magnetic

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I'd assume this means rail voltage is modulated by a switch mode
type supply, different to their previous simple diode rail switching.

As a SMS needs a output toroid the "magnetic field" connection
is there but as you imply its a rather tenuous description.

:) sreten.,
 
Carver's original magnetic field amplifier was a switching supply tracking the audio signal. He could not get it to work (25 years ago) on a production basis with available parts.

What he did do is interesting (but does not meet agency aproval for new designs). He went to a tiered power supply ±37V, ±75V, ±125V with virtually no filter capacitance, a single pair of 3,400µF for each tier of his stereo 600W per channel unit. The power transformer was triac phase controlled over a very narrow conduction angle, and was only about 1/4~1/6th the size seen in a 'normal' design.

This describes a PM1.5, the PM2.0 was basically the same with a full switching supply, and the weight dropped from 16 lbs to 10 lbs. A PM2.0 if it was power factor corrected would meet agency aproval.
 
I recall a situation where a radio station used a few of these Carver amplifiers in their mobile studio. They were powering some really big but not too efficient loudspeakers.
When they ran the system on generator power, the generator would "bog down" and sometimes stall when the music was bass-heavy.
They replaced the amplifiers with something a little more traditional.
 
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