After extensive research we have finally found an upgrade tube for the Music Reference RM-200. Especially recommended for the RM-200 and other 6550/KT88 amps these tubes can run at bias currents up to 60 mA. They will providing lower distortion at all bias settings, better bass and higher damping, significantly improving the sound of the amplifier.
These tubes are tested at very high voltages up to 700 volts so they work well with anything.
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