Hafler 9505- Bias adjustment - diyAudio
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Old 16th June 2012, 04:15 PM   #1
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Join Date: May 2004
Location: Indianapolis. In
Default Hafler 9505- Bias adjustment

I'm going to be replacing two output MOS-FETs in my left channel(Q48/Q52), with Hitachi devices. Will I need to re-bias the outputs in that channel? If so- a little guidance, please.
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Old 16th June 2012, 11:37 PM   #2
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Join Date: May 2004
Location: Indianapolis. In
OK- I needed to search a bit farther online. Got my answer! To adjust the bias, disconnect the input and speakers and remove
the B+ fuse for that channel. Connect an amp meter across the now vacant fuse clips and adjust R45 (R145 for the left
channel) to get a current reading of 300mA for the 9303, 400mA for the 9505.
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