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Old 8th December 2008, 04:38 PM   #1
h_a is offline h_a  Europe
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Default Krell's sustained plateau sliding bias

Hi all,

Krell says it's patented - so does somebody has a patent number for it? I can't find anything on the patent website.*

A schematic would also do ;-))

Have fun, Hannes

* "Domestic electric weight balance with lacquered panel" does not count
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Old 8th December 2008, 05:54 PM   #2
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1992 version of Sustained Plateau Bias Krell is patent (5,331,291) which includes basic sense circuits

Latest Krells use a microprocessor plus sensors for both output current and output temperature to selectively switch-in parallel lower value resistors in the bias adjustment circuit.

Google patents will allow you to get a pdf.

For my DIY Class-A amps I include a microswitch on the PCB with a mechanical push rod going to the rear panel which allows me to set two bias points by switching in a lower value parallel resistor in the bias circult. Two bias points seems to fit my listening needs, and the bias never changes during the music.
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Old 9th December 2008, 04:31 PM   #3
h_a is offline h_a  Europe
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Thanks for the patent #!

Great, I already thought before that it's going to be complicated

But hey, microprocessor controlled bias sounds like a nice idea!

Have fun, Hannes
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