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).
mitch4t
Typically tube amps maintain the same power output at all impedences. It doesn't double or halve as you go up and down as can happen with high current ss amps.
When a speaker dips to 1 or 2 ohms...does a tube amp such as the ARC 500 wpc model listed above begin to strain?.... or do they hold steady and maintain authority over the speaker?
I wouldn't recommend using a tube amp for speakers that dip to 1 or 2 ohms. That is enough of a struggle for a well built SS amp. A speaker with a nominal impedence of 4 ohms, with a dip down to about 3 ohms is about as much as you can expect from a tube amp.