Help choosing a Preamp. Any info would be appreciated.

I have a WOO WA3 Headphone amp with the preamp output option. I love the sound of it even tho I am using a headphone amp as my primary preamp. Since I rarely listen with headphones anymore I am looking for an all Tube Preamp as good as the preamp output of the WA3. Have been trying to get an older WA2 since they also have the preamp output, but with 4 inputs instead as 1 like my WA3. Any other preamp suggestions would be great.