Your budget range will allow you to purchase an excellent quality amplifier. I’m much more familiar with the 300b genre than the 2A3 but I believe that either would work in wonderful fashion with your Coherent Audio speakers. Triode Lab uses Hashimoto transformers and chokes. I know that Allnic goes a different route with “permalloy “ iron in their amplifiers.
Allnic also believes a “bit” of NFB is desirable (Lower output impedance thus higher damping factor/DF). I’m pretty certain that the Triode Lab is purist zero NFB. Does Frank feel the added NFB is necessary or a factor with his speakers? Allnic utilizes 6 db NFB. Anyway both of these brands are well thought of. With those speakers get the best amplifier you can afford. You’ll have superb sound quality for many satisfying years.
Charles