Amp and speaker matching.

I have driven my Maggie 3.6's (86db 4ohms)with my VTL ST-85 in triode mode which is 40 watts with no problem. It is hard to answer your question unless you try the combination or someone here has tried it
Alan

The answer is definitely maybe. Yes, your Danes lower sensitivity is an issue. If 3.4 ohms is their low point, that's not too much of a concern since most tube amps have 4 ohm taps as well as 8 ohm taps. Bigger questions are about the size of the room and how loud you like to listen. Remember, 86 db means that you will generate a SPL of 86 db at 1 meter with 1 watt of power. That means 10 watts will generate 96 db. 10 db = twice as loud, so 96 db is twice as loud as 86 db. However, the farther you are (from 1 meter) from the speakers, and or the bigger the room, that 86 db rating will drop. How lively (reflective) the room is will also factor into the equation.

So the only real answer is to try for yourself. See if you can borrow a tube amp for demo. Do you have any local audiophile friends or dealers who may be able to assist you here?

My gut feel is that you should be fine, unless you are in a very large room and/or listen at very high levels. Most of us don't use nearly as much power as we think we do. You are probably using less than 10 watts of your 350 watt amp now.

When someone asks if a cetain type of amplifier will drive their speaker I am assuming they want to know if the amplifier will drive their speaker properly. I have tried many combinations like driving Maggies with 15 watt Quad tube monos and driving the giant Duntech Sovereigns with a 14 watt single ended amp. Although I was able to play music through these speaker with these tiny amplifiers the speakers did not sound their best. Simple music is ok, but on complex large scale music at high volume, forget it.
Stereophiles favorable review of the Dynaudio Contour 3.0 was with amplifiers like Bryston 4B-ST, Bryston 7B-ST monoblocks and Levinson 331.

Rrog is spot on. The 70 watt tube amp will work and produce nice sound, but the power reserves and headroom will not be there for complex and demanding material at higher volumes. The speakers will not sound as good as they could as they will be dynamically limited in respect to your current amp.

HI Grannyring,
It`s hard to know sometimes,I suspect it depends on the particular tube amplifier. Two amps with the same power rating can in reality be night and day different(transformer,power supply robustness etc.). Jerroot and Ard`s experiences suggest they got great results rather than merely adequate compromise.