[QuadList] Training the Third Generation

Fri Dec 3 14:14:34 CST 2010

RGR THAT,

If the head was not turning, no tape or anything, all you would have to do it poke the head with your finger, it would rotate a bit, then "Settle" and rock a bit in the position where the coil for that phase had the bum transistor. This would give you a clue that you are headed for trouble.  Otherwise the head would lock up, apparently in it's normal fashion and nobody would know the difference, but when the next one goes you have trouble, I think, I never let it go more than one xsistor. I never had a head not start due to this problem, must have had more than one bad transistor. It could have been a "Leaky" xsistor, not putting the full force field on that phase of the head, in which case it is also a good idea to replace the xsistor.

I don't know why this happened, never saw anything from Ampex on it.

Now that I think about it, I don't seem to remember where the MDA was located, I don't think it was on one of the large boards in the main chassis.  I do remember having this problem the night before taping the "Hurricane Carter" fight at Rahway State Prison in NJ and had to go all the way back to CBS to get parts, and perhaps the whole MDA since it was late and we were in the middle of the prison yard and all I wanted to do was to get out of there.

This has shown up many times, but nobody seemed to notice but me.

Another problem which I remember is sometimes signals would not show up on some of the boards due to open "Yellow - I think" small choke coils at the input contacts to the boards.  I had one drive me nuts for a couple days.

I don't think it would take much trainning to learn to operate an AVR-2, it is quite simple.

George Keller

-----Original Message-----
From: Wayne Watson <wayne.watson at sait.ca>
To: Quad List <quadlist at quadvideotapegroup.com>
Sent: Fri, Dec 3, 2010 2:42 pm
Subject: Re: [QuadList] Training the Third Generation

Head MDA
WOW I just had a flashback. When one of the MDA transistors died the head would not start if it was positioned on that phase. Give it a push and away it would go……slow to lock but I think it would play.

Wayne Watson
Broadcast Systems Technology
wayne.watson at sait.ca
(403) 284 7079
SAIT Polytechnic
School of ICT
Room G239E
1301 - 16th Ave. N.W.
Calgary, Alberta T2M 0L4

The SAIT BXST program and WABE need your help to recruit maintenance techs to join our industry. If you want to help please email info at wabe.ca
For information on the SAIT Broadcast Systems Technology Program, check out http://broadcast.sait.ca

From: quadlist-bounces at quadvideotapegroup.com [mailto:quadlist-bounces at quadvideotapegroup.com] On Behalf Of Ted Langdell
Sent: Thursday, December 02, 2010 11:56 PM
To: Quad List
Subject: Re: [QuadList] Training the Third Generation

George,

On Dec 2, 2010, at 7:35 PM, george keller wrote:

Here's my 2 cents.  I would think the 1200's might be the most popular, they are the easiest to fix when they needed fixing.  The AVR-2's worked great when they were working, but to troubleshoot them you had to break out the schematics, scope, etc. and have plenty of room on the floor and no other distractions, like "Air Problems". They also had a minor problem which most people wouldn't even notice till it was too late in the head MDA.  I never liked to have them on remotes.

George Keller

Would you be willing to jot down some of the issues you had with AVR-2's and what your solutions were?

This could be a great help to others to help them get their machines up and running again, or recognize signs of impending problems and act before they become something more than a sign.

Are you interested in doing any maint., maint. training or operator training?

Let me know off-list.  Same request to the list in general.

Thanks,

Ted

Ted Langdell

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