[QuadList] Changes in Post over the years (wasElectronic Editing Notes)

[dcfwtx at aol.com]

Bill,


That would confirm the finding I have on several 7800 scanners in my possession, that have the flying erase heads.


Thank you.


David Crosthwait
DC Video
www.dcvideo.com





-----Original Message-----
From: Bill Carpenter <wcarpen107 at yahoo.com>
To: Quad List <quadlist at quadvideotapegroup.com>
Sent: Sat, Jan 30, 2010 1:42 pm
Subject: Re: [QuadList] Changes in Post over the years (wasElectronic Editing Notes)



Don,

The flying erase head was added before the 7900, because I worked on the design on the 7800 and then tested it, and made good color edits. The circuity to drive the erase head was placed under the top transport trim, just  to the left of the scanner, between it and the supply reel. I remember changing the rotary transformer and get a signal that would turn it on to erase the video at the proper time.
I believe that this was done in late 1978, and we introduced it at NAB 79, in Washington.

Bill




From: Don Norwood <dwnorwood at embarqmail.com>
To: videovault at sky.com; Quad List <quadlist at quadvideotapegroup.com>
Sent: Sat, January 30, 2010 1:02:58 PM
Subject: Re: [QuadList] Changes in Post over the years (wasElectronic Editing Notes)

  
Trevor:
 
The VPR-7900 which followed the 7800 by just a few years added a flying erase head, moved the dropout into the vertical interval, had an H-locked drum servo, and added Very High Band carrier mode which was identical to quad and then later to type-C format.  All of that allowed very high quality video and edits.  So while the 7800 had its limitations, it was a stepping stone in the development of helical during an era when many thought it could not be done.  Thanks to Bill and all who worked on those projects!
 
I still have a couple of 7900's.  Park has seen one of them and I think he would agree that the quality is quite good.  The transport design with the moving guides was the weak link, and that was addressed by the VPR-1.  
 
Don
 
  
----- Original Message ----- 
  
From:   Trevor Brown   
  


  
  
Interesting   Bill 
   
I   never saw anything but Push and Pray on VR 7800
   
Insert   3 second cycle out of edit was a problem for drop ins
   
VR   650 was worse with 7 seconds
   
 
   
Hated   the VR 7800 machine format with its hole in the picture
   
Thought   IVC Alpha wrap was a better idea
   
But   I think it was several years later
   
  



      
 
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