Balanced vs RCA preamps

I use Ayre equipment.....all the components even the phono are balanced

Ayre is all solid state, no tubes.  The OP wants balanced and rca on a tube preamp. 

My Linear Tube Audio MicroZOTL tube preamp has one balanced input. The rest are unbalanced.  I asked LTA if there was any benefit to using the balanced input. They said it would depend on the strengths of the connected device. My dac has both balanced and unbalanced outputs. 

I'm using unbalanced because my best cables are unbalanced. 

For me it was more about flexibility. I like having both because not all power amps have both. Also, I'm thinking about getting some high-end active powered speakers. I can use my existing preamp to switch between my powered speakers and passive speakers between both sets of speakers without changing cables. Balanced cables are supposed to have a lower noise floor especially for longer runs but I think in reality it doesn't matter that much for the average audiophile.

When using XLR connectors be aware that Japanese audio manufacturers use a different configuration for pin for ground.  

So if using say a US made pre-amp with a Japanese amp you need to make sure they are using the same pins for ground.  Accuphase amps have a selector for this.