Tube Pre-amp under $1000

Juicy Music Peach - used. It has a selectable Lo output impedance of 90 ohms (maybe it's 80 ohms) that's ideal for solid state amps.

It's a tremendous sounding preamp for the money.

They occasionally come up used for around $700. They're $1495 new, I believe.

The Audible Illusion preamps give you good bang for the buck.

Juicy Music Peach is indeed "Juicy".
Another one worth mentioning is Mapletree Audio Line 2A SE line preamplifier and PS 2 power supply for $820 direct or $720 as a "kit". This one is "Music"
..........and Reference TVC passive preamp from Promitheusa Audio and this one is like a "Peach"