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How would a cassette or reel to reel tape sound directly driven by an ECC82?

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

What if...

Instead of tweaking electronics in order to achieve flat frequency response from magnetic tape, reel to reel, cassette etc...


Increasing the tape speed until it is almost ready.


One cannot expect a cassette to shine on recording live drums for example. So much HF emphasis while recording or reproducing puts a great strain to amplifiers. Of course if first the recording is done on reel to reel high speed and then re recording to cassette the result should be better because of objective dynamic processing without subjective artifacts. Ie fitting something big (great live music dynamic range) to something small (the medium). See also [Hamm]. Digital original recording cannot do this.


But this is not a fault of the tape inside the cassette. It is the speed that is too low for such an amplication.


Would it be fun to have C60 cassettes running so fast, eg 7.5ips that they last 7.5 minutes per side? And if full track stereo is in order, just 7.5 minutes. Plenty for recording a song at possibly pristine quality.


Having said that 1/4in tape full track track stereo reel to reel at 7.5ips or higher can be even better.


Reference on amplifiers:
(Electron) tubes vs transistors (vs op amps), Is there an audible difference? - Russel O. Hamm - JAES

3 electron tubes from mic to recording head battery schematic

At your risk. Take all necessary safety precautions to protect everyone and everything involved.


This is it:
https://www.radiomuseum.org/tubes/tube_df650.html


It looks so similar to hearing aid, mic amp and so many other world class electron tube circuits that initially it was thought it is a hearing aid circuit.


https://www.radiomuseum.org/tubes/tube_df651.html


How would it sound driving with speed reel to reel or cassettes recording heads?

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