[QuadList] TBC

[Don Norwood]

Hi Tim:

I suspect you are right about that!  In the 70's, we had one of the first 
Microtime analog TBC's which I gave away many years ago, but I still have a 
manual for it.  We used it with H-locked VPR-7900's and it worked well in 
that application. It was fed by a switcher so that it could be used with 
either of two 7900's, and you could "hot switch" between the two machines if 
needed.

It worked with either heterodyne or direct color, but we never used the 
heterodyne mode which was a 2-step process.  In order to get a fully locked 
signal from 1/2" or 3/4" tape, you first played the helical tape through the 
TBC and recorded it on a machine that could H-Lock on playback.  Then you 
took the demod out of that machine, and played back the H-locked dub through 
the TBC and got coherent output....at least that's what the manual says!

We only used it with the 1" direct color machines and I don't think I ever 
tried it with a quad, but the manual outlines that process.  With an 8.8 
microsecond window, it was basically an Amtec/Colortec on steroids, same 
correction approach, just 8x the delay line.

Don Norwood
Digitrak Communications, Inc.
www.digitrakcom.com

----- Original Message ----- 
From: "Tim Stoffel" <tim at lionlamb.us>
To: "Quad List" <quadlist at quadvideotapegroup.com>
Sent: Sunday, May 01, 2011 11:54 PM
Subject: Re: [QuadList] TBC


> On Sat, 2011-04-30 at 11:56 -0400, rabruner at aol.com wrote:
>> At one time I had a Microtime analog TBC, based on switched delay
>> lines, that was supposed to handle Quad video. It had a meter on the
>> front panel.  It was a gargantuan beast, about six or seven rack
>> units. Not sure of the model number, but it was a predecessor of the
>> all solid state units. I never tried hooking it to a quad to check out
>> that function.  It was squirrely and glitchy by the time I encountered
>> it.
>>
>
> Did this device say 'Television Microtime' on the front, and perhaps
> have a big Greek capital delta on the front?
>
> Tim Stoffel
>
>
>
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