I forgot to mention I used some modelling amps before, a few of them I'm still using (Peavey Vypyr, Line 6), but I think it's not the real thing.
The nutube approach I think, will not be not the same as real tubes because lower gain per stage and lower anode voltage. You could also use one normal tube with lets say 50-60V anode voltage. Gain will be lower then automatically. So I do not see much advantage for the nutube beside power dissipation and dimensions (volume). 

Quote from: Katoda on January 11, 2016, 12:09:36 PM
Hi,
I didn't have a proper mic so I just turned the volume waaay down until the phone mic wasn't clipping and recorded a sample of the cleanup with the guitar volume knob.
https://soundcloud.com/user-119965807/evh-5150-preamp-phone-recording-of-guitar-volume-cleanup
Gain was on 11 o'clock, on the recording I gradually increase the guitar volume.

EDIT: Listening to it again, the gain was set kinda high, metal territory...

That sounds great in my ears!
What final amp did you use? That TDA2030 or your Fryette?

Hi,
I like the sound of 5150/6505, SLO100, hot rodded marshalls and similar tube amps, but I don't like all the tube typical disadvantages (heat, wearing, microphony, weight, costs, high voltage...).
So I am looking for solid state alternatives to tube amps and found some interesting circuits using depletion MOSFETs (LND150) by KMG and others.
I'm not quite sure if I need a tube or tube emulating FET output stage using a big output transformer to get that overdriven sound by the output stage, or if same or similar sound could be generated in the pre amp section. If possible I'd like to use a "normal" transformerless transistor final stage to get rid of the weighty and expensive output transformer. I'd also want to get rid of higher voltages >>60-100V.
Does anybody know if there's a chance?
I'm electronic technician, but I'm not an electronic developer, so I need a little help by the amp experts here...