Best Preamp with Tape In and Tape Out Monitoring Capability

Check out CODA and Threshold preamps.

I recently researched this very subject. Tape loops are hard to come by these days, but here are few that have it: Higher Pass models - XP-22 and up, BAT preamps, Accuphase (pre and integrated), Luxman.

Solid state Accuphase, tube Atma-Sphere. If you need more tape loops, check out the Sony SB-500.

Van Alstine preamps have the tape monitor feature!

While I don’t make use of it, my Linear Tube Audio microZOTL 2 preamp has a tape monitor. I also use it with a Pass XA25 power amp.

Thanks for all the replies and now to review all your suggestions 

Luxman CL-38uc