If it is higher at one watt it will be higher at full output also. The idea is that the top end will take much less power to drive so you assume that it is the top that will need attenuation. I am not sure that in every case it would be necessary for the top to have more sensitivity if that is where you have the volume control as you are likely to be using less power there but it is a good precaution. This combination is a little harder to pull off than tube-tube or SS-SS combinations but many do it, it may just take a little time to sort out.
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