i sold my e530 a week or so ago!
it's veeeeery brutal, but it looses completely character when played through a solid state poweramp, and i think that's what happens to every single tube pre... tube sound is mainly created by power tubes... pre circuitry just affects the amount of gain and the equalization, but any tube preamp will sound just like a distortion pedal if put before a SS amp, and possibly even fuzzier than a solid state distortion, because of the higher output gain. direct registration is unthinkable. for that you have to use a simple, cheap emulator with way better results... valves are chic (and are absolutely unreachable in live situations), but don't stick on them when you can get more from digital technology!