Laurentgilles, you will do well with any tube amp that has an 8 ohm tap and maybe a little better if it has 16 ohms.
When you drive a 16 ohm load using the 8 ohm tap, what happens is that the load impedance that the tube(s) see(s) is also increased. The output section will then make less power, but the distortion that the power tube or tubes make will be reduced! However, the transformer will make increased distortion due to some ringing, which will be minor.
Of course, a low-power OTL will drive a Fertin effortlessly, and with greater transparency than you will be able to get out of a transformer-coupled amp driving 16 ohms. So instead of limited choices, your speaker actually gives you a wider range of choice than many speakers do. Everything I have heard about Fertins suggests that they are *awesome*... Have fun!!