The Rudistor amp is a pure SS. Its difficult, if not impossible, to compare that with a tube amp. None the less, amplification wise I would say the Sunrise is close to the Rudistor, even with stock PSU. But even though the Sunrise is very very good, it has the limitations of tube, meaning a tad less details/resolution compared to solid state. It is also a little more laid back and spatial presentation and air is a bit less. But the trade here is what you gain in organic sound and musicality. The Rudistor/PS Audio DAC is an extremly sweet combination, but the Rudistor does sound a bit "flatter" and less organic, and less bass. In short, what the Sunrise looses in resolution, clarity and details it gives you back in musicality and realism. These differences is not something that a amp designer will ever be able to solve, it is the limitations/tradeoff of a 60 year old technology: the vacuum tube!
So point still sticks, if you like valve sound, it is good enough to get a Sunrise amp and stick with it for life, it really does stand up to multi $ amp, which shows just how much hype it is around "head-fi". If you dont fancy tubes, then dont get it, but remember, you wont get a much better tube amp for any price, only different. Get a design based on transformers and you feel like you get a "blacker background", but what you get is lower resolution and the added coloration of the transformers.
The general user on this forum will not be able to hear that much difference between the Project Sunrise and the Rudistor even though they have quite different designs. But the limitations of the Project Sunrise vs the Rudistor amp, is the general tube limitations which plague all tube amps, and that limitation exist no matter which tube you use, I tried Reflector, Mullard gold-pin and Siemens 6922(tesla) NOS in this test.
All the best. K
P.S. The Sennheiser HD 600 on this Rudistor/PS Audio setup sounds more amazing than anything before it and it is on par with the Ultrasone ed 9. The Sennheiser 600/650 are known to scale well, and they really do. With the Rudistor the Senn HD 600 gets the soundstage of the AKG K 701. Bad amping is what has given the Senn HD 600/650 of "closed" and "dark" sounding headphones.