Pure Class A SS vs Tube Amp

Funny you should ask as I just went thru this transition.
While my Cary amp was in the shop, I ran across an inexpensive
pair of pass diy monoblocks so i bought them as a filler.
They are a whopping 7wpc of pure class A. I immediately knew I
was either a monoblock guy or class a guy as they sound was
so much more detailed -I had to have it.
My Tannoy speakers are rated 94 sensitivity and even so at full volume
you did not need to leave the room.
So yes they are underpowered for a large room or orchestral music.
I have worn out ears and do not listen loud anymore- 75db max.
I sold the Cary and bought a 25wpc class a amp that I am breaking in
as i type. Not missing the tubes. I may buy a tube preamp though.
Your horn klipsch speakers may get a bright with all class a. The right
cables would likely overcome that. Good luck!!

I’m very please for great response from everyone thanks appreciated 
after reading all the comments and suggestions  I have decide to separate my 2 channel from home theater  
now my new preamp Michi P5 is class A design well I don’t know much about class a preamps I just love the looks lol
I think passlab XA25 first Watts J2 Shiit Aegir and some monoblocks are in consideration I need to read more 

"...first 6 watts is pure class A sounds really good I’m just wondering what I’m missing i guess I need more class A..."

With speakers @ 102dB efficiency, of course depending on your room size, I suspect most if not all of your listening is within the class A envelope.  

I could live with a Rogue Aidio Cronus Magnum III, it is quite nice. If you haven’t owned tubes, I recommend the experience. If, like me, you are married, have lived with tubes for decades, and are over having to buy new power tubes (especially, pre tubes are less of a pain), and losing resolution to noise, get a Luxman 550AX II and be done with it.

... my new preamp Michi P5 is class A design

@glennewdick makes an excellent point about usable volume control range. And that is a particularly important consideration in this case because the Rotel Michi P5 preamp has high gain. According to my calculations its gain is at least 16 db, and it may be considerably more than that depending on the combination of RCA and/or XLR inputs and outputs that are used. But even 16 db is well above average for the gain of a line stage.

Power amp gains generally tend to be in the area of 25 to 30 db. Your A21+, for example, has a specified gain of 29 db. But given the high gain of the preamp and the high efficiency of the speaker I think it would be prudent to avoid power amps having gains of more than about 20 db. (The gain of the XA25, btw, is 20 db; many of the First Watt amps have gains that are significantly less than that, which would be fine in this case).

Power amp gains are often not specified, but they can be calculated to a good approximation from the sensitivity spec that is usually provided, in combination with the specified maximum power ratings. Online calculators may be available for that purpose, or you can post back if you’d like to me to described how to do that calculation manually.

Finally, btw, virtually all preamps (and other line-level or phono-level analog components) operate in class A, even though some manufacturers trumpet that as a selling point.

Good luck. Regards,
-- Al