I suppose I ought to respond to that one.
The ZERO is an autoformer- the simplest type of transformer available. It has only one winding and does not block DC. Additionally, its turns ratio is exceptionally low, as the translation in impedance is typically from 4 ohms to 16 ohms.
The combination of these factors allows the device to have wider bandwidth then most transistor amplifiers- something in the neighboorhood of 2Hz to 2MHz.
A transformer like this is not normally possible with a conventional tube amplifier. Most output transformers (i.e. most tube amps) have trouble with four ohms and less anyway- the reduction in performance is easily measured and heard. The ZERO offers a bona-fide method of overcoming the four ohm problem, and has found application with many transformer coupled tube amplifiers as well as OTLs...
The ZERO is an autoformer- the simplest type of transformer available. It has only one winding and does not block DC. Additionally, its turns ratio is exceptionally low, as the translation in impedance is typically from 4 ohms to 16 ohms.
The combination of these factors allows the device to have wider bandwidth then most transistor amplifiers- something in the neighboorhood of 2Hz to 2MHz.
A transformer like this is not normally possible with a conventional tube amplifier. Most output transformers (i.e. most tube amps) have trouble with four ohms and less anyway- the reduction in performance is easily measured and heard. The ZERO offers a bona-fide method of overcoming the four ohm problem, and has found application with many transformer coupled tube amplifiers as well as OTLs...