25 Watt Tube Amp for 90db Speakers?

NOT enough....I have jolida 40 watts amp. I tried it to my snell type D. Hard to drive.

I tried my snell type D to the 60 watts BAT VK60 and it is awesome.

I suggest you to get a used BAT VK60. You wont regret it.

25 watts is fine. Snell originally spec'd them for amps as low as 15 watts. Would more watts be wasted, no, but 25 is sufficient to extract high quality performance from the Snells.