Walcott amps are good for these kinds of loads they work well with electrostatic speakers also
Tube amps and low impedances
Audio Research lists its flagship Reference 600 amp at 500 wpc at 16 ohms....Do tube amps double with each halving of impedance as the best solid state amps do?
Model Reference 600MKIII Specifications
POWER OUTPUT: 500 watts continuous at 16 ohms from 20Hz to 20kHz with less than 1% total harmonic distortion (typically less than .05% at 1 watt).
Model Reference 600MKIII Specifications
POWER OUTPUT: 500 watts continuous at 16 ohms from 20Hz to 20kHz with less than 1% total harmonic distortion (typically less than .05% at 1 watt).