[QuadList] TCR 100 Logic

[georgenann at aol.com]

The Germans had some neat WWII radios, they liked to use only 1 type of tube for everything, RF,IF,AUDIO, etc. Only needed 1 spare type of tube, and it worked.

George Keller







-----Original Message-----
From: Trevor Brown <videovault at sky.com>
To: quadlist at quadvideotapegroup.com
Sent: Wed, Feb 3, 2010 5:26 am
Subject: [QuadList] TCR 100 Logic



The capstan up/down motors in the ACR's are Chrysler window up/down motors.  I don't remember the model or year.
 
Sort of related (in a car parts sort of way…not in a Quad way), Bosch telecine’s used the same lights as Volkswagons for the front panels…and you could probably buy the parts from an auto parts dealer for a 10th the price of the manufacturer.
 
John Walko
 
Bosch were famous for this if they once put a unit together all their products used the same part, one of the field engineers tells the story of a Capstan motor going down in a remote part of Africa on a BCN51 and he bought a Bosch lawnmower in a garden shop which used the same motor, so he fitted it and it worked. I did wonder how he knew which model Lawnmower to buy, but I guess as he worked for Bosch……
 
The circuits were the same, if they designed a synch separator, then every time you came to a sync separator it was the same design same print layout, does not matter if it was a VT, Telecine, or Camera,
They never re-invented the wheel
 
 
They also made a cart machine BCN 100 three one inch decks so fairly boring
 
The TC100 was a multi stage mechanical thread with bike chains and a pinch roller less, wrap around capstan, each stage signaled its completion to a DTL logic system by micro switches.
 
The DTL logic was arranged on 200 PCB’s 5 chips per PCB and about 5 gates per chip   DTL uses wired OR gates so you can interconnect several gate outputs and if anyone goes low it will pull the others low
Ie OR function. This is hard to troubleshoot if you have an erroneous low as you cannot identify which gate is faulty.  The Or gates spanned several PCB’s just to add to the challenge 
 
 
TrevorB
UK Member
 


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