-C for a moment; I can't remember if it was Sony or Ampex (or both?), but they had a separate "sync" head on the scanner. I'm assuming that was to have a clean sync pulse on the head switch? A problem obviated by a TBC?</div><div><br></div><div>Scott Thomas</div><br><div><div>On Feb 6, 2010, at 5:20 PM, Don Norwood wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div bgcolor="#ffffff" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Hi Park:</div><div> </div><div>All of the Type-A 1" machines up thru the VR-7800 had the switch above the vertical interval. The VPR-7900 was the first to place it in the vertical. Remember also that the Type-A machines are single head, so there is more than a "switch", there is a dropout for several lines. The VR-660 is a 2-head design so there is a switch and no dropout.</div><div> </div><div>When Sony made their first 1/2" machines, there was apparently some "reverse engineering" done on their Ampex predecessors. Although the Sony machines were 2-head, they had a "blanking" circuit that covered up the switching point and produced a totally blank area in the same location as the Ampex Type-A. There was no logical reason for that other than replicating the output signal of the Ampex. The practice was discontinued in subsequent models.</div><div> </div><div>Don Norwood<br><a href="http://www.digitrakcom.com">www.digitrakcom.com</a> </div></div></span></blockquote></div></body></html>