tube intergrated for NHT classic 2

I have an extra pair of the NHT classic 2 and I am thinking of getting a tube intergrated. At 86db/ 6ohm, Would a 50 watt tube intergrated do the job? My budget is under $2,000.00.
I used a Prima Luna Prologue 2 for about a year and loved the Prima Luna and NHT combination. I was using the older NHT SB2 and felt that the sound was almost 3D like. The speakers were shelf mounted and used in a room that was 10x15x8.5. I only listen so loud as I live in apartment, but I could crank the system if necessary.

Regards, Rich