Need help ! Looking for a low cost integrated tube amp for my office


Looking to upgrade my office system
Music playing through my computer to an Audio engine D1 DAC
At present an old NAD receiver playing to four Vienna acoustics Haydn Grand book shelf speakers and a velodyne sub
Thought I would try my first experience with a tube integrated amp 
Any suggestions ?
fullerco
Using a tube amp with 2 pairs of 4 ohm speakers is not an option!
 Specifications
  • Impedance: 4 Ohms
  • Frequency Response: 42-20,000 Hz
  • Sensitivity: 89 dB
  • Recommended Amplifiers Drive Units: 25-180 watts RMS
  • 5” Bass/Midrange Driver: X3P Cone, Transparent
  • 1 ” Dome-Tweeter: Hand-coated VA Silk Dome
  • Bass System: Bass Reflex, Front Ported
  • Bass Function: Impulse Optimizing QB 3 (Quasi-Butterworth)
  • Crossover Components: MKP Capacitors 1% Tolerance
  • Coils 0,7% tolerance, Exclusively Air Coils
  • Metal Film Resistors, 1% tolerance, Inductance Free
  • Crossover Function: 2-way, 6 dB and 12 dB Bessel
  • Weight per Pair: 44 lb / 20 kg
  • Dimension (W x H x D) inches: 6.85 x 14.2 x 10.4“
  • Dimension (W x H x D) mm: 174 x 361 x 265 mm


Sounds like from your post you are looking for something affordable to pair with those speakers. I can say Jolida and Cayin both have some great sounding integrated amps for good prices especially used. 
Wanna spend more the Octave V110SE I heard recently was pretty damn awesome. 
Call Dave Thomson at Raven Audio.  Check out their website.  Outstanding integrated amp for anyones budget.   Superior Customer Satisfaction and some of the most classic tubes around.  
If low cost is what you are looking for Steve Guttenberg did a review of this inexpensive tube amp

https://youtu.be/vCk12xzivp8