Tube amplifiers that really drive MBL 101E's

I'm currently using a pair of Atma-Sphere MA-2 mkIIIs.
They are best I've heard so far with my 101Es.

Exlibris.
We are have been designing and currently building a pair of mono blocks with the intention of having great capabilities of driving MBL's, these will be 250 watts per channel, 450 watt peak, the first pair will be delivered to vetterone shortly.
These amps will have much improved ZH technology, along with new inventions.

Allan

Berning Co

Hi Allan,
Congratulations on the new amps!
Do you know if vetterone has tried the big Atmas or the big Joules with his 111s?

I'm not sure if he's tried those other amps, I know he's tried the big MBL amps, Krell and many other solid state amps, I would think the impedance swing on these speakers would give some regular OTL's a challenge, especially for accuracy.

As well, the ease of use and maintenance, low heat, long tube life is something that vetterone is use too.

My understanding is that the MBL 101E presents a pretty flat 4 ohm impedance curve. It dips just below 4 ohms in the midrange and then rises in the lowest frequencies (good for OTLs).
There aren't any big impedance swings on the graphs that I've seen.
The Atma-Spheres are incredibly easy to use and they are bullet-proof. Heat can, however, be a concern.