On Sun, 12 Feb 2017 23:35:04 +0200, Iain Churches wrote:

"Jim Lesurf" wrote in message
...
In article , Iain Churches
wrote:
Prerecorded cassettes were always something of a compromise
(high-speed loop-bin duplication) but towards the end of that era,
chrome tape with Dolby B was starting to sound pretty good.

That reminds me that there was at least one company who did 'real time'
Cassette duplications for the sake of sound quality. I can't now recall
their name(s), though. Something like "White(something" perhaps was one
of them.

There were probably many. One I know of in North London was called
"SuperCassette" (original, eh?) They had a large room with dexion
shelves floor to ceiling with two or three realtime high-end cassette
recorders (Nakamichi or something similar) on each shelf. Each "aisle"
was fed by its own "master recorder" (Revox A77) with a studio copy of
the master running at 15 ips. The cassettes sounded quite good!


I wonder, seeing as they were going to such an extreme, whether they
also ran the master and slaves in reverse to mitigate the phase delay
'distortion' effect on low frequency square wave test signals which made
such test signals look like triangle waves on playback when viewed on an
oscilloscope, or did they just accept that despite this very visible
departure from the original waveshape, no one could distinguish the
direct versus the phase distorted magnetic recording playback by ear
alone anyway? :-)

--
Johnny B Good