and each of your sources to determine the configuration for each component is your
system. Do not expect large differences in the change of hum…
Connect the INPUT to the LEFT and RIGHT XLR connectors located behind your
RM200MkI/MkII’s transformer cover. Should you be using your RM200MkI/MkII with a
preamplifier or other source that lacks balanced (XLR) inputs, then please use an RCA-to-
XLR adaptor or re-terminate your interconnects with XLR plugs. In accordance with
industry standard, Music Reference defines XLR Pin No. 2 as HOT.
Connect your speaker cables to the brass binding posts located behind your
RM200MkI/MkII’s transformer cover. Note the “Impedance” markings adjacent to each
speaker binding post. Since your RM200MkI/MkII is a fully balanced amplifier from input to
output, you will notice the 4-Ohm and 8-Ohm speaker outputs/binding posts are not ground
referenced. For these two impedances, the speakers are connected to the “+” and the “-“
terminals of the appropriate impedance.
Additionally, 2-Ohm and 1-Ohm speaker taps are provided. These quite low speaker
impedance taps can be very useful for loudspeakers that exhibit very low or unruly
impedances. Feel free to experiment with different impedance connections.
“LIGHT LOADING” YOUR RM200MkI/MkII
You may always connect an 8-Ohm speaker on your RM200MkI/MkII’s 4-Ohm speaker tap,
however, not the other way around. Your RM200MkI/MkII amplifier actually appreciates the
“lighter load,” and the tubes will last longer. As long as your system will play loud enough
without clipping, then “light loading” your RM200MkI/MkII is preferable. Your
RM200mkI/MkII amplifier will also have higher damping (woofer control) and lower
distortion.
Always use the same impedance value for your right and left channel.
TUBES
Your RM200MkI/MkII is factory-equipped with 2-each 6BQ7 driver tubes, and 2-each
matched pairs of KT88 or 6550 output tubes. Each of these tubes has been specially tested
and selected for your RM200MkI/MkII by RAM Labs (www.tubeaudiostore.com) using
specially developed testing and matching procedures that allow you to operate your output
tubes at a higher bias resulting in lower distortion!
Please record the serial number, Bias, and Transconductance (Gm) of each tube (marked
on the label of each tube box) on in the corresponding position on the Tube Seating Chart
located at the end of this owner’s manual. Please refer to these Bias and
Transconductance (Gm) values when ordering replacement tubes from your dealer or RAM
Labs (www.tubeaudiostore.com). Please keep this manual with your most
valued documents. It will be very important should you ever need replacement tubes.
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