How much, if at all, does the output transformer of a tube amp contribute to the ideal, classic electric guitar distortion/overdrive/sustain effect? I'm considering building a completely custom combo amp with custom vertically offset bipolar speaker. The unlikely goal is something below about 35 lbs providing both a dead-quiet pure/clean tone (sounding like the best, most delicate, cost no object acoustic nylon and steel string guitars only louder) and similarly superb distortion/overdrive effects for electric guitar. Though no amp has achieved this lofty goal I'm quite the dreamer and have achieved some milestones in the past. Starting with the preamp: Do we all agree that a properly designed tube preamp is ideal, and the best SS is a far distant second, for the above-described electric guitar effect? Please correct if necessary. I'm consulting with the best tube designer/engineer I’ve met to see if one tube preamp could fill both the above-described acoustic and electric requirements. 2nd choice is a 2-ch preamp: Ch1 for clean/acoustic (tube or SS), Ch2 for electric guitar distortion/overdrive/sustain (tube only). Power amp architecture: The power amp architecture can only be selected after confirming to what extent the output transformer of a tube amp contributes (or does not contribute) to the ideal electric guitar distortion/overdrive/sustain effect. Recently a reliable industry source described a special Mesa Boogie tube power amp with dual output transformers (or possibly one transformer with dual primary and/or secondary taps). The industry source said the MB user could switch between either one or two output transformers (or taps) depending on the desired distortion effect. If the tube preamp can supply all the requisite distortion effects, I lean toward an OTL (output transformer less) tube power amp. This is because, compared to SS (and contrary to street logic), OTL can provide a lower bass cutoff when driving a high impedance speaker load such as in my case (custom vertically offset bipolar system, 2x 8 Ohm wired in series for 16 Ohm). Also, when matched to the right load, OTL is in a singular class of one when amplifying acoustic guitar, blissful magic otherwise unknown and unknowable.