It does not sound like a set amp. Only set amps sound like set amps. Solid state amps are only going to be an approximation, but leave you lacking.A push-pull tube amp with a single-ended input will exhibit a prominent 5th harmonic in addition to the 2nd and 3rd. Mathematically, this is the result of this type of amplifier having both a quadratic and cubic non-linearity. So it will tend to favor odd ordered harmonics to a certain degree, and higher ordered harmonics will fall off at a rate similar to that of an SET.
This reinforces the complaints that SET lovers often level at Push-pull amplifiers. Its nice to know that the math and measurements support what the subjective camp (SET lovers) is saying in this case.
However its important to understand that an entirely differential push-pull tube amplifier expresses a cubic non-linearity, which IME is even easier to listen to than SETs. I think this is the bit that the SET crowd misses and its not surprising because I’ve yet to see any designer of SETs talk about a quadratic non-linearity.
What is important here is that the subjective camp, theoretical mathematics and practical mathematics are in agreement about what we experience as audiophiles.
I don’t like to take sides on the objectivist/subjectivist debate. I see it as a bit ignorant; in particular when objectivists talk about ’being measurable’ they usually don’t have a clue about what to measure (although they are otherwise correct). As a result for the last 40-50 years they’ve been pushing amplifiers that have increasing distortion as frequency is increased and so sound bright and harsh, especially when driven to higher output levels (and this due to the simple fact that these amps employ feedback in insufficient amounts). That’s not objective IME; its simply expressing poor taste.