9/21/2002
40
Audio Magnetic Tapes
Date Type Hc Retentivity Remanence Thickness   WTD S/N Base Film
(Oe)       (G)    (nWb/m)     (mils) (dB)
1948 Scotch 112 170       450       715       .70 Acetate
 
1948 Scotch 111 270       920      1015       .44 0 dB Acetate
 
1962 Scotch 202 315       790      1015       .51 5 dB Polyester
 
1969 Scotch 206 320      1050      1430       .54 5+3 Back coated polyester
 
1974 Scotch 250 380      1200      1985       .65 Back coated polyester
 
1979 Scotch 226 370      1400      1985       .56 5+5.8 Back coated polyester
 
1971 Ampex 406 290      1150         .50 Back coated polyester
 
1974 Ampex 456 295      1400           .50 Back coated polyester
 
1990 Scotch 996 360      1700       2700       .63 5+8.5 Back coated polyester
 
Quantegy GP9 350      1500             .69 Back coated polyester