The ET2 is a remote-controlled vacuum-tube preamplifier designed to serve as
the control center for high-performance audio and audio/video systems. The ET2
features a sophisticated level control circuit designed to allow precisely
repeatable level and balance settings with adjustments made in .5db increments.
With seven inputs, the ET2 will accommodate elaborate audio systems. The ET2
includes a Theater Loop which provides a locked unity gain setting, making it
the ideal component for listeners who’ve been wanting to integrate home theater
into their stereos without compromising the performance of their primary music
system.
The ET2 zero-feedback line-stage circuit consists of a single-ended triode
amplifier using a high current vacuum tube. A direct coupled buffer stage
provides a low output impedance to insure that the ET2 can comfortably drive
virtually any combination of interconnect cable and power amplifier. This
circuit’s simplicity pays dividends in tonal integrity and seductive musicality
while offering flexibility in system matching.
The ET2 is optionally available with a choice of two built-in phono
equalization preamplifier stages (a high gain stage and a low gain stage) to
provide the additional gain and RIAA equalization that phono cartridges require.
The phono circuit uses two triode amplifier stages for voltage gain. A passive
network of precision components accurately provides the required frequency
compensation. A direct coupled buffer stage isolates the stage from external
cables and components connected to the EPL and theater outputs. The circuit
employs no negative feedback loop, eliminating feedback induced timing errors
that compromise dynamics and imaging. The high gain phono stage is suited for
use with low to medium output moving coil cartridges with rated output of 1.0 mV
or less. The low gain stage is recommended for cartridges with output above 1.0
mV.
