[QuadList] Blanking Issues

[Trevor Brown]

Thanks Bill

The AVR 3 was expensive and C was here so not many around as a result I
never got to play

 with one.  

 

C format was OK but it lacked the soul of quad, although ........

 

We have a radio programmed over here called desert Island Discs, where
celebrities get to select their favorite records 

When they do that for C format VT machines mine will be the VPR5 again heavy
but stunning engineering.

 

I hate to imagine what they cost new

Again not many around

 

Trevor

UK Member

 

 

 

 

From: quadlist-bounces at quadvideotapegroup.com
[mailto:quadlist-bounces at quadvideotapegroup.com] On Behalf Of Bill Carpenter
Sent: 07 February 2010 20:57
To: Quad List
Subject: Re: [QuadList] Blanking Issues

 

Yes, Park,

Everything that has been stated before, by everyone is correct, the "C"
format was based on the moving head technology, which changed the dropout
position as a result of the greater interchange stability of the format. We
added the "sync" head as an option, to make our machine the same as Sony. 
I was not part of the "C" format related effort, since I had be given the
AVR-3, the last quad, and the largest retrofit program in Ampex's history.
It was developed to be a great machine, but had a product manager who didn't
understand engineering and was also more interested in the editing system we
were working with a Canadian Company, Central Dynamics Limited.
My first "C" format product was the VPR-20, with was the VPR-10, which did
not get to market, revised to "C" format. It was a very good, but heavy
"porterable"( my word, which meant, give somebody $5-$10 and let them carry
the 50lb unit)

Bill Carpenter

 

  _____  

From: C. Park Seward <park at videopark.com>
To: Quad List <quadlist at quadvideotapegroup.com>
Sent: Sun, February 7, 2010 9:02:24 AM
Subject: Re: [QuadList] Blanking Issues

Yes, that is the way I remember. Sony insisted on recording the entire
video. My Ampex machines did not have the sync head and I never missed it.

 

Bill Carpenter may shed more light.


Best,

Park

 

C. Park Seward

Visit us: http://www.videopark.com









 

On Feb 7, 2010, at 7:50 AM, Wayne Watson wrote:





It was in the SMPTE standard. Ampex made it an option and Sony made it
standard. The concern was that something in the future might need the V.I.
However in type C only lines 4 to 14 were missing so VITC and VITS were
still there. I think there was also an issue where Sony did not want tp pay
re a patent Ampex had on control track update (or something like that)and
needed the V.I. to do it their way. Can anyone shed more light on that?

  _____  

From: quadlist-bounces at quadvideotapegroup.com
[quadlist-bounces at quadvideotapegroup.com] On Behalf Of Scott Thomas
[scottgfx at mac.com]
Sent: Saturday, February 06, 2010 11:59 PM
To: Quad List
Subject: [QuadList] Blanking Issues

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?

 

Scott Thomas

 

On Feb 6, 2010, at 5:20 PM, Don Norwood wrote:





Hi Park:

 

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.

 

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.

 

Don Norwood
www.digitrakcom.com  

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