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Hi
While I agree to some point you would have to specify exactly WHICH vari mu unit you were wanting them for as the nature of valves is that the characteristics change with applied voltage and expected current. Just because the two 'halves' if the valve have equal characteristics in one application, if you change parameters they may well not be matched elsewhere.
Matt S
'Straight A star' graduate students and shoot all others that 'fail' the grades?
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