Just find a tube unit from the early 1960s and put in some worn out tubes. Get as much distortion as you can. That will make it sound "tubey." Great, fat, bloated, lacking transparency like trying to read fine print through a layer of mud while wearing a welder's mask.
Otherwise, buy a modern neutral tube preamp and enjoy the quality of fine musical reproduction that well-designed tube equipment can deliver.
Otherwise, buy a modern neutral tube preamp and enjoy the quality of fine musical reproduction that well-designed tube equipment can deliver.