Please note. I do not have the original box for this preamp. The preamp will be packed carefully, however. Check my feedback. I have sold and sent other pieces without the original packaging and all arrived safely. Local pickup at my business address in NJ is welcome.
VACUUM TUBE DESIGN. All signal amplification is accomplished using vacuum tubes.
RECORDER LOOP. A tape recorder loop is provided for any recording system.
ELECTROMAGNETIC SWITCHING. Digital logic integrated circuits drive silent electromagnetic
switches for the most reliable, lowest distortion signal switching available.
EIGHT PROGRAMABLE SOURCE SELECTIONS. All eight selections accommodate unbalanced
program sources; four also accommodate balanced sources. Standard sources may be
reassigned to any of four alternate sources or be turned off completely.
BLUE VACUUM FLORESCENT DISPLAY. The 12-character display matches other McIntosh
equipment. It displays input selections, volume level and menu selections during setup.
DIGITALLY CONTROLLED ATTENUATOR. The C2200 attenuator provides 214 steps of 0.5dB
each. The step match between sections is typically less than + 0.1dB, more accurate than is
possible using mechanical potentiometers. Attenuation changes occur at the zero crossings of
the audio signal so that no artifacts are audible as you adjust volume.
POST ATTENUATOR. A post attenuator stage, interlaced with the main attenuator, abruptly
reduces output amplifier gain to unity. The result is an immediate drop in the noise floor, to
better than -95dB. Noise is virtually eliminated.
VRV (VARIABLE RATE VOLUME). The volume vs. rotation rate varies as preamplifier gain
varies thanks to control microprocessor software. Though the resulting volume change vs. rotation
is the same as mechanical attenuators, the 0.5dB resolution and tracking are far superior.
ILLUMINATED OUTPUT METERS. Left and right blue illuminated meters monitor output level
over a 70dB range.
DOUBLE SHIELDED POWER TRANSFORMER. Copper and steel shielding eliminate hum
radiation from the power transformer.
SWITCHED AUDIO OUTPUTS. These are provided for additional amplifiers in remote areas
or to build multi-amp systems.