it may be made with tape recording head as anode load.
A capacitor is parallel to make the resonant circuit.
Adjustable feedback to grid can be made by another tape recording head physically approached to the other head gap, like two heads approaching to kiss each other.
A high Megohm resistor from Vb or plate to grid to neutralize the negative self assumed bias on grid. So the electron tube may be operated at even 6V.
Whether heater voltage needs to be reduced, it has to be found out too.
Instead of heads a single toroidal Magnetec Nanoperm core can be used, all windings wound there.
The high grid leak may make the tube to have automatic voltage gain, as the higher the grid is driven the more negative it becomes as it has attracted electrons to its capacitance. So anode current and
Gm decreases This is also happening on a U47 V14 amplifier.
A suitable tube can be EF183 triode connected.
A capacitor is parallel to make the resonant circuit.
Adjustable feedback to grid can be made by another tape recording head physically approached to the other head gap, like two heads approaching to kiss each other.
A high Megohm resistor from Vb or plate to grid to neutralize the negative self assumed bias on grid. So the electron tube may be operated at even 6V.
Whether heater voltage needs to be reduced, it has to be found out too.
Instead of heads a single toroidal Magnetec Nanoperm core can be used, all windings wound there.
The high grid leak may make the tube to have automatic voltage gain, as the higher the grid is driven the more negative it becomes as it has attracted electrons to its capacitance. So anode current and
Gm decreases This is also happening on a U47 V14 amplifier.
A suitable tube can be EF183 triode connected.
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