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Old 16th May 2006, 05:36 PM   #1
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Join Date: Dec 2004
Location: Portugal
Default increasing Iq in Arcam Alpha 9 integrated amplifier

Arcam Alpha 9 uses a Auto-bias circuit.

Does anyone have already made this? Knows how can it be done?

Arcam excels in their service to customers : they sent me the schematics.

I'm just a bit confused about how can it be done.

Thank you ...
Joćo Corvo
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Old 25th November 2009, 06:39 PM   #2
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Join Date: Mar 2004
Location: UK

Did you ever figure this out ? The bias is set through the ltp current sink. In standard configuration the bias servo adjusts the bias between 473uA and 752uA. 779uA gives 250mA through the FETs. So to adjust the bias change R80/R81 , R180/R181.

I'm currently wondering whether changing the output to a CF output stage using lateral mosfets is worthwhile ...

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