PelliX
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The St James looks interesting. Judging by the AC input range tolerance, they subbed the PT for an SMPS. With sufficient smoothing this can work, it's not an inherently bad idea per se. There is no OT, just a "reactive load" as they describe it. So that's ~50W of heat being dissipated in there, nice. The speaker output is presumably fed from the "DI" from the load and driven by solid state. Provided the solid state is nowhere neat saturation/clipping that will give you an accurate reproduction of your valve "output" stage, presumably.
Some of their old-fashioned valve heads sound great, never tried any of the newer types.
Some of their old-fashioned valve heads sound great, never tried any of the newer types.