[QuadList] Little more fun

Tue Mar 9 16:35:22 CST 2010

Tnx fer info steve.  I wish I was in on that system, sounds interesting.

73,

George

-----Original Message-----
From: Walton, Steve <SWalton at tribune.com>
To: Quad List <quadlist at quadvideotapegroup.com>
Sent: Tue, Mar 9, 2010 5:28 pm
Subject: Re: [QuadList] Little more fun

Hi,

By placing the two tapes together in a magnetic field, some of the magnetic image from the master would be transfered to the blank tape (similar to a print-through).  It left just enough of a magnetic signal on the blank tape to be recoverable by some machines.

Obviously there was a limit to how many copies could be made this way, but I do not know what that limit was.  One would think that every time this process was repeated, the image on the master would diminish slightly.

Steve Walton

From: quadlist-bounces at quadvideotapegroup.com [mailto:quadlist-bounces at quadvideotapegroup.com] On Behalf Of georgenann at aol.com
Sent: Tuesday, March 09, 2010 5:19 PM
To: quadlist at quadvideotapegroup.com
Subject: Re: [QuadList] Little more fun

Hi Steve,

Thanks for the reply about the HS Dubber.  The part I don't quite understand is the RF field, what kind of field was it?  How did it pass the mag info to the blank tape?  Also did it damage the original mirrored master?  I ran into a fellow who worked on one and he told me he had lots of trouble with it, it was a "Bear".

73,

George Keller

-----Original Message-----
From: Walton, Steve <SWalton at tribune.com>
To: Quad List <quadlist at quadvideotapegroup.com>
Sent: Tue, Mar 9, 2010 5:11 pm
Subject: Re: [QuadList] Little more fun

Hi,

It was my understanding at the time (70's) that the "high speed dubs" were first recorded on a special "master" machine (AVR-1?) that was specially manufactured to record a mirror image onto the master tape.  This special machine was identical in all respects to a standard machine, except that it was a mechanical mirror (head rotated backwards, tape ran backwards, I am not sure).  But the net result was that it recorded a tape that was a mirror image of a normal recording.

This mirrored master tape was then copied as stated below by bringing the master and a blank tape into contact and passing them through a magnetic field.

These high speed dubs were easy to spot because they had a very low RF level.  Some machines (VR-2000's) would not play them, but an AVR-1 would usually get them to play without problem.

Steve Walton

From: quadlist-bounces at quadvideotapegroup.com [mailto:quadlist-bounces at quadvideotapegroup.com] On Behalf Of georgenann at aol.com
Sent: Tuesday, March 09, 2010 4:45 PM
To: garyada at ix.netcom.com; quadlist at quadvideotapegroup.com
Subject: Re: [QuadList] Little more fun

Hi Gary,

Actualy, I think if you had the oxide side of the tape on the heads, the heads would be completely slanted in the opposite angle from the recorded tracks.  With the back of the tape on the heads, we didn't get enough signal to make any video at all.

You just rang another bell.  Has anyone run into the Ampex High Speed Dubber?? I only saw one once at EUE in New York, briefly.  I understand an AVR-1 was needed to make a mirror image tape first, then the dubs were made by putting the new mirror tape against the blank and some kind of field was shot thru them and the video was recorded on it.

George Keller

-----Original Message-----
From: Gary Adams <adam7889 at bellsouth.net>
To: 'Quad List' <quadlist at quadvideotapegroup.com>
Sent: Tue, Mar 9, 2010 4:32 pm
Subject: Re: [QuadList] Little more fun

Because the quad tracks were mostly (not completely) perpendicular to the tape, backwards got some picture upside down and backwards.  You were still reading the oxide side.  This put the control track where the audio heads expected audio so you hear control track.  Capstan would free run without control track.  Some clever people put 240hz tone on the audio track allowing the capstan to be a bit more stable as a joke.  I think newer machines did not like this too much but I’ll bet the AVR1 could play it and probably turn the picture back up  J  (just kidding).   I think on a 1” the tracks would never line up since they were so slanted to the tape.  So the heads would read across the track rather than with the track.  

Gary

From: quadlist-bounces at quadvideotapegroup.com [mailto:quadlist-bounces at quadvideotapegroup.com] On Behalf Of georgenann at aol.com
Sent: Tuesday, March 09, 2010 4:04 PM
To: quadlist at quadvideotapegroup.com
Subject: Re: [QuadList] Little more fun

Hi Joe,

This was after FF to the TU reel then puting it on the supply side so it is looking at the back of the tape, we were getting a "Nil heard signal" from the tape.

Now that you mention it I do remember at some time having a tape upside down on a machine, it did come out upsidedown, but bad picture and lock up with a funny tone from the CTL coming out of the audio. BUt this was with the oxide side facing the tape.

Mny Tnx,

George 

-----Original Message-----
From: Joe Owens <jpo at prestodigital.ca>
To: Quad List <quadlist at quadvideotapegroup.com>
Sent: Mon, Mar 8, 2010 5:18 pm
Subject: Re: [QuadList] Little more fun

[Flipping the tape over takeup/supply] On some machines, the video would play upside down and in reverse, but no audio, obviously.

On 6-Mar-10, at 11:49 AM, georgenann at aol.com wrote:

I think this would work on the 1" machines also, but I never tried it.

Joe Owens

Presto!Digital Colourgrade

302-9664 106 Avenue

Edmonton, Alberta T5H0N4

+1 780 421-9980

jpo at prestodigital.ca

= 

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