[QuadList] Ampex High Speed

Wed Mar 10 15:28:41 CST 2010

Roger That and Thanks Chris,

I was just thinking there might be a way to get enough energy off the master with a small RF field to get something from the tape.  We have come a long way in the past  50 years or so.  There are a bunch of guys in Silly Valley with 2 and 3 PHD's who should be able to figure something out. Maybe more sensitive tape (I forgot the proper magnetic term).  Has anyone had an X-ray lately with no film?  I wonder how they do that, going right from the media to the doc's computer. I think it is scanned, but what is the media? It is reusable also. Maybe there is something there which can be used in VT.

Has anyone given any thought to the Toyota gas petal mess??  Wonder how they get the petal to tell the computer to increase or decrease speed??  Could they be using something similar to our beloved shuttle controls in VTR's??  If it is similar, and it may be, as it is a good method, if the up / down signal as derived from the two opto couplers 90 degrees apart screws up it could raise hell if you are going 50 mph and take your foot off the gas and now it thinks you are telling it to go faster.  The petal assy. I have seen on TV looks like it may use that system, but if so the "tone wheel" is smaller that the Sony (or my Kenwood's for that matter) and the two optocouplers position may be more critical. If that signal is screwed up in the right way, no matter how many times you hit that petal it could say go faster, as long as you are feeding pulses to it. If that is the case, Toyota is correct when they say "It is not the computer",but it is the external to the computer. I understand Chevy is having the same problem, but it is OK as Obama is guaranteeing them. I have a Chevy PU and a Nissan Xterra, both with sticks. I seem to remember Audi had the same problem years ago.

DE,

George Keller

-----Original Message-----
From: chill315 at aol.com
To: quadlist at quadvideotapegroup.com
Sent: Wed, Mar 10, 2010 3:50 pm
Subject: [QuadList] Ampex High Speed

George

The high speed dubber put the tape through a magnetic field.  The master had to be an extremely high orsted tape.  If youn were to try a regular tape, it would erase the tape.  The physics are that the magnetic field will align the magnetic particles on the low coorcevity tape to be the same as the tape that they are in intimate contact with.  The high orsted tape will low some of its magnetic properties but never be erased.

The high speed dubbers were used to make the VHS copies in a fast time frame.  These were over 10 times real time.  The Ampex unit was a 10 time real time speed.  NET use to do a lot of syndicated shows.  It ws the only way tol make 100 of copies for distribution in a short time.  Their unit had 6 slave stations and could put out in an hour a lot of copies.

Chris Hill
WA8IGN

-----Original Message-----
From: georgenann at aol.com
To: quadlist at quadvideotapegroup.com
Sent: Wed, Mar 10, 2010 11:33 am
Subject: [QuadList] New Subj. - Thanks - Misc. Stuff

Right on Ted,

I really appreciate all the info on the HS Dubber.  I only saw one once, briefly and knew nothing about it's working principles.  CBS never had any.

Also, I didn't realize that the VHS tapes were made in this fashion, I just figured someone had 100 vhs machines which were started with a remote control device.  I am not a movie type so I wouldn't notice if there is much quality difference in the tapes, if any. Besides, the only tapes I ever bought were at great "Discounts" which I bought on 44th ST. in New York after midnight. (HI).

Just rang another bell.  CBS in it's infinite wisdom installed a bunch of DVD recorders, home type in the duplicating area.  You should have heard them yell when I made a copy of one of my Toscanini tape on one of them and when I hit "Stop" and "Finalize" wlith the remote and the other machines stopped.

After that the machine shop made aluminum covers for the front of the machines that had to be removed each time you addressed a particular machine.

This may be a little far fetched, but I wonder if the HS dubber might be an answer to archiving old tapes which might not be otherwise playable.  Dub it as well as can be on the HS dubber, then play it back on an AVR-1 with the revearse heads. Of course getting new 2" tape might be a problem, finding a good HS dubber might be a problem but if there are enough tapes to be done it might be worth a try.  Also you might be able to zap it with a lot of RF without worrying about destroying the original tape to effect a readable transfer.  I'll bet Jim Snyder could whip up such a machine in his spare time.

Also, do I remember hearing Sony had a 2" quad machine?  Anybody have any skinny on that??

How about the IVC 9000??  I saw and played just a bit with Dolphin's machines, they looked pretty good to me, I don't know why everybody didn't go with them, vice Ampex.  I was also impressed with the IVC 8000(?) series helical machines, they seemed solid and were easy to maintain and troubleshoot.  CBS only used them briefly mostly for backup recordings. I ran into them also on some freelance maint work.

Also, if Don from Fla. would get on this group there will be a good deal more gag items, I have been working on him.  A lot of tech stuff too!

One more thing, do any of you former Ampexers have a handle on Cecil Brown?  He was another great guy, Mr. ACR. While I am at it anyone know about another friend, Ray Vincent, Ray lived in Mountainside. He was also a ham.  He came out with the first time/spectrum analyzer.

73,

George Keller

= 

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