SET vs OTL

P.S. Push pull designs and SETs are very different, The overtone characteristics of SETs make for a much more nuanced and colourful sound. The differences tend to be most pronounced via horn designs. Obviously pp is higher output.

 I agree that using an auto-former somewhat defeats the purpose of an OTL and would not be an option for me.

 Correct using a "Zero" type autoformer is a "bandaid fix" for an OTL amp that is not suitable for that speaker loading, far better off getting the right amp.
OTL's that tend to suit speakers without having to use autoformers, then speakers then are mostly not that accurate, like I said it's a "catch22" 
If you still want to use P/P tube, to use a P/P tube amp that has a "proper output transformer" as part of the amps design and feedback configuration.

Cheers George

P.P.S

The French company might have been Jadis or Audioaero, both of which build good amps.

BTW, both on OTLs and on SETs low capacitance speaker cables are clearly preferable, think Shindo or similar

Do you guys that run low powered set amps prefer tube rectification or solid state diodes?