Nuvista Tubes - General

Hi @georgehifi 

Your reply is a bit "over-my-head", but I glean the gist of what you're saying/writing is to avoid designs that use nuvistor tubes? 

To your point about needing to have capacitor or transformer coupling, is this something unique to nuvistors? (meaning vacuum tubes do not have capacitor or transformer coupling)

To your point about needing to have capacitor or transformer coupling, is this something unique to nuvistors?

No, directed at all tubes, unless direct output coupled.

I don't believe anyone has made a tube amp/preamp that is direct coupled (no caps or transformers in the signal path) from input to output, like you can with solid state.

Cheers George 

@viridian 

Do you have an opinion (and care to share) of the Musical Fidelity amplifier products/designs that use nuvistor tubes? I'm currently using an M6si which I'm very happy with, but the "nuvista" series is their top-of-the-line offering. Thanks.