I've owned electrostats for almost 15 years, starting with Acoustats, Martin Logans (3 models), and finally large AudioStatics. All of these speakers were nothing short of amazing with OTLs. In fact, I would suggest that OTLs are the only way to get the absolute best from an esl. It is true that I had the benefit of 140 watt OTL monoblocks. Given the fact that your 75 watt OTLs would only be about 3 dB lower in maximum spl, I would still suggest that you try them. You may find that they are more than up to the task. Yes, this system may give up some dynamics compared to better cone systems, but the midrange/top-end can be a revelation. Particularly in a smaller room, the power issue becomes even less of a concern.
As is always the case, auditioning a speaker with your amp is certainly the best way to dispel all concerns. Good luck in your audio search.
As is always the case, auditioning a speaker with your amp is certainly the best way to dispel all concerns. Good luck in your audio search.