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Paul, I think you missed the entire rational of my post. It is OK, people hear what they want to hear.

Anyhow juts one correction I would like to make. I did run the ML2 with generator and scope at full power. I had 21W at 19-20Hz. It was not even was close to the 40 watts on "peaks". Who said such a Moronity? What does not mean “peaks” in class "A" operating amplifier? It should be said to you by some kind of dealer or a reviewer.

Generally a power in SET descried by watts at anode, transformer current (size of the gap) and frequency (via inductance). Since inductance and max current in ML2’s OPT are fixed you have a reversed correspondence between frequency and power: the lower frequency you look at the sooner clipping takes place. I have to admit the ML2 did cared LF very gracefully down to 11Hz (with limited power or course) but it was not even remotely close what a dedicated LF transformer is able to do. In fact it is not necessary to measure: as it is clearly also auditable in context of any LF capable installation.

BTW, the only one interesting thing that I see, that might be expanse but worth to try, would be to had a DSET with LF channel made around a transformer with huge-core mass but using a very fast core. It might be very expansive and virtually imposable to get (for 6C33C for instance) amorphous core enough for make 20H OPT. If someone know where to get such a core  then, please, let me know.

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