Adjusting Bias on M amps

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Fugl_Soundrides.dk
Posts: 2
Joined: Wed Jul 17, 2013 4:26 am

Adjusting Bias on M amps

Post by Fugl_Soundrides.dk »

Hi all.

do anyone know where to measure the bias of the m25, m44, m50 and m100 amps? and where do you adjust it?

replyes with pics is much appreciated :)

Best regards from Denmark :)
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rolandk
Posts: 238
Joined: Thu Jan 04, 2007 8:36 am
Location: Portland, Oregon

Re: Adjusting Bias on M amps

Post by rolandk »

Measure voltage across the output emitter resistors (the big ones near the output transistors) and adjust the yellow trim pots to 50-100uV (not mV). Make sure the amp is cold and no input signal or load connected.
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