Tube vs solid state (with all apologies)


So… I’ve been building guitar amps for a few years… and very familiar with tubes and circuitry…  and just entering the audiophile world. 
Is there a definitive opinion or discussion somewhere for help in determining where and or when to apply either?
smolder
I run tube pre/ss amp combo in two systems. That is the sound that makes my feet flutter.  That may not be the case for you. There are great combinations of everything.  The only thing that truly matters are your ears,and your budget. jerryg123 touched on this point.  There is no way to know what you like until you hear it for yourself. Like any other hobby,one size does not fit all.   Build your system to impress one person,YOU.  Enjoy the music,and the journey.  
I’m biased towards ML speakers as well. I’ve owned over 12 ML speaker types in my life. I’ve owned Requests. They’re over 20 years old, so I hope yours have had a panel replacement. I currently own Spires and drive them with a 45 watt tube amp which has all the headroom one could use. I’d be willing to bet that my amp will drive your speakers. It’s not an ultra expensive tube integrated. It might work for you. Your Requests aren’t nearly as efficient but those panels would be better served by a tube amp than a SS amp. This is well known amongst ML owners. Tubes rule. How much an amp you need or can get by with is for you to determine.
The immediate plan is to horizontally bi-amp with an Adcom GFA 585 on the low end and the mc2100 on the high end. The Mc is a lot sweeter sounding in bi-wire mode than the Adcom. If that doesn’t balance out, I have the budget for a second 2100 and will go vertical. I don’t at the moment want to spend the bucks on a 275 tube amp.

I’ll be planning for either an mc275 or a tube preamp as a next step.

(oh, and the reQuest panels have been replaced)
@edcyn. 

Holy cow. I have never heard of so many problems with solid state electronic gear. I probably have owned 200 - 300 new (I’m throwing in iPads, iPhones, PCs, as well as audio equipment) electronic devices over the last 30 years and couldn’t come up with that many failures. A Sonic Frontiers CD player transport failed twice (but not the tube components), one iPhone… that is it.

I have never had a piece of audiophile gear fail in over fifty years (Unless you count the Sonic Frontiers Tape Deck… but I would not). No tubed gear problems either. I have a big pile of extra tubes I bought for equipment that I no longer have but never needed.