[QuadList] TBC

[george keller]

CVS had a DTBC it had either a 16 or 20 in it's model number which had an optional extra wired in small board mod for segmented machines.  There may still be some around, but look for the board.  AF put one in a 1200 D or E(?) and made it smaller than an AVR 2, you could roll it around anywhere.

I have also played wilth DTBC's and the 2000 also with no real luck.  Widening out the supression pulse and moving it around showed some noticable results, but no cigar.  Might not have too bad in mono, but never tried it.

 George Keller





-----Original Message-----
From: Don Norwood <dwnorwood at embarqmail.com>
To: Quad List <quadlist at quadvideotapegroup.com>
Sent: Fri, Apr 29, 2011 5:53 pm
Subject: Re: [QuadList] TBC


Shai:
The design is very different.  I have tried many different models, not 
xpecting them to work, but just out of curiosity.  NONE of them, from 
lder, early generation TBC's to very modern designs will work.  There are 
wo main problems.....first is the different nature of the timing error 
etween segmented and helical, and second is that many of the early designs 
s well as later and less expensive models were not designed for use with 
irect color recovery.  They rely on the heterodyne processing in the VTR to 
ecover the color signal, and that's the market that most of the TBC's were 
esigned for.
Merlin used several different models of NEC TBC's but I believe most of them 
equired some degree of modification.  They also used an Adda VW-2 and an 
mpex TBC-800, both with some mods .  You can find info on these on our 
ebsite on the Merlin Literature page.
Don Norwood
igitrak Communications, Inc.
ww.digitrakcom.com
----- Original Message ----- 
rom: "Shai Drori" <srdbx at netvision.net.il>
o: <quadlist at quadvideotapegroup.com>
ent: Friday, April 29, 2011 11:32 AM
ubject: Re: [QuadList] TBC

 Why is that? I thought that maybe an old TBC might be able to handle this? 
 Has anyone tried this before? Also, what do I do with LB on an AVR-2? Ken 
 Zin looks very busy at the moment I doubt he'll have time for me now to 
 talk about his cards. Is the avr-1 and tr-70 the only multistandard 
 machines?
 Shai

 On 29/04/2011 11:00, quadlist-request at quadvideotapegroup.com wrote:
> The problem is that the TBC must be designed for segmented scan.  VERY 
> FEW
> ever were, and I'm not aware that any on the market today or in recent 
> years
> will work for anything other than non-segmented (helical) scan.
>

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