OTL recommendations for 105+ sensitivity horns

I'm running Atma-Sphere M60MkIII OTLs with Avantgarde Duo Omegas 108 dB sensitive horns. At first I did have noise issues to deal with, but due to my own fault. A terrible hum that I had never heard before with 92 dB sensitive speakers. I had a ground lifted that needed to be put back in place and that solved the problem. If you have a noisey tube in the gain section of the amp you will definitely hear it. The M60s use 2 gain tubes, for high sensitivity horns you remove the second gain tube and insert a shorting plug to reduce gain. The S30s only have one gain tube and I belive were designed with higher sensitivity speakers in mind. I also use Atma-Sphere's MP3 pre amp. With my ear to the mid horn I have to strain to hear any noise and the treble horn emits a barely audible fuzz. There is something to be said for minimum or no crossover designs used with an OTL. If you search the member systems, there is another member using M60s with DUOs.

Take a look at the Transcendent Sound website, they have a single ended OTL amp that looks interesting and other OTL amps with more power.I know that you said that 2 watts wouldn't be enough for your speakers, but with 105 db sensitivity spec I think that 2 watts should be plenty, but I don't know which speakers you have. It all depends on the amp and also the impedence of the speakers and if they have complicated crossovers or not. Take for instance my single ended amp from Decware which puts out more power into lower ohms, and the Transcendent Sound single ended OTL amp puts out more power into higher ohms, so matching a low power amp to a certain speaker requires some investigation. Synergy is everything!

I use with my 100dB Horns the M-60 II OTL amps. No noise, silent and very reliable. and the Tubes last forever....
You can also work with a jumper, Ralph has it, to reduce the output power.
But the Stereo amp will be interesting, too.

I use Ralph's latest S-30 Mk III with my Audiokinesis Planetarium Betas (96 dB, near flat 16 ohm impedance), and absolutely love it. Noise is essentially non-existent.