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Old 25th May 2004, 10:28 PM   #1
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Exclamation magnetic

Aparently, Carver make a 900W "magnetic field" amplifier.
WTF?????????
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Old 25th May 2004, 10:50 PM   #2
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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.

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Old 25th May 2004, 11:00 PM   #3
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So, not a "Metal oxide Silicon magnetic field effect transistor"
Thought It might be a synthetic "woolinessŁ like an optical compressor.
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Old 26th May 2004, 10:45 AM   #4
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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.
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Old 26th May 2004, 10:59 AM   #5
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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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Old 26th May 2004, 12:10 PM   #6
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The Carver amps with the triac are a very poor choice for limited mains power.
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Old 26th May 2004, 12:14 PM   #7
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Quote:
The Carver amps with the triac are a very poor choice for limited mains power.
These are a typical case of handing a problem over to someone else !

I own a PM1500 that is used for a small PA every now and then. It doesn't sound that bad but other PA amps are definitely better.

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