The White 2A Leveling Amplifier is based on a legendary vintage unit that is
entirely tube-based. It.s a totally different device in terms of construction
where all the compression magic happens inside an optically coupled element
formed by a fluorescent panel and some photocells: the famed T4A element.
There is no electronic circuitry involved with the compression itself.
It's just a tube amp with photo-resistors, lighted by a fluorescent panel driven
by the output signal. At the time of this invention, there were not many ways of
making an audio compressor: only variable-mu and optical. Optical was
the simplest one, and if proper elements for both the light emitting panel and
the photocells were matched, magic happened.

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