Best tube integrated under 1500 new or used

TAD-60 Signature... This is a great amp with many user-friendly adustments and features that allow you to tailor the sound to your power requirements and taste. It can use EL-34s, 6550s, or KT-88s and can be switched for triode or ultra-linear operation. And the amount of feedback is continuously variable and can easily be dialed in to taste. I'm presently using mine with the stock EL-34s in triode mode with minimal feedback. It sounds quite impressive powering the new Silverline Prelude speakers.

Also, it's built like a tank, uses over-spec heavy duty parts; and it's internally point-to-point wired with quality silver wire. And it looks quite nice as well.

Tvad, yes, (I guess I was thinking of the TAD-150 Signature preamp). The upgrade with the Auricaps and the filter caps is the model I was referring to. I don't think there is a TAD-60 "Signature," just this upgraded version. And I would definitely recommend going for the upgrade as I'm getting pretty impressive, tight, and controlled bass out of this unit.

Another thing to ask for (even if it costs a little extra) is Paul's heavy-duty gray power cord. It made a nice improvement in sound over some much more expensive cords I tried.