Mikkelsens Elektronikk CO-RU200 User manual
Mikkelsens Elektronikk
Page 1 of 3 CO — RU 200
Address: Nygaardstubben 5 Phone: +47 66 91 92 95 Giro: 9710.4771789 Company no: NO-946971243 MVA
Ref. no: 99DE009
Date: December 1993
CO - RU 200 RIAA UNIT
Description:
CO-RU200 is a double stereo precision preamplifier for recordplayers with a mono monitor unit for easy
cueing of the two playes.
The inputs are equalizied following the RIAA-norm and is amplified up to line level (0dBU), not phono-
level as most RIAA-amplifiers on the market!. The outputs are electronical balanced to futher match
professional equipment, thus reducing the possiblity of noise pickup to a minimum.
At the monitor-unit You can switch between Q1, Q2 and off. There is also a 1/4" jacksocket with an
internal switch, to switch off the speaker, for the use of headphones instead of the build-in speaker. The
volume control is a VCA-system to reduce the cabeling of sound signals.
The main unit is provided with four holes for mounting under the table, nearby the two recordplayers. The
monitor unit is placed on topp of the table between the two record players, and is mounted with two 4mm.
maschine screws going thru the table. A layover for the drilling of the holes in the table is provided,
where you also get the third hole for the multicable going from the monitor unit to the main unit. That
gives You a clean and sturdy mount without any visible cables at the top of the table.
Mikkelsens Elektronikk
Page 2 of 3 CO — RU 200
Address: Nygaardstubben 5 Phone: +47 66 91 92 95 Giro: 9710.4771789 Company no: NO-946971243 MVA
CONNECTIONS:
Marking Description Connector
Q1 Left and Right channel PHONO Unbalanced
L R input from recordplayer 1 Center: Signal
Chassis: Ground
Q2 Left and Right channel PHONO Unbalanced
L R input from recordplayer 2 Center: Signal
Chassis: Ground
GND Commond ground for the Terminal Post
recordplayers.
Q1 Balanced line output XLR-3M Balanced
L R from left and right 1: Ground
channel recordplayer 1. 2: Signal (+)
Linelevel (1.22V) 3: Signal (-)
Q2 Balanced line output XLR-3M Balanced
L R from left and right 1: Ground
channel recordplayer 2. 2: Signal (+)
Linelevel (1.22V) 3: Signal (-)
NB! When the outputs are connected to unbalanced inputs do not connect pin 3 (Signal -).
Do not connect pin 3 to pin 1.
Mikkelsens Elektronikk
Page 3 of 3 CO — RU 200
Address: Nygaardstubben 5 Phone: +47 66 91 92 95 Giro: 9710.4771789 Company no: NO-946971243 MVA
Montage:
First place the monitor-unit (loudspeaker) between the recordplayers in such a manner that You can
operate all units without any problems. Remove the protective cover on the bak of the drilling drawing
and stick to the table where You want the monitor-unit to be. Drill two 4.5MM. holes and one 25MM.
hole in the table. Remove the drawing, put the cable from the monitor-unit through the table and fasten
the unit with two 4X40MM. screws from underneath the table. The unit may be slightly out of vertical
alignment, that`s quite normal.
NB! Be aware of that if the table is thinner than 25MM. then the screws must be shortend or changed to
two shorter 4MM. screws NB!
If the table are thicker than 35MM. one have to use longer screws.
Max. length of the screws are the table thickness + 15MM.
Min. length of the screws are the table thickness + 5MM.
Then You mount the main-unit underneath the table using four wooden screws (not included) in such a
place that all cables are going nicely to and from the unit. The cable from the monitor-unit are connected
to the main-unit. The power-supply are connected to the mains, and the cable are also connected to the
main-unit.
The sound connections are made according to the description on page 2.
On most proffesional recordplayers there are a separate earth-wire. If it exist, be carefully to connect them
together (one from each recordplayer) at the terminal post marked GND. Failure to do so will result in a
strong hum at the outputs of the unit.
