I find this a very revealing way to instantly compare how amplifiers sound one to the other. I believe in almost every case we have already chosen the amplifier we prefer before we hear it. In swapping amplifiers, we change volume levels for one thing and that makes every amplifier sound different. This type of of A/B test may not satisfy your preconceived notion but I think it is pretty real.
I did not listen to this setup prior to making this video. I was certain there would be some "obvious" difference in the sound of a 300B SET and the Dynaco ST-70.

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