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Tape groups
Blank tapes are divided into four groups depending on the type
of coating and its recording characteristics. These vary
considerably between brands; those given here are a rough
guide.
Group 1 (ferric types with 120 ps equalisation) This is the
most common type being also the variety used in the
manufacture of musicassettes. There are three basic grades.
Lowest is the type variously designated 'standard', 'dynamic',
'ferric' and 'low-noise' They have the lowest remanence and
signal/noise ratio, but improvements in every grade has
brought these up to the standard of high-grade tapes of a few
years ago. The best are capable o