Always wanted to see the SVT 3 Pro Preamp hooked into a class D power section as robust as the Quilter BB800. Dino? You still out here on TB? Sorry to the OP.. going off on a tangent here.
All tube SVT's are always worth fixing. You can't have a high performance car without it seeing a mechanic on a regular basis. I would check out Ampeg preamps mixed with a good power amp, as a possible standby.
Still waiting for Ampeg to release a all tube front end on a class D amp.