[QuadList] TBC

[Bill Carpenter]

Hi Don & Everyone,

I spec'ed that unit in early 71, and entered into a  contract with Andersen to build it, on which they delivered a prototype in late 71, may be Nov, and then the fun started. It did not work, got rejected, contract into default, litigation began, gave depsitions, recommended how much for our president to pay them to " Go Away", end of Andersen File.

I had the "mini-buffer" TBC-790 available, before the Legal case was started.

Bye for now, Bill & Gewyn & Ginger (whoof...whoof)

--- On Mon, 5/2/11, Don Norwood <dwnorwood at embarqmail.com> wrote:

From: Don Norwood <dwnorwood at embarqmail.com>
Subject: Re: [QuadList] TBC
To: "Quad List" <quadlist at quadvideotapegroup.com>
Date: Monday, May 2, 2011, 8:30 AM

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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