Viva or Mastersound?

I would wholly concur with Cousingermain.I have Mastersound 845 Monoblocks with Mastersound PH5 Preamp and Kondo SPC cables and this lot slams out the bass with brilliant clarity and soundstage.There is nothing whatsoever coloured or slow about it.The speakers are ART Noveau.I have not heard Vista so it would be wrong of me to pass any comment.
After all it is down to what your ears hear ast the end of the day,good luck in your quest

The Solista uses 6C45p for the input tubes. Does anyone know of other tubes that could be used in this position? It seems like russian tubes are the only option?

I prefer Visa but also have Mastercard. I don't like AMEX though. Wait, my bad, that's totally not what you asked about. Disregard.

Tpreaves -

Thanks for nothing