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[Don Norwood]

----- Original Message ----- 

> The trade was done for the technologies that made quad work.  RCA and 
> Ampex
> did a trade that I believe was documented somewhere in an interview with
> Charles Ginsberg.  I will try to find that.  There were numerous  people 
> and firms
> involved with the development over the years.  3M did the  dropout
> compensators for machines.  Someone else invented the variable  delay line 
> time base
> corrector that was then licensed to Ampex.  I remember  a sticker on the 
> unit.
> Was it a gentleman at WBBM?  Anyone  know?  I did see a tube type AMTEC 
> that
> was the old NET facility in  Ann Arbor, MI.  They had a contact duplicator 
> for
> quad.  Unfortunately  the place caught fire and was destroyed.
>
> Chris Hill

The exchange was for RCA's color technology and you're correct, it is 
documented in one of Ginsberg's articles.

3M did make accessory dropout compensators, but I think that Ampex and RCA 
offered their versions prior to 3M entering the market.

Yes, the Amtec inventor was Charles Colson of WBBM.

Don