Advice using electrostats with tube amp.

I need to make a correction.  Although it would have no bearing on the subject of impedance, the speakers in question are the Ethos (not Theos) which, as well as with the Odyssey's before them, I had been using with the Peachtree 220 amp. Today I'll be transporting the Cary to the guy's house who has my old  Ethos for a trial. Room acoustics there are significantly different than mine but I should get some idea about the overall sound. Also, I've been running the amp in triode mode with the reference 3a's and someone suggested that that switching to ultra linear may make a better match. Using the 4 ohm posts also came up in that discussion.  BTW, I've used mostly panel speakers for over 40 years (Acoustat, Magnepan and ML) so my familiarity with them is the only reason I'm even at trying this. I really thought my current setup would be the forever one. We'll see. 

Gdnrbob, thanks but I reviewed the Odyssey's before i bought them new and the info I found indicated somewhat the same thing as you found. However, multiple knowledgeable members here provided information that certain conditions can result in impedances  <1 ohm.  I know that there are those using tubes with electrostats but ive not heard of any in combination with my model amplifier. Also, I'm not aware if the Ethos has this same dramatic impedance dip as the Odyssey under similar conditions. 

Sfall, the room is about 15X20' with 8.5' ceiling but my listening position is only about 13' from the speakers and i dont listen at high volumes. I agree withyou, then, that it should be fine but because the purchase is not a small one for me, I'm trying for all the advice I can get. Thanks

Stringreen, I already have the Cary so that's the starting point for my inquiry because it will probably stay in the system.   It'd sure be interesting to know the basis for your advice though as it may help with the decision re the electrostats. 

Thanks, Al. I was hoping you'd see this post. As always you provided exactly the kind of direction that I needed. I wasn't specifically looking for the potential of generally over emphasized mids, but I did detect a hint of that in the lower mid frequencies that you suggested and that I had also experienced with the Odysseys using Rogue and Peachtree  solid state amplification. This issue is not significant enough to affect my decision to buy them back and I did just that. Not just from a budget standpoint was this a very hard decision but stepping away from the Reference 3A's is particularly distressing. I hope i can get a reasonable offer for these amazing speakers. I did the audition using the 4 ohm posts and tried it on ultralinear as well as triode settings. As with the Serie's i found the triode mode somewhat more pleasing.

BTW, because i have a loaner pair of Cary made AES SET2 monoblocks currently set up I tried them with the ML's also. Theyre ok but the Cary is a bit warmer sounding to me.  Thanks once again, Al.       Jim

Atually, the "warmth" that I heard and generally favor with the triode mode
was a bit too warm approaching somewhat dull. I switched to ultralinear for overall improved upper mid detail. Just an FYI.