At your risk. Any voltage can be dangerous. And any current. Also a suitable fuse should always be connected in series with any battery for burn injury or fire hazard safety.
Also a thinner wire than the wire of the head must be used to connect it to anode to avoid blowing the head coil in case of a mistake, malfunction, current runaway etc.
How would a cassette or reel to reel tape sound with anodes directly connected to recording heads?
For example EF183 triode connected. Or ECC82 etc. Cathode to ground. Grid at space potential if not externally shifted in bias. Signal coupled to grid by a capacitor so as not to disturb the electron tube DC wise. Recording head connected to anode. Battery supply after fuse connected to the other sided of head coil. Increasing for example the anode supply until anode current (or DC tape bias) becomes a few hundred microamperes μA. (In fact increasing anode voltage affects grid space potential due to anode electric field penetration, [Deketh]).
See also electron tube anode to recording head Pleiades experiments. See also Pleiades V6 schematic.
Reference:
Fundamentals of Radio Valve Technique - Deketh - Philips Technical Library
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