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From: Patent Tactics, George Brock-Nannestad Hi Mike, obviously you are right, ½ inch master!s Lyrec also made equipment for 1" masters. The old Lyrec website has been frozen as a time capsule and is available at: http://klopetiklop.dk/Lyrec/about.htm Kind regards, George --------------------------------------------- > On 1/13/2011 8:51 PM, George Brock-Nannestad wrote: > > From: Patent Tactics, George Brock-Nannestad > > > > > > Hello Michael [Shoshani], > > > > you never understood high speed commercial dubbing. Well, it was a high > speed > > reproduction of the master 1/4 inch tape and dubbing it onto high speed > > recording cassette tape, > > The duplicators I saw here in the U.S. often used a 1/2 inch master > because it was four track -- both sets of stereo tracks were recorded at > the same time. The master was in a bin-loop which played over and over > and over and over. > > collecting the recorded cassette tape in a cassette, > > putting in an empty cassette and recycling the master. The cassette tape > came > > from a pancake and was cut. > > They usually recorded the entire pancake from the continually repeating > bin-loop master. The recorded pancake was placed on the cassette > loading machine, and a cue tone told the machine where to cut. The fun > part is watching the automatic splicing block splice the tape onto the > middle of the C-0's leader. Then the tape is wound into the cassette > until the tone stops it, and then the automatic splicer tacks the other > half of the leader onto the tape and is wound back into the cassette and > it drops down a chute to the pile of cassettes. I videotaped one of > these machines and ought to put it on YouTube -- but I bet there already > is one. > > > > It was very quick, but there was no loss of high > > frequencies, because that is all dependent on the gap length, and that > stayed > > the same. It was a fully automated process, and LYREC of Denmark made > very > > good duplicating equipment. The electronic difficulty was in the bias > > frequency, which was in the Megahertz range, and you had to be very > careful > > with your stray capacities. > > > The interconnect cables were video cables because the frequencies were > up in the video range. > > > Mechanically it was a challenge, but LYREC did > > solve that. LYREC machines are still in operation, I think, and their > last > > markets were in India and Russia. Kind regards, George > > I think there still might be some going here in the U.S. > > > Mike Biel [log in to unmask] > > --------------------------------------- > > > > > >> On Thu, 2011-01-13 at 19:21 -0500, Tom Fine wrote: > >> > >>> But, none of this warm and fuzzy nostalgia will make those piece of > >> garbage pre-duped tapes sold to > >>> the Walkman Generation sound any better. They were disposable junk, > and > >> almost all of them ended up > >>> in landfills in the 90's, replaced by much better sounding CD's. I > never > >> fell for the trap since I > >>> could dub my own tapes. > >> Same here. I never understood how high speed commercial dubbing worked > >> in the first place; it seems that all the high frequencies would be > well > >> out of the reproduction and recording range of the equipment involved. > >> I made my own LP to cassette dubs, carefully setting the recording > level > >> to kick just below -0 db on the loudest passages so as not to ride gain > >> constantly. > >> > >> My children will never know such geeky joys. :) > >> > >> Michael Shoshani > >> Chicago > >