Yup that's mstage HPA-3B. I used to have the mstage v1.2 (sold it), but always curious about balance setup. The ember on dual tube easily rival the mstage soundstage though
i have the gustard h10, and love it, i don't think it can be beat for the money, and it's my favorite solid state amp i've ever had, i like it more than the bryston bha-1 i had.
the has been some talk on the gustard thread about the mstage, which sounds intriguing to me.
my teac is dual mono, and has balanced outputs, the h10 is dual mono with balanced inputs, but no balanced output.
i've seen a comparison between the h10 and the hpa-3b, and the guy comparing said the mstage's balanced headphone out beats the h10, but the h10 beats the mstage
in single ended operation