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. They will also track evenly as they age and dissipate. For optimum
performance, always use RAM Labs matched output tubes as other vendors only match for
either bias or transconductance, but not both. They also may not test their tubes at the
correct operating values for your RM200MkI/MkII.
BIASING THE OUTPUT TUBES
Your RM200MkI/MkII was fully adjusted and calibrated at our factory. No further
adjustments are necessary.
However, we highly recommend checking the bias of your RM200MkI/MkII’s output
tubes every few months (check tube bias at least twice-a-year).
This is a simple procedure that requires the use of a voltmeter.
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