Magnetic Particle: Finavix
    Coercivity: 1130 Oe 
	
    Remanence: 3200 Gauss 
	
    Squareness Ratio: 0.84 
	
    Operating Bias: +0.5dB
	
   	MOL 315Hz: +6.0dB
	
   	MOL 10kHz: 0.0dB
	
   	Sensitivity at 315Hz: +1.0dB
	
   	Sensitivity at 3.15kHz: +1.5dB
	
   	Sensitivity at 10kHz: +2.0dB
	
   	Sensitivity at 16kHz: +2.5dB
	
   	Bias Noise: -58.0dB
	
TDK MA was a "work-horse" of type IV cassettes. The formulation is based on Finavix particle. It appreared first around 1979.
| Japan | US | Europe | |
| 79-81 |   |   | |
| 82-84 |   |   | |
| 84 |  | ||
| 85-86 |  | ||
| 87-89 |  |  |  | 
| 90-91 |  |  |  | 
| 92-95 |  |  |  | 
| 93-94 |  | ||
| 94-97 |  |  | |
| 97-01 |  |  | |
To contact us: TDK(at)vintagecassettes.com