Aronov LS960I is another choice, sounding "real" and musical at the same time, accompanied by marvelous bass detail, texture, and extension. No adjustments, or requirement for tweaking. But, any unit one purchases can benefit from proper choice of power cord, underlying support decision, and power directly from the wall.
Alternative tube choices ("tube rolling") can sometimes enhance tubeaholic listening pleasure, but which replacement tubes are the "best" for the unit your friend ends up choosing can be a separate subject for debate.