Yes, I did try all combinations of output taps. 1-2-4-8-16 ohms.
Differences from one tap to the next one are small but obvious. Generally lowest transformer ratio gives the most open sound, in this case that would be 16 ohms. This output had the best midrange, like vocals and some acoustic instruments also stereo imaging was excellent. What was missing was something in frequency extremes, lack of clearness and control.
For me the best compromise is 8 ohm taps, still excellent in midrange and better balanced through out frequencies. Going to 4 ohms gives greater control with less sweetness and 3D space but still good choice for electronic and highly processed studio music.
Basically any transformer output tube amplifier would prefer easy load, such as high impedance and high effiency horn speakers and then a sub 10W SET could be the solution.
Point is to choose correct output to match your speaker and your preference.
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