"Dave Plowman (News)" wrote in message
...
In article ,
David Looser wrote:

Dolby licensing prohibited the use of Dolby B on 15 and 30 ips tapes.
The "high-speed" (3.75, 7.5 and 15 ips) version of the series 75
Ferrograph with Dolby B was required to disable the Dolby circuitry
when 15 ips was selected. And I agree the main reason for using 30 ips
was to avoid using NR at all.

One learns something knew every day - thanks for that. I've never owned a
Dolby B 1/4" machine -

There weren't many. Revox did a Dolby B version of the A77, but that was a
two speed (3.75, 7.5 ips) machine. There was no high speed (7.5, 15 ips)
version with Dolby B. The Ferrograph was the only 15 ips capable machine
with Dolby B that I'm aware of.

only cassettes.

There's little doubt that it was cassettes that made Dolby B a money-spinner
for Dolby.

But I do have a Dolby A/SR rack for
my machines.

I have a Dolby A unit, not that I use it much!

SR is brilliant.

My only experience of SR is in connection with 35mm film (analogue sound
tracks on 35mm cinema release prints have used SR noise reduction for some
20 years or so)

It's amazing what some firms chuck out. ;-)

As you say, some of the things that used to get slung in the skip at BT labs
when I worked there made me weep.


David.