Recent content by MilbertCom

ZOTL actually has nothing to do with traditional OTL beyond similar acronym. Traditional OTL paralleled numerous tubes to reduce output impedance. ZOTL uses 4 output tubes for 90 watts and performs its magic completely differently. So, prejudge based on anonymous IMHO's or listen for...

That would seem to describe a digital hybrid type amplifier, in which tubes perform some function, and then the signal is forwarded to a class-D power output stage which then provides audio power amplification to the speaker. There seems to be limited sonic zen in this method, as many have...

Some apparently do 'hear' with their eyes and knee-jerk. But those who play GAGA respond positively -- "three dimensional", "organic", "bottomless", "headroom on the bottom", etc.

Years ago at a winter CES show, the guys from Phoenix Gold hid one of their SS car amps in a big, presumably tube-driven 'audiophile-type' chassis which was sitting between big speakers in one of the home-audio demo suites in the "high-end" hotel of the show. They periodically sat a group of...

Just curious, how much do those speakers weigh, each?

Berning's Quadrature Z amp is not class D. It, like other Berning amps and also the Milbert GAGA-50 guitar amp, uses patented ZOTL technology. http://davidberning.com/technology covers the patents/white papers, and http://milbert.com/gaga#newkind addresses some specific questions.