Summary of Contents for Music Reference RM-200 MK-I
- Page 1 Music Reference RM-200 MK-I and MK-II 100-Watts Per Channel Stereo Power Amplifier Owner’s manual 2010 Music Reference/RAM Labs Santa Barbara, CA 805 687 2236 www.ramlabs-musicreference.com www.tubeaudiostore.com...
- Page 2 LINEAGE The RM200MkI/MkII evolved from Music Reference’s classic RM9, the RM10, and the state-of-the-art Music Reference RM9 Special Edition. The RM200MkI/MkII achieves a news standard for musicality in stereo amplification. Using only a single matched pair of KT88 of 6550 output tubes per channel, the RM200MkI/MkII easily achieves 100 watts per channel.
- Page 3 (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.
- Page 4 OUPUT TUBES The output tubes of your RM200MkI/MkII are set up as matched pairs by RAM Labs (www.tubeaudiostore.com) for optimum performance when working in push-pull. The two pairs are matched by RAM Labs (www.tubeaudiostore.com) to less than 10% variation in bias and transconductance (Gm). Both output tubes in each pair will then share the workload equally.
- Page 5 STEP-BY-STEP OUTPUT TUBE BIASING PROCEDURE RM200MkI/MkII Tube Biasing instructions (written for 4-Ohm speaker tap use): 1. Adjust your voltmeter to read DC volts, 200 milli-Volt range. 2. Turn on your RM200MkI/MkII amplifier and allow your RM200MkI/MkII to fully warm-up (approximately 15-minutes). Please note your RM200MkII has two 70-Amp rated “high in-rush”...
- Page 6 To reduce the "Average Bias Reading" from "37mV" to "35mV," please adjust the right channel Bias pot (ie. "V4," and "V6" output tubes) so that together, both tubes average "35mV" (ie. set "V6" to read "36mV" and set "V4" to read "34mV"). 9.
- Page 7 For your protection and safety, always replace with identical or comparable fuses. DO NOT SUBSTITUTE! Using a different fuse will void your warranty. You may order additional fuses from RAM Labs/Music Reference (www.tubeaudiostore.com) or your dealer. WARNING: Do not use “Tuning Fuses”, “IsoClean”, “Furutech” or any of the high-end fuses as they have already shown that they are unable to protect the tubes and output transformers.
- Page 8 If the sound did not change channels, then turn your amplifier off, allow the tubes to cool, put the tubes back in their original positions, and contact your dealer or Music Reference for further assistance.
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Page 9: Trouble Shooting
TROUBLE SHOOTING While it is highly unlikely that you run into all, if any, of these situations, the following are some test procedures that you should run in the event that your RM200MkI/MkII appears to misbehave (the vast majority of problems encountered are attributed to noisy tubes and improper component placement or grounding): DISTORTION Output tube distortion usually results from one or more of the output tubes becoming gassy... - Page 10 To replace the blown tube fuse, turn your amplifier off, replace the 250mA Slow Blow, High Interrupting tube fuse, rap the output tube with a pencil, and turn your amplifier back on, again. If the tube fuse blows immediately, then the tube has a short and needs to be replaced.
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Page 11: Specifications
SPECIFICATIONS RM200MkI RM200MkII RM200MkII-T 15kΩ One Leg 30kΩ One Leg 30kΩ One Leg INPUT Driven (Un- Driven (Un- Driven (Un- IMPEDANCE: Balanced)/ 30kΩ Balanced)/ 60kΩ Balanced)/ 60kΩ Balanced Balanced Balanced INPUT 1.1 volts for full 1.1 volts for full 1.1 volts for full SENSITIVITY: output output... - Page 12 KEEP ALL PACKING/SHIPPING MATERIALS Please keep all packing and shipping materials in case you move or need to ship your RM200MkI/MkII. Replacement Packing Sets are available for purchase directly from RAM Labs. TUBE SEATING CHART TRANSCONDUCTANCE TUBE POSITION SERIAL NUMBER BIAS (Gm)
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