Ocellia speakers and power

I use an 8 watt SOUGA amp and find it fine, listen in a large room and sometimes at very loud levels.

If you go to the PHY website it has all of the info you need. The "admissible" power rating was fairly low, at around 50 watts. The sensitivity - depending on the driver used, is 97 to 98 Db, I assume for the usual 1 watt at one meter. Given that and what appeared to be a very friendly impedance curve this speaker looks like a dream speaker for any S.E.T amp that you like.
As an aside, from the graphs these wideband single drivers drops off very steeply above 10K Hz and it also drops out below 50 Hz.
None the less I imagine your speaker will sound fantastic with a good tube amp of virtually any power rating.
I apologize for waxing poetic but I just read a 6 Moons article about PHY.
BTW What is a SOUGA amp?

Mechans,
I understand your waxing poetic, the PHY-HP 12 inch driver really seems like a quite special unit. I hope to hear some version of it (Tonian Lab perhaps) at the RMAF this year. I also read that 6 Moons PHY article, fascinating story. It was made with the goal of reproducing pure and natural musical beauty.

A SOUGA is a Kondo 2A3 amp with silver hand-wound transformers.

I have owned Tonian speakers for years and agree with the above posts....the phy will sound great with any good low to medium power tube amp. I find they like a little more juice than you can get from a 45 or 2a3 set will sound better with the 8 or so watts you can get from a 300b set and better yet from an 845 or 211 set. Otls like Ralphs work well.
A pair of audiopax model 30s were a very nice match.
Interestingly, Tony advocates for SS amps with the Tonians using the PHY and he likes the Stellovox, goldmunds srm and first watt J2 to name a few.
My favorite matches ended up being a pair of 20 watt 3dimension audio PP 300b amps and a Berning ZH230 @ 30 watts