P90 keeper bars - yay or nay?

[Meowy]

Do you use them? Do you get a perceivable difference with/without them?

[SkinnyWire]

Yes ... and no.

[Possum]

...........

When I started making P90s I did them like Lollar does and learned from his book. Of course there is a difference, the keeper loads the circuit with metal so there is some eddy current action being added there. Without one you get a more direct kind of feel, its hard to describe but yes there is a difference, if you want a true vintage P90 vibe you need to have one in there......

[NightWinder]

You get more Crack to the Whip with the keepers too as without they can get thin...but knowing your application ahead of time can get you into some different winding technics to compensate. I'd start with it: )

[Zhangliqun]

Definitely brighter and spankier without the keeper in my experience.