Solid State to replace Audio Research REF110?

I guess I would ask the OP if the blown tube was an ARC tube, or from a different seller. ARC stands by their tubes and offers a warranty for a time period to include repairs. I have owned five different ARC tube amps, VT100mk2 through my current Ref150. The only time I had an issue was when I bought tubes from another supplier to save some cash. That cost me plenty, so I recommend ARC tubes for ARC gear.
Also, ARC does not fuse the amps in this way for performance reasons. If you want a lower performing tube amp which will blow a fuse, those are available.
I will say that I am seeing these solid state amps recommended as alternatives and having owned many of them, well, they are not in the same ballpark as your Ref110. That said, I do own an Ayre VX-5 which is a great solid state amp. Note that this is NOT the V5xe.
Just my .02

There are lots of tube amps that can equal or out-perform ARC amps AND have fused protection for the output tubes. Any output device tube or solid state can fail. A design that results in a major, $$, cascading failure as a result of a reasonably anticipated event, IMO, is not "good" design. Flame away.

Swampwalker, I've been down "tube arc road" several times. Yes ... it's true, most times the tube arc took a bias resister out. But no flames, explosions, cascading oscillations that blew speakers, or Fourth of July explosions and sparks.

Yes ... it's also true that replacing the bias resisters is a PITA. Fortunately, there's an ARC authorized service tech about a 30 to 40 minute drive to my house who happens to make house call. It takes the rep about 30 minutes to pop in a new resister and I'm back in business pretty quickly.

Gary (Hifigeek) is an authorized ARC service tech. Perhaps he can bring some perspective to this issue. My guess is that this is more of a tube thing than a design thing. Tubes arc -- period. When they do, they will pop a fuse or a resister. If one owns tube gear -- this goes with the territory. Just my opinion.

I'm with Swampwalker on this issue. There are definitely tube amplifiers
that sound excellent and will blow a simple cheap fuse rather than take out
a resistor. I don't buy the ARC sound quality argument either. ARC is good
but there's better (matter of taste). A good friend had ARC for several years
and replaced it with VAC components which will blow a fuse instead of a
resistor. Nice as the ARC (no knock) was we both felt that the VAC was
clearly a step up in sound quality. ARC may have their own reasons but the
"better performance" doesn't hold up. Replacing resistors is an
unnecessary inconvenience compared to replacing a simple fuse.
Charles,

Charles ...., I hear ya. Don't know what to add to what I've already said. Yes ... bias resisters may blow if a tube arcs and since I am not comfortable taking a soldiering iron to my amp, replacement is a bigger deal than it should be. My gut tells me that if -- and that's a big if -- there is a denigration in sonics, it might be worth the trade-off to insert a fuse into the signal path. Again, maybe Gary (Hifigeek) will weigh in with his reality check reactions.

Happy New Year to all.