It is the earliest oscillator circuit, invented by US engineer Edwin Armstrong in 1912 and independently by Austrian engineer Alexander Meissner in 1913, and was used in the first vacuum tube magnetically coupled into the tank inductor in the input circuit by a " tickler coil " " ( L2, right ) " in the output circuit.
Meaning
a small coil in series with the anode of a vacuum tube and coupled to the grid to provide feedback
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