Power amp for Silverline Sonata III

I have heard the big quicksilver 135's and they are extremely well built and totally classic tube in all the good ways. I'm told the V4's also give you excellent build quality and similar, albeit less power, classic tube sound as well. The Sonatas really seem to appreciate pure tube... (not that they can't rock hard with good SS) and the flexibility of those V4's really could be fun/exciting/satisfying... I happen to like the EL 34's but it sure would be nice to try the KT88's or 6550's, etc. for a whole different effect. While I can't attest to bi-amping, I will highly recommend bi-wiring as it brings even more detail and definition without ever being fatiguing or overly etched. In fact, the Sonatas are very easy to listen to extendedly with good ancillaries.

Sonicnirvana,
My impression of the difference biamping made is the music was "tighter" the soundstage was more defined, there is more "intensity" in the voices. All of the things that made me happy the ex is gone and no one tells me my speakers are too big, the music is too loud or you spent too much.
Everyone would use different words in describing the difference in sound.

Sonicnirvana,
Forgot the rest of your question. I have no idea what happens inside the speaker so I don't know about the specific cross-over frequenies.

Thanks especially to Yohjo and Lissner.
My ex is gone too!

4 times V4 monoblocks would be a bit much......for the price I think simply a higher-end power amp may be a better investment......I like the look of the V4s though as a versatile choice.

I was really looking for something "so nice" in a 40-50 watt but it seems there is this gap between SETs and big push-pulls. The bigger Audio Arts look nice but well out of my price range.
The atma-spheres look interesting but I see the match with OTLs a bit of a risk withoout trying first and there is no local dealer.....

I am using a VTL Stereo 150 moddified with oil filled caps and NOS tubes. The sound is extrordinary, silky smooth clean highs, transparant mids and surprising, a tight bass.