A dynamically-changing, slightly "phasey" sound as a note or chord decays, which is common to some tube amps. Typically, "swirl" is caused by a midrange "dip" or varying duty-cycle change in a ...
a grid in a pentode vacuum tube that is used to minimize secondary emission from the plate, by virtue of it's negative charge, which repels electrons emitted and returns them back to the plate. It ...
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