[QuadList] TBC

[Trevor Brown]

The TR70a was two fm demods switch picture in sync and sync in picture
The 70c was front porch switched
If you get a short front porch on an archive tape you will wish the 70C far
enough
The TR 70A will play it 

Trevor Brown
videovault at sky.com   

-----Original Message-----
From: quadlist-bounces at quadvideotapegroup.com
[mailto:quadlist-bounces at quadvideotapegroup.com] On Behalf Of Don Norwood
Sent: 08 December 2009 16:29
To: Quad List
Subject: Re: [QuadList] TBC

Hello Guy:

I'd like to know how that works too.  I never tried a Zeus in my quad 
experiments.  And another entertaining YouTube video too....!!!

Don

----- Original Message ----- 
From: "Guy Spiller" <quadruplex at verizon.net>
To: "Quad List" <quadlist at quadvideotapegroup.com>
Sent: Tuesday, December 08, 2009 10:20 AM
Subject: Re: [QuadList] TBC


>I have thought about coming out of the RCA mono ATC into an external TBC 
>for several years, as I had felt that the color ATC was probably the 
>weakest part of the system as far as video performance....at least in my 
>TR-70A.
> Since I now have these 70Cs up and running to compare, I have noticed 
> quite an improvement in the performance of the entire playback system 
> relative to the 70A.  It's a fair comparison as all of them have the RCA 
> equivalent of Ampex's Vel Comp and AutoChroma....CAVEC.
> I still have some curiosity about what an Ampex Zeus TBC would do fed with

> the output of the mono ATC....so easy to do, that I'm somewhat embarrassed

> that I haven't done it yet.  This discussion just may get me motivated to 
> try it.
> Maybe another YouTube video might be in order....
> Guy
>
> Chill315 at aol.com wrote:
>> The RCA machine did use the servo to keep the video in the center of the 
>> TBC window.  Ampex did it a different way.  Thus I always found the Ampex

>> method easier to keep running.  The feed back loops in the RCA had you 
>> scratching your head every now and then.
>>
>> Chris Hill
>> WA8IGN
>> ------------------------------------------------------------------------
>>
>> _______________________________________________
>>
>
> -- 
> Guy Spiller
> email: quadruplex at verizon.net
> phone: (804) 379-2050
> website: www.GuySpiller.com
> Midlothian, VA
>
>
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