I have the Tube Magician. I like it. It has some very cool uses. BUT it doesn't "warm" stuff up. (whatever that is...) Anyway it is more like a slight aural excitment thing going on. This is from some forum somewhere......
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Ran it through the Audio Precision System One to test. This box ups the THD from about .1% to around 1/2 % as you rotate the front panel knob. It also does a top lift of +6 db centered at 22k Hz. So, it's a top boost/aural exciter.
That pretty much summs it up. From that same post from god knows where:
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I replaced the upc4580 S08 opamps with LM6172's, changed out the coupling caps and added high voltage film bypasses. The chinese tubes were replaced with the EH telefunken knock-offs. It has nice meters and a big toroidal power transformer with a bottom mounted fan??? Leave space under it if placed in a rack.
(I cut and paste that info a long time ago and have it saved as a text file....I wish I could give credit to who wrote it.........It was NOT me!!)
I have not done the mods yet. I am looking for someone to do it. Removing the op-amps looks like it could be a pain in the butt. Anyway, I like it. Good results on Overheads, side snare, female vox and acoustic guitar. Tried it on bass but it thinned the lows a bit. Changing the caps and the op-amp might help? Used it on a really muddy mix once and it actually helped. Fun little flavor box....
Hope that helps........