TDK D

Magnetic Particle: Grained Ferric

Coercivity: 380 Oe
Remanence: 1450 Gauss
Squareness Ratio: 0.81

Operating Bias: -0.5dB
MOL 315Hz: +3.0dB
MOL 10kHz: -8.0dB
Sensitivity at 315Hz: -0.5dB
Sensitivity at 3.15kHz: -0.5dB
Sensitivity at 10kHz: -0.3dB
Sensitivity at 16kHz: -0.0dB
Bias Noise: -55.0dB

TDK D was a "work-horse" type I cassette. It was a basic type I that evolved from TDK LN and appreared first around 1972. Even as a basic tape it still offers reasonable performance. It was available in a variety of lenghts ranging from 30 to 180. In Japan starting from 1987 TDK D was sold under TDK AE name.