Is there any way of getting a natural distorted tube sound from a all tube amp (ie Epi Valve Junior) without cranking the volume? This is without the use of pedals as well.

Yeah, an attenuator, but if the speaker is designed to break up, it won't have the same effect as cranking it will.. An attenuator would be the safest bet, unless you want to make some mods to it and most likely void your warranty..
Attenuator is the only way I think. Well, for poweramp distortion anyway. Any master volume tube amp will you give "natural tube distortion" from the preamp when you turn the gain up.
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