OSCILLATION TRANSFORMER.--See Transformer.
OSCILLATION VALVE.--See Vacuum Tube.
OSCILLATOR TUBE.--A vacuum tube which is used to produce electric oscillations.
OVER MODULATION.--See Blub Blub.
PANCAKE OSCILLATION TRANSFORMER.--Disk-shaped coils that are used for receiving tuning inductances.
PERMEABILITY, MAGNETIC.--The degree to which a substance can be magnetized. Iron has a greater magnetic permeability than air.
PHASE.--A characteristic aspect or appearance that takes place at the same point or part of a cycle.
PICK-UP CIRCUITS.--See Circuits, Stand-by.
PLATE CIRCUIT REACTOR.--See Reactor, Plate Circuit.
PLATE CURRENT.--See Current, Plate.