Dolby NR encoding - did it ever work

The issue with dolby when used for live dead recordings is that all Sony D 5's engaged a brick wall multiplex filter when dolby was engaged. This cut off all frequencies above 14,000 hz. It wasn't a problem with dolby but rather a problem with the D5, which was the deck used for 95% of all in field use for Dead recordings.

I too was a Deadhead taper from years back, circa 1982-1995.

I stand corrected. Early on I didn't use the units dolby but rather used metal tapes and saturated the tape for low noise. Later I used Dolby because it worked for me. It was in an article where I read the multiplex issue........around 1989 or so....by that time I had gone digital.

BTW Dolby SR is state of the Art and approaches digital for S/N ratio.