Connecting the recording head directly to anode, drain, collector Ie DC bias

At your risk All safety precautions should be exercised.


Biasing for a magnetic material is very similar to biasing a transistor or electron tube for example.


We need to shift the operating point to the linear portion of the transfer characteristic.


DC bias can be employed on tape recording [Heelyer]. But it uses only the positive part of the magnetization curve. And it will also produce increased noise [Hellyer].


Nevertheless a DC signal has an infinite bandwidth. See Fourier transforms.


And it should be simple to try.


How would a recording sound like for example on a cassete running at FF speed? Minimum EQ if any should be used on playback. Just a full low pass filter at 6dB per octave on reproduction? The high driving impedance of active devices would produce constant current drive wrt frequency of the recording head which is what is normally used on tape recording.


Reference:


Tape Recorders - Hellyer