Is there any reason not to have tube phono stage ?

Highly dependent upon the cartridge and on whether or not you use a SUT with low output cartridges. One can’t answer those questions for you. For high output cartridges I would use tubes, and I’m on record to say that paying big bucks for NOS tubes is overrated although you do want to select tubes that are operating within spec as described in the RCA tube manual. As to matching sections of dual triodes, that too is pointless if the circuit is single ended where typically only one of the two sections is in use. But can be important for balanced operation.

@knotscott 

My 3rd favorite Phono stage is also tubes, my friend’s Hagerman Tube Cornet 2, he brought it here, it sounded great, and I’ve heard it many times at his home thru my old JSE Infinite Slope Model 2 speakers that my son gave him and he restored.

He runs it into a deHavilland Tube Preamp, to a SS McIntosh beast.

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Project Tube Box 2. I hate to admit it, because I hate it’s bottom jumpers, but it sounded darn good, and I studied the settings, so he could use the same jumper 1 on for capacitance, and only turn jumper 8 ON for his LOMC, jumper 8 OFF for MM.

It is a lot of flexibility for not a lot of money, why not trust us and put them right on the front or top, and add a real ON/OFF switch rather than need to unplug it’s power supply.

over time i moved away from high gain tube phono amps... too finicky and troublesome over the long term

there are truly excellent ss phono stages that i use -- lehmann decade and ayre are two that are my go-to’s (sutherlands are very fine too, though lower in gain)

if i want tubey goodness in the chain i use my c-j or arc linestage

I use a tube Herron Audio phono stage myself, but I wouldn't expect everybody to like the same sound that I do, and some folks might just prefer SS and what it can bring to the party. 

correction, I misread, they need a space after the last zero, before the word ohm, we want 100 ohms, that’s jumper 7 not 8

Project Tube Box 2. I hate to admit it, because I hate it’s bottom jumpers, but it sounded darn good, and I studied the settings, so he could use the same jumper 1 on for capacitance, and only turn jumper 7 ON for his LOMC, jumper 7 OFF for MM.