I have a tube amp question?????

A friend of mine uses a 17 watt/channel tube amp to drive very inefficient speakers. He knows this but they sound so good at low volume that he can't bear not using this amp. If the amp you have your eye on is a real steal and you can afford it, go for it. At some time in the future it may be great as a tweeter amp in a biamped system.

Elgordo offers sage advise.

You certainly aren't going to rock the house with this amp, but if that was your interest--you probably wouldn't be looking at this amp anyway. If you are in a moderate sized room and listen reasonably close (less than 10 feet--I don't know if your room or speakers are conducive to that setup), you will probably be so engaged by the tube amp, that I doubt you will be looking for more volume. The only other aspect I would consider is the ohm (loading) of the speaker. I know you said 6 ohms, but that's nominal. You might want to be sure that it doesn't dip to some very low impedance in certain instances. That can create some difficulties for some tube (and other) amps.

I once owned a 30 watt tube amp that I used to drive Vandersteen 2c's (88db) in a 12 by 26 room. It occaisionally clipped and distorted so I would think that 12 watts would not be enough, however this is only my opinion.

I doubt that 12 watts into the given speaker load you described would be very satisfying. If I couldn't audition I wouldn't do it.