In all the years I have been recording I have yet to get any real usable main tones from a preamp direct out on guitar rigs. Bass amps are another thing and designed more for this. However, as a filler tone you can usually get rid of the buzz from a 1/4 direct by going into a DI box that changes the impedance over to the XLR level and then send that to a good pre-amp into your recording studio.
Nine times out of ten that will fix your buzz. Even if the 1/4 jack is a balanced the transformers in a DI box seem to cause the buzz to dissappear. I would try that first but to tell you the truth nothing compares to the Eggy moving real air through a speaker for your main bed tracks and solo's.
For a killer recording a DI from the pre-amp would never be anything more than an additional track to mix in under the main tone of that amp breathing naturally through the speakers. The Eggy's sound so good with a simple sm57 in front of them it is just killer. Add and X/Y setup with an SM57 and some other condensor mic like an AT3030 or the likes and wow will that thing track like a monster for you.
Blend in the DI solution to taste and it will be a freaking wall of guitar that will be hard to beat. Hope this helps anyone tracking guitar.