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The basically the same tubes. The 6E5P has own unit pins layout with heaters connected across the tube – very moronic in my view and it does not allow twisting the AC filament wires to the very end. The 6E6P has a common pins layout that most of western tubes of the same type use (D3a/7721and etc). The 6E5P is a bit larger and can dissipate heat better when you drive anode closer to 7W-8W.  They have different data in datasheet but it only because the 6E6P has more strict parameters and therefore on paper it provisioned for lower voltage, voltage power and shorter life. In reality is just because 6E6P the residual requirements for 6E6P were higher. The 6E5P considered consumer tube but 6E6P had a military version – the 6E6P-DR. Those tubes had ever more stringent requirements and the data on them was QA after the tube was burned out. Some of them had gold pit and so on. BTW, if you buy the DR tube then you will see that they even new look like they were used with darken glass – this is the result of pre-burring on factory.

Both the 6E6P and 6E5P need to be use in the same way – 200V on plate and no less then 15K on anode. Do not forget the grid sopped – they are very fast tubes.  Stonily they are very similar in my view with a very slight advantage of 6E6P in delicacy and softness. But it is VERY minor, near negligible. Among all 6E6P and 6E5P that I had I have seen only one that was microphonic.  Be advised that those tubes tine pick up some HF nose as they age and become worn. Also be advised that both 6E6P and 6E5P are noise what they cold. As the heat up they shall become calm and silent, usually it takes 5 minutes. I do not know what you mean “respond differently regarding vibration” are you heating them with baseball bat and mount them on a top of  the Vibratex Rabbit Habit Vibrator?

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