1988 Yamaha KX-500: you can adjust the bias and the sound with the play-trim control. It has only 2 heads, but the main head is a fantastic amorphous one. Mechanically the deck
Yamaha KX-R430 Single Stereo Cassette Deck Player Recorder (AS IS)
Yamaha K-960 Stereo Cassette Deck with DBX (1981) - YouTube