Inexpensive tube amp

I'm looking for an inexpensive but yet decent quality tube amp to pair with my new Zu Omen bookshelf speakers. I've noticed that there are a lot of integrated amps out there, but I would rather and Stand alone amp to pair with my existing Preamp. The preamp is a modified Acurus unit from back in the day. However if I cannot find an inexpensive amp an integrated unit might be okay. My budget will be between 300 and $400 new or used. The source will be an old pioneer turntable. Nothing special just an inexpensive analog front end to listen to music in my small room.