SET vs OTL

 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?

Thanks it was Audioaero. This was a good P.P. amp. that was flexible on which power tubes were used. I think I ended up using some old stock  6550s. This amp used 6SN7s as drivers and I was smitten by the Tung-Sol round plates in this application. Using P.P or S.S. designs sure makes life easier in many ways. 

Oh and so you know, much of the auditioning of amps was done on a pair of DeVore 0/96s which responded very well to changes in amplification. A speaker which is better than the sum of its parts and I mean this in a very positive way, although this was not my personal speaker.