Avalon Eidolon Diamond and Tenor Audio OTL

Costanzia,

I have not heard the Tenor OTL with Eidolons, but I would be concerned about the impedance match (not power output) for controlling the bottom end. I use an Atma-Sphere MA-2 Mk.II.3 OTL with my Eidolons (regular, not Diamond), and they are a great match together with marvelously authoritative bass, and the Atma-Sphere's have the neutrality, transparency, speed and resolution to complement the Eidolons well while nicely complementing the Eidolon's wonderful musicality and delicacy through the midrange.
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Excellent suggestions of the Lamm and Atma-Sphere. Enjoy!

I heard a lot about CAT amps driving Avalon speakers although I have not used any for my Ediolon. Lack of authoritative bass- can it be your preamp matching with your amp? If not, you might want to look into speakers positioning. I noted very minute change even in a fraction of degree for toeing in or out would make a big different to the sound. I took couple of years to get the right position for Ediolon--painful! In only for tubes-my taste as well. Believe it or not, I tried many tube amps with Ediolon before and they includes Jadis JA-500,VTL Ichiban,VTL-750,Hurricane ASL,Audio Research VT-100MkII etc.. spent a lot of money. I finally settled down with technology which is more than 30years old--a pair of McIntosh 275 run in mono block (150W per channel). The mid is something I will die for. The bass -- deep and authoritative. These happen only after I used combination of 12AX7 and 12AT7 for the small tubes and KT-88 as output tubes. I paired these amps with CAT ultimate preamp. Ironically,these amps do not cost me a lot for such an expensive pair of speakers.