Speakers that are good with tubes

+1 for the DeVore O/96 

Here is the "tube friendly" speaker article....

https://www.dhtrob.com/overige/tubefriendly_lsp_en.php

Many of the pitfalls users are describing that torpedo  tube amp performance are just poor speaker design.  So I'll add to my suggestions:  Buy a well designed speaker.

It does not have so be 8 ohms or above.  My speakers are 4 ohm, but they are very, very flat and very well designed.  I bought them to use with an ss amp.  The first time I heard them with a tube amp, I promptly sold the ss amp.

Jerry

It does not have so be 8 ohms or above. My speakers are 4 ohm, but they are very, very flat and very well designed. I bought them to use with an ss amp. The first time I heard them with a tube amp, I promptly sold the ss amp.

The boldened words are correct, of course. 

Using 4 ohm speakers is all good if your tube amp has a 4 ohm tap.

Otherwise not recommended if tube amp has a nominal 8 ohm tap which is probably OK for speakers rated between 6 and 10 ohms.

@noske You can have a 4 ohm nominal speaker sound just fine running the 8 ohm tap on a tube amp.  My experience has been you just have to try and see what sounds best.  Even the manufacturer will say this.