I have an all tube system and LOVE the sound. I have very sensitive speakers (105+ dB) and can support a flea watt (1.5 wpc) amp. I also have an Aric Audio preamp (Motherload XL) and sometimes match it with an Atmosphere Class D mono amps for extra volume in my very large listening room. I have to say the sound of using the Atmosphere Ds with the Aric Audio pre is very close to the sound of the same preamp paired with my Radu Tatra 45 power tube amp. With the Vandies, I think you would be very pleased with an Aric Audio > Atmosphere Class D mono amps. Quality of both the Aric Audio and Atmosphere are top notch and both have knowledgable, helpful and easily contacted builders.
My two cents
Good luck!!!

