Do pickup covers affect tone?

Humbucker cover tone. Do humbucker covers affect tone? Nickel vs brass vs none. I compare all three and we remove as mnay variables a possible then compare the sounds and use a spectrum analyser.
Actual Nickel humbucker covers (and brass if that's what you want) - www.axesrus.co.uk/Humbucker-C...
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➤Time Stamps
0:00 Introduction and the experiment
1:32 How it sounds with and without humbucker covers
2:08 some thoughts on the sounds
3:25 More sounds including spectrum analyser
4:43 Conclusion
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