Millennia M-2B Transformerless Vacuum Tube Stereo Microphone Preamplifier - Manual (Page 3)


M-2b
QUICK START!
READ THIS!! The M-2b operates with lethal operating
voltages -- the voltage inside the M-2b can kill you. Never,
under any circumstances, remove the top cover. Refer to a
qualified electronics technician any and all servicing, tube
replacement, and other operations which require the top
cover to be removed.
Congratulations on your purchase of the Millennia Media M-2b vacuum tube microphone
preamplifier. The M-2b is the result of meticulous listening tests on numerous circuit, topology,
and packaging designs. Your M-2b is a finely tuned instrument intended for critical professional
applications — we feel it offers the world's most elegant vacuum tube mic preamplifica-tion.
With the emergence of 24+ bit digital audio, recording engineers are faced with a new require-
ment for undistorted dynamic range. The M-2b meets this challenge exceptionally well.
Before connecting power to the M-2b, assure that the rear panel voltage selection fuse block
switch is set correctly. In the USA, the M-2b is shipped with the voltage selection block set to
100-120 VAC. At this voltage setting, a pair of 1 amp 5 x 20 mm slow blow fuses have been
factory installed. If you change the voltage selection block to 200-240 VAC usage, be sure to
change both fuses to 500 milliamp (0.5 amp) slow blow types.
The M-2b enclosure measures 19" wide x 3.5" high x 13.75" deep and is designed for mounting
into a standard 2U, 19" equipment rack. If the M-2b is mounted into a road case or other rack
which is prone to strong vibration or shock, it is recommended that the rear of the M-2b be
supported or otherwise reinforced to withstand such conditions. The M-2b requires adequate
ventilation. To assure proper air circulation and operation, leave at least one rack screw space
open above the M-2b chassis.
The M-2b is designed on a common ground topology. For high quality operation, and for your
own safety and the safety of others, do not defeat the purpose of the earth grounding pin on the
A/C power cord!
NOTE:
The M-2b is based on pure Class-A all vacuum tube design. Such topology performs best after
reaching a stable, warmed-up condition. All M-2b factory adjustments have been performed
when unit is fully warmed-up; at least one-half hour after turning unit on. It is recommended
that to achieve optimal sonic performance with the M-2b, allow a warm-up period of at least
one-half hour.