I don't have experience with the 804N, but I do have experience with the current 804 Diamond model, and I suspect there are a lot more similarities than there are differences between the two. If the 804N is anything like the 804 Diamond, a solid state 80w/channel is not going to cut it. I can't speak to what you'd need in a tube amp, but if you go solid state, don't even consider less than 150 w/channel unless it's a really high end piece of equipment. Also, 804's are considered by some to be a bit weak in the bass department so you will be well served by an amp that is notable for its bass reproduction.
I use Musical Fidelity M6PRE/M6PRX separates with my 804 Diamonds with wonderful results. The M6PRX is 260w/channel, a far cry from 80. Classe and McIntosh are also great pairings with the B&W 800 series.
I use Musical Fidelity M6PRE/M6PRX separates with my 804 Diamonds with wonderful results. The M6PRX is 260w/channel, a far cry from 80. Classe and McIntosh are also great pairings with the B&W 800 series.