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6
SECTION ONE
Evolution 222 Features and Technology
This section describes the innovative features and technology of the Evolution 222
preamplifier, and defines CAST and other key terms used in this reference.
Features
The Evolution 222 has an open loop bandwidth that exceeds 1 MHz and a
balanced Krell Current Mode design, terminating in Evolution CAST ™. CAST
inputs and outputs drive a newly designed current mode balanced input stage.
Class A, balanced circuitry is used throughout the preamplifier. Cascoded, current
mirror input and output stages utilize an LED voltage reference to achieve an
exceptionally linear state of operation. There are 310 transistors utilized in each
channel, and all are Class A biased. A robust power supply is on board for excep-
tional audio performance.